Manual Part No. C7096-90967 *C7096-90967* *C7096-90967* Printed on Recycled Paper C7096-90967 HP Color LaserJet 8500/8550 Printer Family Service Manual Copyright© 2000 Hewlett-Packard Co.
HP Color LaserJet 8500/8550 Printer Family Service Manual
Copyright Information Warranty Trademark Credits © 2000 Hewlett-Packard Company The information contained in this document is subject to change without notice. CompuServe™ is a U.S. trademark of CompuServe, Inc. All Rights Reserved. Reproduction, adaptations, or translation without prior written permission is prohibited except as allowed under copyright laws.
Table of Contents 1 Product information Chapter contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 Printer features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24 Site requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Printer maintenance Chapter contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .111 Cleaning procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .113 Printer consumables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .118 5 Theory of operation Chapter contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .133 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting Chapter contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .363 Pre-troubleshooting checklist . . . . . . . . . . . . . . . . . . . . . . . . . . .367 Printer message troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . .368 Aids to troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .415 Paper path troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . .433 Image formation troubleshooting. . . . . . . . . .
6 Contents EN
List of Figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Figure 12. Figure 13. Figure 14. Figure 15. Figure 16. Figure 17. Figure 18. Figure 19. Figure 20. Figure 21. Figure 22. Figure 23. Figure 24. Figure 25. Figure 26. Figure 27. Figure 28. Figure 29. Figure 30. Figure 31. Figure 32. Figure 33. Figure 34. Figure 35. Figure 36. EN Space requirements . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 37. Figure 38. Figure 39. Figure 40. Figure 41. Figure 42. Figure 43. Figure 44. Figure 45. Figure 46. Figure 47. Figure 48. Figure 49. Figure 50. Figure 51. Figure 52. Figure 53. Figure 54. Figure 55. Figure 56. Figure 57. Figure 58. Figure 59. Figure 60. Figure 61. Figure 62. Figure 63. Figure 64. Figure 65. Figure 66. Figure 67. Figure 68. Figure 69. Figure 70. Figure 71. Figure 72. Figure 73. Figure 74. 8 List of Figures Waste toner level detection . . . . . . . . . . . . . . . . . .
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Figure 283. 3,000-sheet stapler/stacker components (1 of 2) . . 570 Figure 284. 3,000-sheet stapler/stacker components (2 of 2) . .
List of Tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Table 12. Table 13. Table 14. Table 15. Table 16. Table 17. Table 18. Table 19. Table 20. Table 21. Table 22. Table 23. Table 24. Table 25. Table 26. Table 27. Table 28. Table 29. Table 30. Table 31. Table 32. Table 33. Table 34. Table 35. Table 36. Table 37. Table 38. EN Features and accessories by printer model . . . . . . . . 22 Printer performance . . . . . . . . . . . . . . . . . . . . .
Table 39. Paper-size detection switches. . . . . . . . . . . . . . . . . . 202 Table 40. Multi-bin mailbox sensors, switches, motors, and controller board PCA . . . . . . . . . . . . . . . . . . . . . 209 Table 41. Numbered printer messages . . . . . . . . . . . . . . . . . . . 368 Table 42. Unnumbered printer messages . . . . . . . . . . . . . . . . . 388 Table 43. Sensor monitor test . . . . . . . . . . . . . . . . . . . . . . . . . . 424 Table 44. Media jam detection . . . . . . . . . . . . . . . . . . .
Table 79. Table 80. Table 81. Table 82. Table 83. Table 84. Table 85. Table 86. Table 87. Table 88. Table 89. Table 90. Table 91. Table 92. EN Delivery assembly parts . . . . . . . . . . . . . . . . . . . . . . 553 Delivery cover assembly parts . . . . . . . . . . . . . . . . . 554 Transfer belt assembly parts . . . . . . . . . . . . . . . . . . . 555 Fuser assembly parts . . . . . . . . . . . . . . . . . . . . . . . . 558 PCA assembly parts . . . . . . . . . . . . . . . . . . . . . . . . .
18 List of Tables EN
1 Product information Chapter contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Printer features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . 24 Operating environment specifications . . . . . . . . . . . . . 24 Acoustic emission specifications . . . . . . . . . . . .
Printer Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 External views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Formatter assemblies . . . . . . . . . . . . . . . . . . . . . . . . . 43 Media-handling accessories and options . . . . . . . . . . 44 Safety information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 FCC regulations. . . . . . . . . . . . .
Introduction This manual covers service topics for the following printers and their paper-handling optional accessories: Note EN HP Color LaserJet 8500 printer (base model) HP Color LaserJet 8500 N printer HP Color LaserJet 8500 DN printer HP Color LaserJet 8550 printer (base model) HP Color LaserJet 8550 N printer HP Color LaserJet 8550 DN printer HP Color LaserJet 8550 GN printer HP Color LaserJet 8550 MFP—print engine only Service topics for the HP Color LaserJet 8550 MFP printer’s co
Printer features Table 1.
Table 2. Printer performance Print speeds 24 pages per minute (ppm) black and white (b/w) 6 ppm color Text and graphics resolution 600 dots per inch (dpi) resolution Letter and A4-size 24 ppm b/w; 6 ppm color Legal, Executive, and 11-by-17 inch size 12 ppm b/w; 3 ppm color Approximate print speeds Heavy paper Transparencies Fonts Printer personality support User interface and EIO 3.2 ppm b/w; 2.2 ppm color 2.6 ppm b/w; 2.
Specifications Electrical specifications Table 3. Electrical specifications Item 110-volt models 220-volt models Power requirements 100 to 127 V (+/- 10%) 50/60 Hz (+/- 2 Hz) 220 to 240 V (+/- 10%) 50/60 Hz (+/- 2 Hz) 750 W (average) 375 W (average) 190 W (average) less than 45 W less than 2 W 750 W (average) 375 W (average) 190 W (average) less than 45 W less than 2 W 12.0 A at 120 V 6.
Acoustic emission specifications Table 5. Acoustic emissions Category 8500 8550 Operation position (per ISO 9296, DIN 45635, T.19) Printing: LpA 54 dB(A) Standby: LpA 49 dB(A) LpA 57 dB(A) LpA 52 dB(A) Bystander 1 meter (per ISO 7779, DIN 45635, T.19) Printing: LpA 50 dB(A) Standby: LpA 45 dB(A) LpA 54 dB(A) LpA 47 dB(A) Sound power (per ISO 9296) Printing: 6.8 B (A) Standby: 6.3 B (A) 7.0 B (A) 6.4 B (A) Printer dimensions Table 6.
Consumable storage specifications The life of consumables is greatly affected by their storage environment. Use the following table to determine the shelf life of stored consumables. For consumable replacement specifications, see page 119. Table 7. Consumable storage specifications Temperature Normal (maximum of 2.
Site requirements General guidelines Locating and placing the printer correctly are important in maintaining the performance level set at the factory. In particular, be sure to adhere to the environmental specifications listed in this chapter. The following are recommendations for locating and placing the printer: EN Install in a well-ventilated, dust-free area. Do not expose the printer to direct sunlight, dust, open flames, or ammonia fumes.
Space requirements Note See the HP Color LaserJet 8550 MFP printer service manual for space requirements for the copy module, automatic document feeder, and 1,000-sheet input paper deck. 1404 mm 55 in 290 mm 11 in 1 1085 mm 43 in 460 mm 18 in 363 mm 14 in 495 mm 20 in 1230 mm 48 in 2 838 mm 33 in 495 mm 20 in 1230 mm 48 in 3 838 mm 33 in Figure 1.
Media requirements Selecting media Many types of paper and other print media can be used with the printer, within certain specifications. CAUTION Using media that do not meet the specifications outlined in this chapter can increase the incidence of media jams, contribute to repair and maintenance costs, and cause premature wear, print quality problems, and problems requiring service. This service might not be covered by the HP warranty or service agreements.
Storing media Follow these guidelines when stacking and storing media: Leave media in the wrapper until you are ready to use it. Keep stored media away from temperature and humidity extremes. Do not store cartons or reams directly on the floor where they will absorb humidity. Instead, place cartons on a pallet or on shelves. Do not store individual reams in any manner that causes them to curl or warp along the edges. Do not stack more than six cartons on top of each other.
Media capacity and sizes for input trays The following table lists the types and sizes of media supported by each input tray. For best results, use HP LaserJet paper or conventional white copier paper. The media should be of good quality and free of cuts, nicks, tears, spots, loose particles, dust, wrinkles, voids, perforations, and curled or bent edges. For a complete list of media specifications, see the HP LaserJet Printer Family Paper Specification Guide. Table 8.
Table 8. Media capacity and sizes for input trays (continued) 2,000-sheet input tray Tray 3 Tray 2 Tray Media type Media size and orientation Media weight Maximum capacity 500 sheets of 20 lb (75 g/m2) bond Paper Plain Preprinted Letterhead Prepunched Bond Recycled Color Glossy A4 (landscape) JIS B4 (portrait) Letter (landscape) Legal (portrait) 16 to 28 lb (60 to 105 g/m2) bond Transparency A4 (portrait) Letter (portrait) 5 mils (0.
Media capacity and sizes for the multi-bin mailbox The following table lists the types and sizes of media supported by multi-bin mailbox output bins. Table 9.
Printable area Print areas shown in the table below are defined as follows: Non-masked area—the maximum area in which image signals are not masked by the compulsory formation of blank image area (this is the maximum area that can be addressed by the laser beam). Recommended print area—the maximum area in which image signals can be printed on media without any loss of image signals, excluding manual feed.
Media considerations Note Not all media types are supported in all modes. Media for duplexer The duplexer accepts standard-sized media as large as A3 media. The duplexer accepts up to 28 lb (105 g/m2) bond. Envelopes CAUTION The Envelope media-type setting in the printer driver has been optimized for the best print adhesion for most envelopes. The Heavy Paper mode might also work well for some envelopes, especially if the printing environment humidity is low.
Glossy media If you want the effect of glossy media, use only HP LaserJet soft gloss media in this printer. HP soft gloss is the only glossy media supported by the printer. For ordering information, see page 513. Heavy paper stock Heavy paper stock is any paper from 28 lb to 58 lb (105 to 216 g/m2). Always print heavy paper stock from tray 1. In the printer driver, select Heavy Paper or Cardstock as the paper type on the paper tab to ensure the correct finish on the media.
Media to avoid To avoid poor print quality or damage to the printer, do not use any of the following: EN coated or embossed media media with cutouts or perforations (except prepunched paper) media that produce hazardous emissions, melt, offset, or discolor when heated to the printer’s fusing temperature (approximately 190° C, or 374° F) media that have already been through a photocopier or laser printer (even if there is no printing on the page) unless you use the “manual print seco
Identification (model and serial numbers) To identify the model number and serial number, find the label located on the rear of the printer, similar to the one shown in figure 2 (the example shown is from an HP Color LaserJet 8500 printer). (serial #) (model #) Figure 2.
Printer Information Configurations Available configurations for the HP Color LaserJet 8500 printer appear below; available configurations for the HP Color LaserJet 8550 printer are shown on the following page. The HP Color LaserJet 8500 printer is available in the following configurations: HP Color LaserJet 8500 The HP Color LaserJet 8500 comes standard with a 100-sheet tray 1, a 500-sheet tray 2, a 500-sheet tray 3, a printer stand, and 32 MB random-access memory (RAM).
The HP Color LaserJet 8550 printer is available in the following configurations: HP Color LaserJet 8550 The HP Color LaserJet 8550 comes standard with a 100-sheet tray 1, a 500-sheet tray 3, a printer stand, and 32 MB RAM. HP Color LaserJet 8550 N The HP Color LaserJet 8550N comes standard with a 100-sheet tray 1, a 500-sheet tray 2, a 500-sheet tray 3, a printer stand, 64 MB RAM, an HP JetDirect print server (10/100 Base-TX), and an internal hard disk.
External views 7 1 8 2 9 10 3 4 11 5 6 12 Figure 3.
3 1 4 2 5 Figure 4.
Formatter assemblies 2 3 4 5 1 6 7 Figure 5.
Media-handling accessories and options 1 9 2 3 4 5 6 7 8 Figure 6.
Table 11. Paper handling accessory status LEDs LED Flashing amber 2,000-sheet input unit Multi-bin mailbox Stapler/stacker The accessory has a media jam or a page needs to be removed from the 2,000-sheet input unit, even if the page is not jammed. The accessory has a media jam or a page needs to be removed from the multi-bin mailbox, even if the page is not jammed. The accessory has a media jam or a staple jam, or one or more bins are full. The vertical transfer unit (VTU) might be open.
Safety information FCC regulations This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the U.S. Federal Communications Commission (FCC) rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
Declarations of conformity DOC—HP Color LaserJet 8500 printer DECLARATION OF CONFORMITY according to ISO/IEC Guide 22 and EN 45014 Manufacturer’s Name: Manufacturer’s Address: Hewlett-Packard Company 11311 Chinden Boulevard Boise, Idaho 83714-1021, USA declares, that the product Product Name: Model Number: Product Options: HP Color LaserJet 8500, 8500 N, 8500 DN C3983A, C3984A, C3985A ALL conforms to the following Product Specifications: Safety: IEC 950:1991+A1+A2+A3+A4 / EN 60950:1992+A1+A2+A3+A4 IEC 8
DOC—HP Color LaserJet 8550 printer DECLARATION OF CONFORMITY according to ISO/IEC Guide 22 and EN 45014 Manufacturer’s Name: Manufacturer’s Address: Hewlett-Packard Company 11311 Chinden Boulevard Boise, Idaho 83714-1021, USA declares, that the product Product Name: Model Number: Product Options: HP Color LaserJet 8550, 8550 N, 8550 DN, 8550 GN, 8550 MFP C7096A, C7097A, C7098A, C7099A, C7835A, C7836A ALL conforms to the following Product Specifications: Safety: IEC 950:1991+A1+A2+A3+A4 / EN 60950:1992+A
DOC—Duplexer DECLARATION OF CONFORMITY according to ISO/IEC Guide 22 and EN 45014 Manufacturer’s Name: Manufacturer’s Address: Hewlett-Packard Company Montemorelos 299 Guadalajara Jalisco, 45060 México declares, that the product Product Name: Model Number: Product Options: Duplexer C4782A N/A conforms to the following Product Specifications: EMC: CISPR 22:1993+A1 / EN 55022:1994 Class B1 CISPR 22:1993+A1 / EN 55022:1994 EN 50081-1:1992 EN 50082-1:1992 IEC 801-2:1991 / prEN 55024-2:1992 -4 kV CD, 8 kV AD
DOC—2,000-sheet input tray DECLARATION OF CONFORMITY according to ISO/IEC Guide 22 and EN 45014 Manufacturer’s Name: Manufacturer’s Address: Hewlett-Packard Company Montemorelos 299 Guadalajara Jalisco, 45060 México declares, that the product Product Name: Model Number: Product Options: 2,000-Sheet Input Tray C4781A N/A conforms to the following Product Specifications: Safety: IEC 950:1991+A1+A2+A3+A4 / EN 60950:1992+A1+A2+A3+A4 IEC 825-1:1993 / EN 60825-1:1994 Class 1 (Laser/LED) EMC: CISPR 22:1993+A1
DOC—Multi-bin mailbox DECLARATION OF CONFORMITY according to ISO/IEC Guide 22 and EN 45014 Manufacturer’s Name: Manufacturer’s Address: Hewlett-Packard Company Montemorelos 299 Guadalajara Jalisco, 45060 México declares, that the product Product Name: Model Number: Product Options: Multi-bin Mailbox C4785A, C4240A N/A is in conformity with: EMC: CISPR 22:1993+A1 / EN 55022:1994 Class B1 EN 50082-1:1992 IEC 801-2:1991 / prEN 55024-2:1992 -4 Kv CD, 8 kV AD IEC 801-3:1984 / prEN 55024-3:1991 -3 V/m IEC 801
DOC—3,000-sheet stapler/stacker DECLARATION OF CONFORMITY according to ISO/IEC Guide 22 and EN 45014 Manufacturer’s Name: Manufacturer’s Address: Hewlett-Packard Company Montemorelos 299 Guadalajara Jalisco, 45060 México declares, that the product Product Name: Model Number: Product Options: 3,000-Sheet Stapler/Stacker C4788A N/A is in conformity with: EMC: CISPR 22:1993+A1+A2 / EN 55022:1994+A1+A23 Class B1 EN 50082-1:1992 IEC 801-2:1991 / prEN 55024-2:1992 -4 Kv CD, 8 kV AD IEC 801-3:1984 / prEN 55024
DOC—3,000-sheet stacker DECLARATION OF CONFORMITY according to ISO/IEC Guide 22 and EN 45014 Manufacturer’s Name: Manufacturer’s Address: Hewlett-Packard Company Montemorelos 299 Guadalajara Jalisco, 45060 México declares, that the product Product Name: Model Number: Product Options: 3,000-Sheet Stacker C4788A N/A is in conformity with: EMC: CISPR 22:1993+A1+A2 / EN 55022:1994+A1+A23 Class B1 EN 50082-1:1992 IEC 801-2:1991 / prEN 55024-2:1992 -4 Kv CD, 8 kV AD IEC 801-3:1984 / prEN 55024-3:1991 -3 V/m I
VCCI statement (Japan)—8500 models VCCI statement (Japan)—8550 models EMI statement (Korea)—8500 models EMI statement (Korea)—8550 models 54 Chapter 1 - Product information EN
Laser safety statement The Center for Devices and Radiological Health (CDRH) of the U.S. Food and Drug Administration has implemented regulations for laser products manufactured since August 1, 1976. Compliance is mandatory for products marketed in the United States. This printer is certified as a “Class 1” laser product under the U.S. Department of Health and Human Services (DHHS) Radiation Performance Standard according to the Radiation Control for Health and Safety Act of 1968.
Laser statement for Finland Luokan 1 laserlaite Klass 1 Laser Apparat HP LaserJet 8500, 8500 N, 8500 DN laserkirjoitin on käyttäjän kannalta turvallinen luokan 1 laserlaite. Normaalissa käytössä kirjoittimen suojakotelointi estää lasersäteen pääsyn laitteen ulkopuolelle. Laitteen turvallisuusluokka on määritetty standardin EN 60825-1 (1994) mukaisesti.
Product information sheet The Toner Product Information Sheet can be viewed on the World Wide Web at the following URL: http://www.hp.com Click “Search” and enter “Toner Product Information Sheet” where appropriate. International customers should see page 66 for appropriate phone numbers and information. Toner safety Toner is composed of plastic and a small amount of pigment. Avoid breathing toner particles; toner might be harmful to your health. Toner can also stain clothing.
Ozone safety Ozone emission The corona assemblies found in laser printers and photocopiers generate ozone gas (O3) as a by-product of the electrophotographic process. Ozone is generated only while the printer is printing (while the coronas are energized). This HP LaserJet printer contains an charcoal filter to protect office air quality. See page 119 for suggested replacement intervals.
2 Service approach Chapter contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 Parts and supplies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 Ordering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 Obtaining related documentation and software . . . . . . 62 Ordering consumables. . . . . . . . . . . . . . . . . . . . . . . . . 62 Ordering field-replaceable units. . . . . . . . . . . . . . . . . .
60 Chapter 2 - Service approach EN
Introduction Repair normally begins with the use of printer internal diagnostics in conjunction with the troubleshooting procedures in chapter 7. When repairing an HP Color LaserJet 8550 MFP printer, first isolate the location of the problem. Usually, simply sending a print job to the printer from a computer is sufficient to determine whether or not the print engine is involved. If it is not, see the service manual specific to the HP Color LaserJet 8550 MFP printer.
Ordering Obtaining related documentation and software To order related documentation and software, contact SMO or SME at the numbers listed on the previous page. Part numbers for related documentation are listed beginning on page 514. For information through the World Wide Web, visit the following websites: Table 13. Technical support websites HP Customer Care Online http://www.hp.
Ordering field-replaceable units This printer is designed to be repaired by replacing field-replaceable units. Part numbers are located in chapter 8 of this manual and can be ordered from SMO or SME (see page 62). Parts exchange program HP offers remanufactured assemblies for some selected parts. These are identified in chapter 8 and can be ordered through SMO or SME (see page 62).
Technical assistance List Server A list server is an e-mail program that allows users to subscribe to certain mail lists by sending e-mail to the server. The list server allows HP LaserJet Technical Marketing to make the support community aware of new or urgent information by sending information to subscribers. To subscribe to hardware-related information, send e-mail to: subscribe-CLJ8500/8550-HW@chsdes1.boi.hp.
HP FIRST, U.S. Call the HP ASAP system at (1) (800) 333-1917 and follow the voice prompts to enter HP FIRST. HP FIRST, Europe Call HP FIRST at one of the following numbers: U.K: 0800-96-02-71 Belgium: 078-111906 (Dutch) Switzerland: 155-1527 (German) Netherlands: 06-0222420 Germany: 0130-810061 Austria: 0660-8128 For English-language service outside the countries listed above, call (31) 20-681-8192.
HP Software Distribution Center For printer drivers and application note orders: (1) (805) 257-5565 HP Direct For supplies and accessories orders: (1) (800) 538-8787, U.S. only Customer Support Sales Center For existing hardware and software service agreements: (1) (800) 386-1115, U.S. only For price quotes on or purchase of new hardware or software agreements: (1) (800) 743-8305, U.S.
HP Customer Care Centers HP representatives are available to answer technical questions at no charge for a period equivalent to the original HP hardware warranty period. Questions regarding operating systems such as MS-DOS®, UNIX®, or network configuration operating systems cannot be answered by the Customer Care Center, and should be referred to your dealer. Note Each time you call the HP Customer Care Centers, you will be asked to provide the printer serial number and the original date of purchase. U.S.
Asia Pacific region Customer Care Centers Table 14.
Warranty The warranty outlines specific legal rights. There might also be other rights that vary from area to area. Refer to the user’s guide for further warranty information. Installation Installation by service personnel is included with the HP Color LaserJet 8500 DN printer and is required with the HP Color LaserJet 8550 MFP. Installation is optional with all other models of HP Color LaserJet 8500 and 8550 models. Installation can be arranged through the Customer Care Center.
Recycling toner cartridges To reduce waste, HP offers a recycling program for used toner cartridges. Cartridge components that do not wear out are recycled. Plastics and other materials are recycled. HP pays the shipping costs from the user to the recycling facility.
3 Operational overview Chapter contents Verifying package contents . . . . . . . . . . . . . . . . . . . . . . . . . . 73 Verifying the cables are installed . . . . . . . . . . . . . . . . . . . . . . 74 Printer with stand. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 Printer with a 2,000-sheet input unit . . . . . . . . . . . . . . 75 Connecting the printer to the network . . . . . . . . . . . . . . . . . . 76 Connecting to a 10Base-T or 100Base-TX network . .
Selecting the display language . . . . . . . . . . . . . . . . . . . . . . . 97 Installing the consumables . . . . . . . . . . . . . . . . . . . . . . . . . . 98 Configuring input trays . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 Selecting the mode for tray 1 . . . . . . . . . . . . . . . . . . . 103 Configuring media type and size . . . . . . . . . . . . . . . . 104 Verifying the printer is installed correctly . . . . . . . . . . . . . . . 105 Configuration page . . . . . . . . . . . . . .
Verifying package contents Verify that the following items were included from the factory: 4 5 1 6 9 7 2 8 3 Figure 7.
Verifying the cables are installed Verify that the cables are connected to the printer correctly. Printer with stand Figure 8. Power cord connection WARNING! An unstable printer can tip over and cause injury; verify that the printer is secured properly and the printer wheels are locked. o The power cord plugs into the connector on the back left corner of the printer and into a surge protector or other grounded power source.
Printer with a 2,000-sheet input unit Power pack Interface cable Power cords Figure 9. C-link and power cables connections o The interface cable attaches to the printer above the parallel connector and to the connector on the 2,000-sheet input unit. o The power pack attaches to the back of the printer. o The shorter of the two cables from the power pack plugs into the connector on the back left corner of the printer.
Connecting the printer to the network If the printer was shipped with an optional HP JetDirect internal print server, one of two types is installed: l HP JetDirect Ethernet print server supports up to three different network interface cables—RJ-45 (unshielded twisted pair) for 10Base-T networks, BNC (coaxial) for 10Base2 networks, and DIN-8 for LocalTalk networks. This print server supports only one Ethernet connection at a time—RJ-45 or BNC.
Connecting to a 10Base-T or 100Base-TX network o The connector of the unshielded twisted pair network cable plugs into the RJ-45 port. Connecting to a 10Base2 network o Attach one section of the ThinLAN (coaxial) cable to a BNC “T” connector. o Attach another ThinLAN cable section, or (if it is at the end of the network) a 50-ohm terminator, on the other side of the BNC “T” connector. o Plug the BNC “T” connector into the BNC port.
Connecting a parallel cable Figure 11. Parallel cable connection o To print through the parallel port, the printer requires a 25-pin male/micro 36-pin male (“C-size”) parallel cable that is IEEE-1284 compliant. The cable is included with the base model of this printer only. It must be purchased separately for other printer models.
Changing the printer control panel overlay Replace the printer control panel overlay with the one included for your language, if applicable. Then configure the printer control panel to show printer messages in your language (see page 97). Figure 12. EN Changing the printer control panel overlay 1 Insert a thin, rigid object under the two edges of the overlay on the printer control panel and pull up evenly on both sides of the overlay until it comes off.
Printer control panel layout LCD display Go Menu Item Cancel Job – Value + Data Ready Select Attention Figure 13. Location of printer control panel features Go Brings the printer online or offline and exits menus; will override load tray messages to print on the default media size and type. Menu Allows access to the printer control panel menus to set the printer defaults. This key permits both forward and backward movement through the list of available menus.
Item Steps through the items in a particular menu. This key permits both forward and backward movement through the available items. Use the right side of the key to activate online help in all HP Color LaserJet 8550 printer models. Ready Indicator (green) l On—The printer is online and able to accept and process data. l Off—The printer is offline and unable to accept or process data. l Flashing—The printer is going from online to offline, or from offline to online.
Menu maps Press MENU to cycle through the printer control panel menus. Each menu is described in a separate table in this section. Menu items are displayed only if their associated option or function is installed or activated. All menus and their associated items are accessible when the printer is online.
Information Menu Press SELECT to print. The printer displays READY when finished. Table 15. Information Menu Item Value Description/action PRINT MENU MAP None Shows current settings of all menu items. PRINT CONFIG PAGE None Shows the configuration of the printer including installed options and serial numbers. PRINT PCL FONT LIST None Shows installed PCL fonts including soft fonts. PRINT PS FONT LIST None Shows installed PostScript fonts.
Proof and Print Menu (HP Color LaserJet 8500) This menu appears only if the printer has a hard disk installed. Table 16. Proof and Print Menu Item Value Description/action SELECTED PRINTED = Number of copies SELECTED PRINTED To cancel a proof and print job: 1 Press ITEM to display the job name and job owner. SELECTED PRINTED 2 Press – VALUE + to change the number of copies to be printed.
Private/Stored Jobs Menu (HP Color LaserJet 8550) This menu appears only if the printer has a hard disk installed. Table 18. Proof and Print Menu Item Value Description/action SELECTED PRINTED = Number of copies SELECTED PRINTED To cancel private and stored jobs: 1 Press ITEM to display the job name and job owner.
Table 19. Paper Handling Menu (continued) Item Value Description/action TRAY 1 SIZE= AUTO (8550 only) LETTER* LEGAL A4 A5 11X17 A3 EXEC JIS B4 JIS B5 JPOSTD COM10 MONARCH C5 DL B5 CUSTOM Appears only if TRAY 1 MODE=CASSETTE.
Table 19. Paper Handling Menu (continued) Item Value Description/action MANUAL FEED= OFF* ON Allows the user to feed media into the printer by hand rather than automatically from an input tray. The user can select manual feed instead of automatic input tray as the default for the paper source. If MANUAL FEED = ON and an input tray is not selected, then manual feed is selected.
Configuration Menu Table 20. Configuration Menu Item Value Description/action POWERSAVE= 30 MIN 1 HOUR* 2 HOURS (8500 only) 3 HOURS 8 HOURS (8550 and some 8500 models) 10 SEC Sets the length of time after use before the printer switches to powersave mode. PERSONALITY= AUTO* PCL PS Allows the user to determine which personality will be the default for the printer. When AUTO is selected, the printer will determine which personality to use for each print job.
Printing Menu Table 21. Printing Menu Item Value Description/action COPIES= 1* to 999 Sets the number of uncollated copies to be sent if the number of copies is not defined by the print job. PAPER= LETTER* LEGAL A4 EXEC A5 11X17 A3 JIS B4 JIS B5 JPOSTD Sets the default media size. The default media size is used for jobs that do not include media size commands, or when the requested media size is not installed in the printer. ENVELOPE= COM10 MONARCH C5 DL B5 ENVELOPE is not a separate item.
Table 21. Printing Menu (continued) Item Value Description/action PCL SYMBOL SET= PC-8* ROMAN-8 ISO L1 ISO L2 ISO L5 ISO L6 PC-775 PC-8 DN PC-850 PC-852 PC-8TK PC-1004 WIN L1 WIN L2 WIN L5 WINBALT DESKTOP PS TEXT LEGAL ISO-4 ISO-6 ISO-11 ISO-15 ISO-16 ISO-17 ISO-21 ISO-60 ISO-69 WIN 3.0 MC TEXT Default symbol-set mapping. Used only for jobs that do not include symbol-set selection commands. COURIER= REGULAR* DARK DARK emulates the heavier Courier font of the HP LaserJet III printer.
Duplex Registration Menu (HP Color LaserJet 8550) Table 22. I/O Menu Item Value Description/action TRAY 1 PRINT TEST PAGE TRAY 1 X= -5 . . . 0* . . . 5 TRAY 1 Y= -5 . . . 0* . . . 5 TRAY 2 PRINT TEST PAGE TRAY 2 X= -5 . . . 0* . . . 5 TRAY 2 Y= -5 . . . 0* . . . 5 TRAY 3 PRINT TEST PAGE TRAY 3 X= -5 . . . 0* . . . 5 TRAY 3 Y= -5 . . . 0* . . . 5 TRAY 4 PRINT TEST PAGE TRAY 4 X= -5 . . . 0* . . . 5 TRAY 4 Y= -5 . . . 0* . . . 5 * Default setting.
Resets Menu Table 24. Resets Menu Item Value Description/action FACTORY DEFAULT RESET None Resets menus to the factory settings. I/O Menu and Color Adjust Menu values do not change. RESET ACTIVE I/O None Resets I/O to known state. RESET ALL I/O None Used to clear I/O problems. RESET TRANSFER LIFE COUNT None Used to indicate that a new transfer kit has been installed. RESET FUSER LIFE COUNT None Used to indicate that a new fuser kit has been installed. Color Adjust Menu Table 25.
Service Mode Menu The Service Mode Menu can be entered only by pressing the left side of the ITEM and the VALUE keys at the same time. For more information about using the Service Mode Menu, see page 420. l NVRAM SETTING (nonvolatile random-access memory setting) menu is provided to replace values that might be lost when a formatter board or control board is replaced in the field.
Table 26. Service Mode Menu (continued) Service Mode Menu Item Value Description/action NVRAM SETTING (continued) DUPLEX COUNT Number of duplex pages processed. TRANSFER LIFE LEFT Remaining life, from 0 to 100 percent. FUSER LIFE LEFT Remaining life, from 0 to 100 percent. ENGINE SETTING 1 The registration values of the engine used to align the various color planes.
Table 26. Service Mode Menu (continued) Service Mode Menu Item Value REPEAT= NO* YES ON FAULT= BREAK* CONT PAUSE Description/action BREAK stops at error and only the printer control panel displays a message. CONTINUE does not stop at error, and error is posted only to the fault log. PAUSE stops at error and the printer control panel displays a message. Press SELECT to continue. Then, error is also posted to the fault log. PAPER PATH ROM CRC= YES* NO Firmware read-only memory (ROM) is tested.
Table 26. Service Mode Menu (continued) Service Mode Menu Item Value REPETITIONS 1* . . . 10 TRAY 1= ON* OFF TRAY 2= ON* OFF TRAY 3= ON* OFF OUTPUT = TOP OUTPUT BIN* Description/action LEFT OUTPUT BIN DEVELOPER MOTOR REPETITIONS 1* . . . 10 EXECUTE TEST DRUM MOTOR REPETITIONS 1* . . . 10 EXECUTE TEST SENSOR MONITOR EXECUTE TEST 0123456789AB 000000000000 Once EXECUTE TEST is selected, the current value (0 or 1) of each of the 10 sensors is shown on the display, on the lower line.
Selecting the display language The printer supports printer messages and prints configuration pages in a variety of languages. Use the printer control panel to set the display language. 1 Note To enter configure language mode, hold down SELECT while turning the printer on. When CONFIG LANGUAGE (in English) appears on the printer control panel display for approximately one second, release SELECT. Once the printer has restarted, LANGUAGE = ENGLISH appears on the display.
Installing the consumables When installing a new printer, install the consumables in the printer in this order: 1 Imaging drum 2 Black toner cartridge 3 Color toner cartridges 1 2 3 Figure 14.
To install the imaging drum 1 A B C 2 1 Open the front door of the printer (A). Swing the upper (blue) lever to the right (B). Press the white button on the lower (green) lever and swing the lever to the right (C). CAUTION There is a cover protecting the drum cylinder. Do not remove this cover or the drum might be damaged; it will come off during the next step. 2 Push the drum into the printer. The protective cover slides off as the drum enters the printer.
To install the black toner cartridge 1 1 Remove the black toner cartridge from its packaging and gently rock the cartridge several times to distribute the toner. CAUTION Do not lift or remove the shutter (A) on the cartridge. 2 A 3 4 2 Align the arrow on the top of the cartridge with the arrow at the top of the slot in the printer and slide the cartridge into the printer. 3 Place one hand on the cartridge and use the other hand to pull the orange ring and remove the seal. Discard the seal.
1 To install the color toner cartridges 1 With the printer on, press the blue button beneath the carousel door to turn the carousel to a toner cartridge slot.
4 4 Align the arrows on the top of the cartridge and at the top of the slot. Slide the cartridge into the printer. Note If the cartridge does not slide completely into the printer, make sure that the color of toner in the cartridge matches the colored sticker on the slot. 5 5 Place one hand on the cartridge and use the other hand to pull the orange ring and remove the seal. Discard the seal. 6 Push the blue locking lever back to the left and close the carousel door.
Configuring input trays When input trays are configured correctly, the printer automatically uses the correct input tray based on media type and size. Note Setting the media type is necessary for best print quality on envelopes, paper heavier than 24 up to 28 lb (90 to 105 g/m2) bond paper, and paper heavier than 28 lb (105 g/m2) bond. For example, tray 2 could contain letterhead; tray 3, plain legal-sized paper; and the 2,000-sheet input unit, plain letter-sized paper.
Configuring media type and size Configuring the media type is beneficial for several reasons: Note Note l Configuring the media type prevents printing on the wrong (and possibly more expensive) media. l If a user changes the type of media in an input tray, other users can still print on the correct media. l The printer automatically adjusts its print speed to accommodate special media (such as card stock, labels, and transparencies).
Verifying the printer is installed correctly Configuration page Print a configuration page to verify that the printer was installed correctly.
Verifying DIMM installation The HP Color LaserJet 8500 printer comes with the following amounts of memory installed in slots 1 and 2: l 16-MB DIMMs in the base and N models l 32-MB DIMMs in the DN model The HP Color LaserJet 8550 printer comes with the following amounts of memory installed in slots 1 and 2: l 16-MB DIMMs in the base model l 32-MB DIMMs in the N, DN, and MFP models (2 x 32 = 64) l 64-MB DIMMs in the GN model (2 x 64 = 128) In all printer models, slots 3 through 8 are available for
Duplex registration (HP Color LaserJet 8550) The duplex registration feature allows precise alignment of images on the front and back of a duplexed page. Image placement varies slightly for each input tray. The alignment procedure must be performed for each tray. Y Axis Figure 16. EN X Axis Tray 2 Duplex Registration Adjustment Duplex registration 1 Press MENU until DUPLEX REGISTRATION MENU appears on the printer control panel display.
9 Press ITEM to scroll up through the duplex registration menu until PRINT TEST PAGE appears for the tray you want. 10 Press SELECT to print the page. 11 Repeat step 4 to verify that the lines on the front and back of the page are now properly aligned. Note If the lines on the front and back do not properly align, then repeat steps 4 through 9 until they properly align.
Booklet printing Booklet printing is available on all HP Color LaserJet 8550 printer models and on HP Color LaserJet 8500 models with the PCL upgrade. Booklet printing allows the pages of a print job to be arranged so that the document can be folded and stapled or bound into a book. Booklet printing is supported in PostScript and PCL5c in Windows 3.x, 9x, NT 4.0, Windows 2000, and using the Booklet Maker for Macintosh. Note Duplex printing must be selected in order to use the Booklet Printing feature.
HP TonerGauge (HP Color LaserJet 8550) Note The HP TonerGauge feature is not enabled on HP Color LaserJet 8550 MFP printers. The HP TonerGauge feature allows the user to estimate how much toner is left in the cartridges. The HP TonerGauge indicator appears on the configuration page, on the status tab of the driver, and in HP Web JetAdmin (for the network administrator). The toner level indicated by the gauge may be used to estimate whether enough toner remains in the cartridges to complete a print job.
4 Printer maintenance Chapter contents Cleaning procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 Cleaning the post charger . . . . . . . . . . . . . . . . . . . . . 113 Cleaning the density sensor . . . . . . . . . . . . . . . . . . . 114 Cleaning the transfer charger . . . . . . . . . . . . . . . . . . 115 Cleaning the toner catch tray. . . . . . . . . . . . . . . . . . . 116 Printer consumables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
112 Chapter 4 - Printer maintenance EN
Cleaning procedures Cleaning the post charger Clean the post charger on the transfer drum if there are light streaks in halftone areas. To clean the post charger EN 1 Open the right upper door. 2 Locate the post charger unit cleaner next to the transfer drum handle. 3 Slide the post charger unit cleaner across the bar several times. 4 Push the cleaner back into place. 5 Close the right upper door.
Cleaning the density sensor Clean the density sensor after replacing the imaging drum and when printed colors are inaccurate. To clean the density sensor and erase lamp 1 Open the right upper door. 2 On the inside of the door, locate the density sensor and the density sensor brush. Use the brush to brush off toner particles from the density sensor and the erase lamp. Note You can also use a hand wipe to clean the density sensor.
Cleaning the transfer charger Clean the transfer charger when irregular wavy patterns appear in solid backgrounds. To clean the transfer charger EN 1 Open the front door. 2 Find the knob below the transfer charger. 3 Pull the knob out and push it back in. 4 Close the front door.
Cleaning the toner catch tray The toner catch tray will not normally have much toner in it. Clean the toner catch tray before moving the printer to another location or when performing routine maintenance at the customer site. Figure 17. 1 Open the front door. 2 Remove the toner catch tray cover by releasing the tab on the right side of the cover with a small screwdriver.
3 Remove the toner catch tray. 4 Vacuum toner out of the tray, or use a hand wipe to clean the tray if there is a small amount of toner in the tray. WARNING! Do not use a regular vacuum to clean up toner. The toner can penetrate the vacuum bag, and toner might be harmful if inhaled. Figure 18. Cleaning the toner catch tray 5 EN Reinstall the toner catch tray and cover, and close the front door.
Printer consumables 1 2 3 4 5 7 6 10 8 11 9 Figure 19. Location of consumables in printer 1 2 3 4 5 6 Color toner cartridges Black toner cartridge Imaging drum Cleaning roller Transfer belt Transfer drum 7 8 9 10 11 Air filters Transfer charger Pick-up/feed rollers Charcoal filter Fuser HP encourages responsible disposal of HP printer consumables through its printing supplies recycling program. All consumables listed above can be disposed of through the printing supplies recycling program.
Replacement frequencies Table 27 lists the approximate schedule for replacing consumables and the printer messages that appear when each consumable should be replaced (see page 513 for part numbers). For best print quality output, use HP consumables that have been designed to work together in this printer. For an explanation of printer control panel messages, see page 368. Table 27.
Replacing consumables Toner cartridges For information about replacing the black and color toner cartridges, see page 100 and page 101. Transfer kit Replace the parts in the transfer kit when the printer control panel displays: TRANSFER KIT LOW / REPLACE KIT TRANSFER KIT OUT / REPLACE KIT 1 2 3 5 4 Figure 20.
3 To replace the transfer kit 1 Open the front door of the printer. 2 Push the white button on the lower (green) lever and swing the lever to the right. 3 Open the upper door on the right side of the printer, and remove the transfer drum. 4 On the right, back wall of the opening, firmly pull the blue knob to release the right end of the cleaning roller. Lift the roller slowly out and to the right to release the left end.
9 9 Replace the belt by resting the ends of the new belt in the notches inside the printer. Place the gear side in the notch first to mesh the gear teeth. 10 Rotate the belt down into place. 11 Note Damage to the drum can cause print quality problems. Hold the drum only by the handles. 11 Remove the protective sheet covering the new transfer drum by pulling the tab. Discard the sheet. Reinstall the transfer drum. 12 13 12 Remove the transfer charger.
16 15 Hold the new filter by the small handles, and remove the new filter from its packaging. 16 Slide the filter in under the guides in the opening and close the blue filter door, making sure it clicks into place. 22 17 Close the upper right door. If the door does not close, the drum might not be all the way in the printer. 18 In the front of the printer, swing the lower (green) lever to the left, making sure it clicks into place. 19 Close the front door and turn the printer on.
Drum kit Replace the parts in the imaging drum kit when the printer control panel displays any of the following messages: DRUM LIFE LOW / REPLACE DRUM KIT DRUM LIFE OUT / REPLACE DRUM KIT DRUM ERROR / REPLACE DRUM KIT 3 1 Figure 21.
out” “Drum life low” warns the user that the imaging drum has only about 20% of its life remaining. This should allow the user time to order a replacement imaging drum kit before “drum life out.” The user can continue to operate the HP Color LaserJet 8500/8550 printer until “drum life out” occurs, at which point the printer will not operate. The user should be advised that: EN Drum life specification assumes two-page jobs, one-sided printing on letter- and A4-sized pages.
2 3 To replace the imaging drum and air filters 1 Open the front door. 2 Swing the upper (blue) lever to the right. Then, press the white button on the lower (green) lever and swing it to the right. 3 Pull the drum partway out. Grasp the blue handle on the top of the drum and remove the imaging drum. CAUTION A gray cover protects the new imaging drum. Do not remove this cover; it will come off during the next step. 4 4 Line up the guides and push firmly to slide the new drum into the printer.
8 8 On the back of the printer, release the two latches on the filter door and lower the door. 9 Remove both filters from the door. 10 Insert the new filters into their respective locations. 9 11 Close the filter door. If the filter door does not close, make sure the filters are in place. Use the hand wipe to remove toner from your hands. 12 Place the used parts in the packaging from the new ones. See the included recycling guide for recycling information.
Fuser kit Replace the parts in the fuser kit when the printer control panel displays: FUSER LIFE LOW / REPLACE KIT FUSER LIFE OUT / REPLACE KIT 1 2 3 Figure 22. Note Contents of fuser kit 1 Fuser 2 Hand wipe 3 Six paper rollers The paper rollers are all the same; any of the rollers can be used in any of the replacement locations. If you do not have an optional 2,000-sheet input unit, you will need only four of the rollers.
3 To replace the fuser WARNING! The fuser is very hot and can cause burns. Turn the printer off and allow the printer to cool for at least 30 minutes before beginning this procedure. 4 1 If an optional multi-bin mailbox is attached to the printer, pull the mailbox away from the printer. 2 Open the lower door on the left side of the printer. 3 If the printer contains an optional duplexer, press the green tab on the right side of the duplexer and pull the duplexer out of the printer.
7 8 7 Firmly pull the fuser up by the blue tabs on both ends, and then pull the fuser out. 8 Use the blue tabs on the new fuser to slide it into the printer along the guides. On the left side of the fuser, rotate the blue gear up two or three times until the fuser drops into place. CAUTION Use only the blue tabs to push the fuser into the printer. 9 9 On the right side of the fuser, push the green lever down. 10 Rotate the blue levers up until they snap into place.
2 3 4 To replace the rollers 1 Remove trays 2 and 3. 2 On the inside right of each opening, locate the two paper rollers that are blue on the ends. Note The separation rollers that are not blue on the end will not be replaced. 3 On the end of each roller, pinch together the release lever and handle between two fingers and slide the roller off of its spindle. Set the rollers aside. 4 While holding the new roller by its handle, slide the roller onto the spindle until it clicks into place.
7 7 Locate the two rollers. Remove the rollers (upper roller first) and replace them (lower roller first). Note Press down on the lower roller while replacing the upper one. 12 8 Close the vertical transfer door and turn the printer on. 9 The printer control panel should display the message PRESS SELECT IF FUSER IS NEW. If it displays the message, go to step 10. If it does not, go to step 11.
5 Theory of operation Chapter contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135 Color theory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138 Subtractive color theory . . . . . . . . . . . . . . . . . . . . . . . 138 Additive color theory . . . . . . . . . . . . . . . . . . . . . . . . . 140 Image formation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141 Electrostatic latent image formation block . . . . .
Electrical systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164 Power distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . 164 Fuser control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166 High-voltage power supply circuit . . . . . . . . . . . . . . . 167 Mechanical systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169 Laser/scanner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169 Motors and heaters . . . . . . . . . .
Introduction This chapter presents the theory of operation and the functional overview for the printer. It provides the service representative with an understanding of the printing process required to service the printer.
Figure 23 shows a cross-sectional view of the internal components of the printer. 1 2 3 4 5 6 30 7 8 29 28 27 9 26 25 10 11 12 24 13 23 14 22 21 20 Figure 23.
1 Black toner cartridge 17 Registration roller 2 Imaging drum 18 Transfer charger 3 Charging roller 19 Upper fusing roller 4 Imaging drum cartridge 20 Lower fusing roller 5 Laser/scanner 21 Tray 2 6 Preconditioning exposure LED 22 Tray 3 7 Post charging unit 23 Duplexer deflector 8 Transfer drum 9 Transfer belt 24 Left (face-up) output bin deflector 10 Tray 1 11 Tray 1 pick-up roller 12 Separation pad 13 Feed roller 1 14 Feed roller 2 15 Separation rollers 25 Left (face-up) output
Color theory There are two methods used to create color. The subtractive process (which is used in this printer) and the additive process (which is used in monitors and television). Subtractive color theory The subtractive color theory deals with mixing color pigments (such as those found in toner, ink, and paint) to produce any color. The subtractive primary colors are cyan, yellow, and magenta. Primary colors will produce any color in the spectrum when combined in certain proportions.
Subtractive color mixing Table 29 describes how mixing equal amounts of subtractive colors produces other colors. Table 29. Subtractive color mixing Mix equal amounts of... To produce... Cyan + Yellow + Magenta Black Cyan + Yellow Green Yellow + Magenta Red Magenta + Cyan Blue Half-toning Half-toning (also called dithering) is a method used to distribute color pigment to create a full spectrum of color.
Additive color theory The additive color theory deals with colors that are produced when light sources are mixed. The primary additive colors are red, blue, and green. Adding various levels of these colors, which are generated by a light source (such as a color monitor), produces all other colors. Mixing equal amounts of the additive primary colors produces the colors indicated in table 30. Table 30. Additive color mixing Mix equal amounts of... To produce...
Image formation Figure 24 and figure 25 give an overview of the image formation process. Figure 24.
Figure 25 shows the simultaneous processes of image formation and paper pick-up that occur during the electrostatic latent image formation block. Figure 25. Electrostatic latent image formation block Note In the following sections, the text is numbered to match each of the numbered steps in the process flowchart above.
Electrostatic latent image formation block One of the differences between color and black-and-white laser imaging is that the color image is created with multiple layers. This printer contains four toner cartridges (cyan, magenta, yellow, and black). The electrostatic latent image formation block consists of three steps for forming the image on the imaging drum. At the end of the last step, the negative charge on the unexposed area remains while the negative charge on the exposed area is decreased.
2. Primary charging In preparation for the latent image formation, the imaging drum surface is charged so that it has a uniform negative potential. AC and DC bias are applied to the primary charging roller to create uniform negative potential charge on the drum surface. Figure 27. Primary charging of imaging drum 3. Laser beam exposure When the laser beam scans the imaging drum surface, the charge on the exposed area is decreased. This area then forms the electrostatic latent image.
Developing block The black toner used in the printer is magnetic single-component toner composed of magnetite and resin. The color toner is nonmagnetic single-component toner composed of resin. The toners are given a negative charge when they rub against the developing cylinder and the blade. 4. Development The developing cylinder is biased to create a potential difference with the imaging drum. This bias consists of AC and DC components.
Transfer block The image is built up on the transfer drum in layers of toner. The toner is then transferred to the paper. The transfer block includes the transfer of the toner from the imaging drum to the transfer drum, then from the transfer drum to the paper. 5. Primary transfer A positive DC bias is applied to the transfer drum during printing to transfer the toner that is on the imaging drum to the transfer drum. This process occurs in sequence for the four colors (yellow, magenta, cyan, black).
6. Post charging AC and DC bias are applied to the post charging unit to add the appropriate bias to the toner that is on the transfer drum and to increase the efficiency of the secondary transfer. The post charging unit is turned on during the yellow toner primary transfer as well as after the entire image is formed. During the yellow toner transfer, the negative charge is decreased.
7. Secondary transfer The paper is pressed against the transfer drum when the transfer belt press clutch (CL4) pushes the transfer belt up to the transfer drum. Positive DC bias is applied to the transfer belt to transfer the toner that is on the transfer drum surface to the paper. The positive DC bias value changes according to the paper type (such as plain, heavy, or overhead transparency) and environmental conditions.
8. Separation The paper is separated from the transfer drum because of the paper’s elasticity. When duplex printing or overhead transparency (OHT) printing is performed, an AC bias is applied to the transfer charger. In high temperature/high humidity conditions, the AC bias is not applied since excessive charge does not build up in high humidity conditions. The AC bias is applied to the transfer charger to prevent discharge between the paper and the transfer belt, which can disrupt the image. Figure 32.
Transfer drum cleaning block This block follows two steps to clean the transfer drum. Even though most of the toner is transferred to the paper during secondary transfer, some toner particles remain on the transfer drum surface. This residual toner on the transfer drum is returned to the imaging drum, where it will be moved to the waste toner case. 9. Cleaning roller charging Bias is applied to the cleaning roller so that the residual toner on the transfer drum surface is charged positive.
10. Transfer drum cleaning The bias on the imaging drum is negative, and the bias on the transfer drum is positive. Because the charge on the residual toner is made positive by the transfer drum cleaning roller, the toner moves from the transfer drum to the imaging drum, where it will be removed during imaging drum cleaning. Figure 34.
Imaging drum cleaning block In the primary transfer, not all of the toner on the imaging drum is transferred to the transfer drum, leaving some toner on the imaging drum surface. Also, additional toner is placed on the imaging drum surface when the transfer drum is cleaned. 11. Imaging drum cleaning To prepare for the next printing operation, the cleaner blade scrapes the residual toner off the imaging drum surface.
Fusing block The toner image placed on the paper during transfer adheres to the paper by static electricity, and a light touch will smear the image. During fusing, the four toner colors are melted on the paper to create a permanent image. 12. Fusing The surfaces of the upper and lower fusing rollers are coated with silicone, which has excellent offset prevention performance.
Consumable detection mechanisms For information on resetting the consumable life counts, see table 24 on page 92. Drum kit life detection The imaging drum cartridge contains a memory device. The number of images printed is written to the imaging drum cartridge memory. The controller board senses the imaging drum life expiration based on the data from the imaging drum cartridge memory.
controller board stops the printer and signals DRUM LIFE OUT / REPLACE DRUM KIT. Printing cannot continue without a new imaging drum being installed. Note If the imaging drum cartridge memory fails, a warning will be displayed on the printer control panel. Printing can continue until the waste toner sensor indicates full. Figure 37.
Transfer kit life detection The transfer kit life is determined by both the page and image counts. The number of images printed is stored in the formatter, and the controller board senses the transfer kit life expiration based upon this data. When the life data reaches 149,000 pages or 299,000 images total, TRANSFER KIT LOW / REPLACE KIT is displayed on the printer control panel. The printer is still able to print after the transfer kit low warning.
around the detection window. The light receiver of PS621 detects the toner. After PS621 detects light, the controller board notes the time until light can no longer pass through the detection window. The controller board signals the formatter that the color toner cartridge has no toner if the time the light passes through the detection window exceeds the fixed time. The printer detects the toner level when the printer is turned on, or while the stirring plate is rotating.
Color toner lever detection The printer has a color toner lever sensor (PS1902) to prevent toner cartridge setup failure. This sensor consists of a light receiver and a light emitter. If the color toner lever is set incorrectly, the light from the light emitter is reflected by the color toner lever and detected by the light receiver. The controller board monitors the sensor when the carousel door is closed.
Black toner level detection and cartridge detection The toner antenna in the black toner cartridge detects the black toner level. The controller board monitors the toner level sensor signal output from the toner antenna via high-voltage PCA 1. The controller board checks the signal at the moment that the black developing AC bias is applied to the black developing cylinder. If the toner level is less than specified, the controller board signals the formatter that the black toner cartridge has no toner.
Color calibration density sensor The density sensor inside the right upper door senses the density detection pattern for each color formed on the transfer drum during a calibration cycle. The sensor emits light from the LED, and the density detection pattern on the transfer drum reflects the light. The sensor then receives the light with the photo diode and that information is converted to digital values and stored on the controller board.
Transfer belt control During secondary transfer, the controller board activates the transfer belt press clutch (CL4). The transfer belt is normally away from the transfer drum, except while pushed against the transfer drum during secondary transfer. When the secondary transfer is complete, the transfer belt is removed from the transfer drum when the controller board sets the CL4 to off. Figure 41.
Cleaning roller control The controller board activates the cleaning roller press solenoid (SL1). SL1 presses the cleaning roller to the transfer drum just after the secondary transfer begins. When the SL1 signals on, the cleaning roller press cam presses the cleaning roller, and the cleaning roller presses against the transfer drum. When the transfer drum cleaning and secondary transfer are complete, the controller board sets the SL1 off to detach the cleaning roller from the transfer drum. Figure 42.
cartridge stop position flag); the yellow, magenta, and cyan cartridge stop position flags (three flags); and the fetch (removal or replacement) flags (four flags). When the controller board receives the print signal from the formatter, the carousel motor (M1) is turned on at normal speed.
Electrical systems Power distribution The low-voltage power distribution circuit transforms the AC input voltage to supply the DC power sources, +24VB and +5V, on which the printer operates. The +24V source feeds the various motors, solenoids, and exhaust fans within the printer, while the +5V source feeds the controller board and image processor. High-voltage power supply/ Separation discharge highvoltage converter PCA Figure 44.
When the printer receives the Power Save command from the formatter board, the controller board turns off the FET switch in the main relay PCA and stops the supply of +24 UH. Additionally, the sensors, carousel motor, and toner cartridge motor are turned off. After the fuser cools down, all fans are also turned off. When the printer receives the “wake up” command from the formatter board, the printer leaves Power Save mode and resumes normal operation. High-voltage power supply Figure 45.
Fuser control The fuser controller directly interfaces with both the power supply and controller board. As the surface temperature of the upper and lower fusing rollers rises, the resistance of the thermistors drops and the voltage of the fusing temperature detection signals also drops. Table 31 shows the temperatures the formatter sets, based on the media in use. Table 31.
High-voltage power supply circuit The printer contains three high-voltage PCAs (shown in figure 46) that are directly controlled by the controller board: Developer/imaging drum bias supply, which controls: • cartridge motor (M3) • imaging drum bias • black developing bias • color developing bias High-voltage power supply, which controls: • transfer drum • cleaning roller • transfer belt • post charging unit • upper fusing roller Separation discharge high-voltage converter PCA which controls: • t
Developer/imaging drum bias supply Figure 46.
Mechanical systems Laser/scanner The laser/scanner unit scans the laser beam across the imaging drum. Video signals sent from the formatter are pulse-width modulated and converted to video data signals. The video data signals are then converted to two low-voltage differential signals (which suppress radio frequency emissions), and are sent to the laser driver PCA.
Figure 47. Laser/scanner If the laser/scanner motor does not reach operating speed within seven seconds of rotation, then the laser/scanner motor lock detection circuit generates a scanner motor failure, and the laser/ scanner motor stops.
Motors and heaters The following section describes the motors and heaters in the printer. Figure 48. Printer motors and heaters Table 32.
Carousel motor (M1) The carousel motor (M1) is a two-phase stepping motor, and rotates the carousel. The motor operates at low and normal speeds depending on the printer function (such as sensing toner cartridges or printing). Figure 49.
Drum motor (M2) The drum motor (M2) is a two-phase stepping motor, and drives the transfer drum and the imaging drum. For overhead transparencies and glossy or heavy media, the motor rotates at low speed (OHT mode: 1/4 speed rotation; glossy and heavy media: 1/3 speed rotation). The speed of the media through the fuser is identical to the speed at which the media passed through the image transfer process. Figure 50.
Cartridge motor (M3) The cartridge motor (M3) is a two-phase stepping motor, and drives the black and color toner cartridge developing cylinders. The motor rotates in the normal direction for color toner development, then the motor reverses for black toner development. The developer gear drive assembly and its associated clutches engage the proper developer drive gear based on the direction of the cartridge motor rotation. Figure 51.
Main motor (M4) The main motor (M4) is a three-phase, eight-pole, brushless motor. This motor drives the rollers related to pick-up, feeding, fusing, and delivery. This motor also drives the transfer belt press drive cam and cleaning roller press drive cam. The controller board switches the motor speed between normal speed, 1/4 speed for OHT mode, and 1/3 speed for glossy or heavy media by combining the M4 speed change signals. Figure 52.
Pick-up motor (M5) The pick-up motor (M5) is a two-phase stepping motor. M5 picks up the paper, drives tray 2 and 3 tray lifts, and activates the pick-up rollers for trays 2 and 3. During tray 2 paper pick-up, M5 is rotated at normal speed. During tray 3 pick-up, normal speed reverse rotation is used. Figure 53.
Fan motors (FM1, FM2, and FM3) The printer contains three exhaust fans, all of which use DC brushless motors. Table 33 describes when each of the fans operates and at what speed each operates. Table 33.
Paper path Figure 54 shows the printer paper path. Figure 54.
Pick-up/feed For cassette paper pick-up, the paper is sent into the printer by the pick-up roller, then fed by the feed roller. After the registration roller corrects the skew of the paper, the paper stops. The paper is then refed so that its leading edge will match the top of the image on the transfer drum. After that, the paper is fed through the transfer, separation, and fusing/delivery units to the top (face-down) or the left (face-up) output bin.
Paper pick-up Paper pick-up begins when the print signal is sent. The pick-up roller is lowered to the paper level, and the main motor (M4) rotates the roller. This process feeds the paper into the printer from the input trays. Tray pick-up — When the pick-up motor is in normal rotation, the tray 2 pick-up roller, feed roller 1, and separation roller are driven. The paper is then picked up from the tray 2 pick-up roller.
Figure 55.
Tray 1 pick-up — One sheet of paper is pressed to the multipurpose pick-up roller by the paper lifting plate and is picked up by the rotation of the pick-up roller. Any extra sheets are removed by the separation pad, then sent into the printer. Operation after transmission is the same as for tray pick-up except that the paper lifting plate solenoid is reset on to lower the paper lifting plate right after registration roller rotation.
Figure 56.
Sensors, switches, clutches, and solenoids The following figures and tables illustrate and describe the sensors, switches, clutches, and solenoids in the printer paper path. Figure 57.
Table 35.
Figure 58.
Table 36.
Switch functionality The following table describes the functionality of the paper-size switches in the printer. Table 37.
Figure 59.
Fusing and delivery unit The upper and lower rollers in the fuser and the face-up and facedown delivery rollers are driven by the main motor (M4). Paper separated from the transfer drum is fed into the fuser and delivered from the unit via the fusing roller and the fusing delivery roller. The fusing delivery sensor detects paper delivered from the fuser. The printer has a left (face-up) output bin and a top (face-down) output bin, and diverts the media to the output bins using the face-up flapper.
Figure 60.
Media jam detection The controller board checks if paper is at the appropriate sensor at the proper time. If the controller board detects a media jam, the printer stops printing and signals a jam condition to the formatter board. Printer timing The formatter PCA and controller board PCA share information during the printer operation. This information consists of printer status, command, and dot-image data. Figures 61 through 66 show the timing of different printer events.
Figure 61.
Figure 62.
Figure 63.
Figure 64.
Figure 65.
Figure 66.
EPH controller board The external paper-handling (EPH) controller board controls the communication from the printer to the input and output devices. The EPH controller board PCA is integrated onto the printer formatter PCA. Duplexer The duplexer is installed below the fusing assembly. The back side of the paper is printed first. Then the paper is turned over and fed back through the paper path to print on the front side. The duplexer supports variable engine input speeds.
Sensors, switches, clutches, and motors Figure 67 and the table below illustrate and describe the sensors, switches, clutches, and motors on the 2,000-sheet input unit. 1 9 10 11 12 2 13 3 4 14 5 15 6 16 17 7 8 Figure 67. 2,000-sheet input unit sensors, switches, clutches, and motors Ref. Control device Description Ref.
Pick-up and feed system When the 2,000-sheet input unit is loaded with paper and the paper tray is closed, the paper stack lifts into position under the pick-up, feed, and separation rollers. This operation is detected by the PS34 sensor in the 2,000-sheet input unit’s pick-up assembly. The presence of paper in the paper tray is detected by the PS33 sensor. The paper level is detected by switches SW601 and SW602. The paper size is detected by switches SW701 through SW704.
Switch functionality The following tables describe the functionality of the paper-quantity and paper-size switches in the 2,000-sheet input unit. Table 38. Paper-quantity detection switches SW601 SW602 Remaining paper Off Off 100% On Off 75% On On 50% Off On 25% Table 39.
Lifter operation The lifting plate in the 2,000-sheet input unit is held by two wires that are wound on four pulleys by the lifter motor. When the paper tray is open, the pulley gears disengage from the lifter motor gears, and the lifting plate is lowered by its own weight. The presence or absence of the tray is detected by switches SW701 through SW704 on the unit paper/tray size switch assembly.
Paper path Figure 68 illustrates the paper path components in the 2,000-sheet input unit. 5 3 4 6 7 2 8 1 Figure 68.
Multi-bin mailbox The multi-bin mailbox is an output unit designed for variable speeds, from 6 to 32 ppm. The multi-bin mailbox holds up to 2,100 sheets distributed in eight 250-sheet face-down bins and one 100-sheet face-up bin. Operating modes The multi-bin mailbox features four intelligent and configurable operating modes. EN Mailbox mode — The network administrator can address each bin as an output destination with a name assigned to it. The printer sends a print job to the selected bin.
Configuring operating modes The network administrator chooses the mode of operation through an HP network configuration utility, such as the HP JetAdmin software or the HP LaserJet utility for the Macintosh. Additionally, on all workstations that print to the printer, the printer driver might need to be set up to reflect the chosen operating mode. Bidirectional environment — The printer automatically selects the mode established by the network administrator.
Communication link (C-link) cables Communication with the multi-bin mailbox is handled through the EPH controller board on the printer. The information coming from the EPH controller board is carried by the C-link cables that connect the EPH controller board PCA to all the devices that support the C-link protocol. Figure 69 shows the C-link connections. Figure 69.
Sensors, switches, motors, and controller board PCA Figure 70 and table 40 illustrate and describe the multi-bin mailbox sensors, switches, motors, and controller board PCA. 10 1 11 2 12 13 3 4 5 14 6 7 15 8 9 Figure 70.
Table 40. Multi-bin mailbox sensors, switches, motors, controller board PCA Ref.
Paper path Figure 71 illustrates the components of the multi-bin mailbox paper path. 8 1 2 3 9 4 10 11 5 12 13 14 6 15 17 16 18 7 19 Figure 71.
3,000-sheet stapler/stacker Device configuration The HP 3,000-sheet stapler/stacker and the HP 3,000-sheet stacker attach to printers’ left sides. 3,000-sheet stapler/stacker Set the default offset action and default stapler action at the printer control panel under Configuration of Stkr. The options for default offset action are: No Print jobs or mopies are stacked without separation (although stapling options override this setting). Yes Print jobs or mopies are offset from each other.
Power supply A universal power supply is activated when the printer’s power switch is turned on. The printer’s paper handling controller sends a power-on signal to the power supply through the controller PCA. The power supply provides +26 V (volts) for motors and +5 V for sensors and controller electronics. The power supply is also activated when the controller PCA is set to service mode. Power-on sequence During the power-on sequence, an internal self-test is performed.
Paper path sensors and jam detection The paper path sensors detect paper jams as follows: Flipper entry sensor 1 (FLEntry1) and flipper entry sensor (FLEntry): • paper in the flipper at power on or after clearing a paper jam (when either sensor is activated at power on or after clearing a jam) • paper jammed before entering the flipper (when the printer sends a message that pages are being sent to the stapler/ stacker or stacker, but FLEntry1 is never activated) • paper jammed in the flipper (when FLEnt
Paper path Paper input The device receives paper from the printer at different speeds—106, 117, or 147 mm/second—depending on the printer in use. Flipper Paper arrival is sensed by FLEntry1, which activates the flipper motors. For face-up printing, the flipper simply delivers paper sensed by FLEntry to the face-up bin. Otherwise, the flipper changes page orientation from face-up to face-down and delivers paper sensed by FLExit to the accumulator assembly.
Face-up paper path Flipper entry sensor Flipper entry sensor 1 (FLEntry1) (FLEntry) Interlock switch Face-down paper path Paper input from the printer Path through accumulator Flipper Flipper exit sensor (FLExit) Accumulator exit sensor (ACExit) Stapler/carriage Gear wheel sensor (GWSens) Controller PCA Accumulator Power supply Figure 73.
Face-up paper path Flipper entry sensor Flipper entry sensor 1 (FLEntry1) (FLEntry) Face-down paper path Path through offset module Interlock switch Paper input from the printer Flipper Flipper exit sensor (FLExit) Exit sensor (Exit) Offset module Controller PCA Power supply Figure 74.
6 Removal and replacement Chapter contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222 Removal and replacement strategy . . . . . . . . . . . . . . 222 Repair notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222 Electrostatic discharge (ESD) . . . . . . . . . . . . . . . . . . 222 Required tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223 Maintenance units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Left assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253 Multi-bin mailbox/3,000-sheet stapler/stacker/3,000-sheet stacker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253 Formatter board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254 Internal printer hard disk (DN model) . . . . . . . . . . . . 256 Feeder assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257 Face-up solenoid . . . . . . . . . . . . . . . . . . . . . . .
2,000-sheet input unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 298 Front cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299 Back cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 Left cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301 Vertical transfer unit . . . . . . . . . . . . . . . . . . . . . . . . . . 302 Right cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 304 Tray 4 . . . . . . . .
Multi-bin mailbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 314 Front and back covers . . . . . . . . . . . . . . . . . . . . . . . . 315 Top cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 316 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317 Paper bins and blind cover . . . . . . . . . . . . . . . . . . . . 318 Flipper assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 319 Delivery head position motor . . . . . .
EN Chapter contents 221
Introduction Removal and replacement strategy This chapter explains how to remove and replace major printer components. Replacement is generally the reverse of removal. Occasionally, directions for difficult or critical replacement procedures are included. Repair notices WARNING! Turn the printer off and disconnect the power cord before servicing the printer. Failure to follow this instruction could result in severe injury.
Required tools The following tools are needed to service the printer: Phillips #1 magnetized screwdriver, 6-inch (152-mm) shaft Phillips #2 magnetized screwdriver, 6-inch (152-mm) shaft T-10, T-15, and T-20 Torx driver, 6-inch (152-mm) shaft Flat-blade #2 screwdriver Small pair of needle-nose pliers ESD equipment (see page 222). Penlight Can of compressed air If you are using a multi-speed screwdriver, ensure that you have a torque limiter.
Maintenance units The user replaces the following maintenance units as part of periodic maintenance. Chapter 4 explains the maintenance procedures. Color toner cartridges Black toner cartridge Imaging drum Air filters Transfer drum Transfer charger Cleaning roller Charcoal filter Fuser Paper rollers Transfer belt The printer keeps track of use on some of its user-replaceable parts.
Doors and covers The following figures show the orientation of the printer and paper handling accessories as they are referred to in this chapter. 1 4 2 3 5 6 7 8 Front Right Figure 75.
3 4 5 1 2 Rear Figure 76.
HP Color LaserJet 8500 MFP printer—separating the printer from the frame 1 Remove two screws (callout 1) from the attachment cover on the left side of the printer to release the attachment cover. 2 Remove two screws (callout 2) from the attachment bracket. 2 1 2 Figure 77. Attachment bracket, HP Color LaserJet 8550 MFP printer 3 On each side at the bottom of the rack, rotate the locking pins (callout 3) until they slide out of the holes. 2 3 Figure 78.
Front covers and panels Removing the front cover 1 Open the front cover. 2 Remove one screw holding the strap in place (callout 1). 2 3 2 2 1 Figure 79. Note Removing the front cover 3 Remove one screw holding the cover (callout 2). 4 Open the cover to approximately a 45-degree angle and lift it up to remove it. Callout 3 is the tag that shows engine settings; sections of Chapter 6, “Troubleshooting” refer to the tag.
Removing the front right cover 1 Open the front door. 2 Remove one screw in the upper right-hand side that holds the front right cover on (callout 1). 2 1 Figure 80. Front right cover 3 EN Pull the cover off.
Removing the inside left panel 1 Remove the front cover (see page 228). 2 Remove the top cover assembly (see page 232). 3 Remove eight screws on the inside panel (callout 1). 2 2 1 2 3 2 4 2 1 Figure 81. Inside left panel 4 Remove the waste toner tray cover (callout 2) by releasing the tab on the right side of the cover with a small screwdriver. 5 Remove the waste toner tray. 6 Open the left lower door to disengage the interlock.
Removing the filler panel for tray 2 (HP Color LaserJet 8550 base model) 1 Open the front cover. 2 Release the tab at the top, towards the right, of the filler panel and rotate the top of the filler panel toward you. Figure 82. Filler panel for tray 2 Note One screw secures the filler panel bracket. To replace the filler panel with a tray 2, remove the screw and the bracket before attempting to install a tray 2.
Top cover assembly 1 Remove the front right cover (see page 229). Leave the front door open. 2 Open the left door and loosen the two screws (callout 1). 2 1 Figure 83. Screws behind left door 3 Open the right door and loosen the two screws (callout 2). 2 Figure 84. Screws behind right door 4 Open the front cover.
5 Lift the cover up and unplug the connector (callout 3) at the rear of the cover. 2 3 Figure 85. Connector on top cover 6 EN Remove the top cover assembly.
Left covers and doors Removing the left rear cover 1 Open the left upper door. 2 Support the door and squeeze the prong with needle-nose pliers to unhook the strap holding the door to the left rear cover (callout 1). 2 1 Figure 86.
3 Remove 11 screws (callout 2). 2 2 Figure 87. Screws on left rear cover 4 EN Pull the cover to the left and off.
Removing the left upper cover 1 Remove the left rear cover (see page 234). 2 Remove two screws on the rail (callout 1, one screw is on the left side of the cover and the other is located inside the front cover). 2 1 Figure 88. Screws on upper left door 3 Remove the door.
Removing the left lower cover 1 Open the left lower cover. 2 Push the spring-loaded stopper hinges (callout 1) towards the printer and down to release them. 2 1 Figure 89. EN Stopper hinges on lower left cover 3 Move the cover to a 45-degree angle and lift the right side out. 4 Slide the cover to the left and up to release the left side.
Right covers and doors Removing the right upper cover assembly Tray 1 is part of the right upper door. Take the tray off and save it if you are replacing the whole assembly (see page 261). The new assembly does not include the tray. Note 1 Remove the rear cover (see page 243). 2 Open the right upper door. 3 On the right side of the door, unplug four connectors that lead through the printer frame to the right upper cover (callout 1).
5 With needle-nose pliers, remove the e-ring from the hinge (callout 2) on the left side of the door. 2 Figure 91. EN E-ring 6 Remove the front right cover (see page 229). 7 Rotate the plastic tab (located on the left hinge) in an upward direction to a 90-degree angle. 8 Lift the door slightly to the left and pull it away from the chassis.
Removing the right cover subassembly Note Note Use this procedure if you want to separate the right cover subassembly from the right upper cover. 1 Open the right upper cover assembly slightly. 2 Pull the right side of the subassembly slightly to the right and pull outward on the right side to snap it out of place. 3 Move the subassembly slightly to the left and to remove it. There is a small spring on the left side of the subassembly—be careful it does not fall off.
Removing the right rear cover 1 If you have a 2,000-sheet input unit, open the VTU. 2 Remove one screw (callout 1). 2 1 Figure 93. Right rear cover 3 EN Pull the bottom of the cover out and then down to remove the cover.
Removing the right lower cover assembly 1 Remove the front right cover (see page 229). 2 If you have a 2,000-sheet input unit, open the VTU. 3 Remove the right rear cover (see page 241). 4 Remove four screws on the right lower cover in place (callout 1). 2 1 Figure 94. Screws on the right lower cover 5 Unfasten the holding strap on the right. 6 Remove tray 2 and tray 3, and release the locking tabs inside the tray 3 area.
Rear cover 1 For HP Color LaserJet 8550 MFP printer models, complete the following steps before continuing to step 2 on the following page: a Release two thumb screws (callout 1) to disconnect the video I/O connector. b Remove three screws (callout 2) from inside the opening; the plate remains attached to the rear cover. 2 1 2 Figure 95.
2 Remove the rear lower left cover (one screw) (callout 1). 2 2 4 2 3 Figure 96. Note 2 1 2 4 Rear cover 3 Remove the left rear cover (see page 234). 4 Open the right upper door. 5 Remove three screws in the sheet metal tab (callout 2). 6 Remove the right rear cover (see page 241). 7 Remove two screws (callout 3). 8 Remove 13 screws on the rear cover (callout 4). Two screws are holding the cover to the hinges at the bottom. It is not necessary to remove these screws.
Top assemblies Gain access to the following assemblies from the top of the printer: EN control panel laser/scanner unit face-down output assembly Top assemblies 245
Control panel 1 Remove the top cover assembly (see page 232). 2 Turn the cover upside down. 3 Remove four screws attaching the control panel to the top cover (callout 1). 2 2 1 Figure 97. Bottom of the control panel 4 Remove three screws from the bar on the bottom of the control panel that is holding the wires in place (callout 2). 5 Release the cable stays. 6 Remove the assembly.
Laser/scanner unit 1 Remove the top cover assembly (see page 232). 2 On HP Color LaserJet 8550 printer models, remove four screws, two on each side (callout 1 shows two of them), from the laser/ scanner shield and lift the shield out of the printer (the shield is not present on HP Color LaserJet 8500 printer models). 2 1 Figure 98.
3 Remove four screws (callout 1) from the laser/scanner unit. 2 1 2 Figure 99. Scanner unit 4 Release the wires from the cable stay. 5 Unplug the two connectors (callout 2). 6 Gently remove the laser/scanner unit and place it in an ESD pouch.
Face-down output assembly 1 Remove the top cover assembly (see page 232). 2 Remove the left rear cover (see page 234). 3 Remove the left upper cover (see page 236) 4 On the top of the printer, remove the black airflow vent by releasing the cut tab (callout 1) and lifting the vent off. 2 1 Figure 100. Upper airflow vent 5 Remove two screws on the face-down exit sensor rail (callout 2). 2 3 2 Figure 101.
7 Pull the rail away from the chassis. 8 Remove two screws (callout 4). 2 4 Figure 102. Face-down output assembly 9 Lift the right side of the assembly, slide the assembly to the left, and lift it out of the chassis.
Front assemblies Gain access to the following assemblies from the front of the printer: toner lock sensor color cartridge sensor subrelay PCA Toner lock sensor and color cartridge sensor 1 Remove the inside left panel (see page 230). 2 Remove one screw on the toner lock sensor (callout 1). 2 2 1 2 3 2 4 Figure 103. EN Toner lock sensor and color cartridge sensor 3 Remove one connector (callout 2). 4 Remove one screw on the color cartridge sensor (callout 3).
Subrelay PCA 1 Remove the inside left panel (see page 230). 2 Remove the five connectors on the subrelay PCA (callout 1). 3 Remove four screws on the subrelay PCA (callout 2). 2 2 1 Figure 104.
Left assemblies Gain access to the following assemblies from the left side of the printer: formatter board internal printer hard disk feeder assembly face-up solenoid face-up exit assembly Multi-bin mailbox/3,000-sheet stapler/stacker/ 3,000-sheet stacker Remove the paper output accessory before beginning repairs on the left side of the printer. EN 1 Turn the printer off and unplug the power cable. 2 Unplug the paper output accessory power cable from the printer.
Formatter board If the formatter board needs to be repaired or replaced, remove the hard drive and retain it to reattach to the formatter board later. 1 Print a configuration page if the printer is able to generate one (see page 415). Use this page to reset the NVRAM values that will be lost if the formatter board is replaced. 2 Loosen the two finger screws (callout 1). 2 1 Figure 105. Formatter board 3 Pull the formatter board out of the formatter pan.
Notes about reinstalling: After reinstalling the formatter board, print a configuration page to compare with the configuration page printed before the formatter board was removed. Look at the following NVRAM values, and reset the NVRAM values to match those on the configuration page that was printed before the formatter board was removed.
Internal printer hard disk (DN model) If the internal printer hard disk needs to be repaired or replaced, all data stored on the hard disk will be lost. Download fonts and other information as necessary. 1 Remove the formatter board from the printer (see page 254). 2 Unplug one connector (callout 1). 2 1 Figure 106. Connector on formatter board 3 On the other side of the formatter board, release the two tabs with your fingers (callout 2). 2 Figure 107.
Feeder assembly The feeder assembly is located inside the left upper door. 1 Open the front door, and the left lower cover. 2 Remove the left rear cover (see page 234). 3 Remove the left upper cover (see page 236). 4 Remove six screws (callout 1). 2 1 Figure 108. Feeder assembly 5 Lift the feeder assembly up and out. Notes about reinstalling: EN Verify that the gears on the left mesh together on both the top and the bottom of the assembly.
Face-up solenoid The face-up solenoid is below the carousel stop. 1 Remove the feeder assembly (see page 257). 2 Remove the face-up output bin. 3 Remove the formatter board and formatter pan (see page 254 and page 272). 4 Remove one screw inside the back of the printer (callout 1). 2 3 2 1 Figure 109.
5 Lift the face-up solenoid up to release the tab and pull out to remove the solenoid (callout 2). 2 Figure 110. Face-up solenoid (2 of 2) Notes about reinstalling: EN Ensure that the plastic arm from the solenoid is engaged under the delivery drive swing arm (callout 3, figure 109).
Face-up exit assembly The face-up exit assembly is located on the left lower cover. 1 Remove the left lower cover (see page 237). 2 Remove six screws (callout 1). 2 1 Figure 111. Screws on the face-up exit assembly 3 Remove the stopper hinges by popping the peg out of the door assembly. 4 Lift the assembly out. Notes about reinstalling: The larger peg on the stopper hinge fits into the assembly.
Right assemblies Gain access to the following assemblies from the right side of the printer: tray 1 pick-up roller registration roller assembly density sensor paper pick-up assembly tray 1 pick-up assembly paper photo sensors Tray 1 Tray 1 is part of the right upper door. Take the tray off and save it if you are replacing the whole assembly. The new assembly does not include the tray. 1 Open the tray out about 45-degrees. 2 1 Figure 112.
Pick-up roller The pick-up roller is located on the tray 1 pick-up assembly. 1 Open the right upper door. 2 Rotate the roller cover back off of the roller. 3 Squeeze the tabs on the roller and pull to the left to remove the roller (callout 1). 2 1 2 Figure 113. Pick-up roller Note The figure above shows the inside of an HP Color LaserJet 8500 printer. The black plastic piece (callout 2) is eliminated on HP Color LaserJet 8550 printer models.
Registration roller assembly The registration roller assembly is located inside the right upper door under the transfer belt. 1 Open the front door and the right upper door. 2 Remove the transfer drum. 3 Remove the transfer belt. 4 Lift the paper diverter and remove two screws (callout 1). 2 1 Figure 114.
5 Hint Remove two screws on the back of the assembly (callout 2). You might need to use a shorter screwdriver to get the back screws out. 2 Figure 115.
6 Release and remove the cover over the connectors on the right side of the registration roller assembly. 7 Unplug the innermost connector on the right side (callout 3). 2 3 Figure 116. Connectors on registration roller assembly 8 Remove one screw from the green knob on the front of the printer and remove the knob. 9 Pull the registration roller assembly out. Notes about reinstalling: When you replace the registration roller assembly, make sure the gears mesh or you could cause scarring.
Density sensor The density sensor is located on the right upper door. 1 Open the right upper door. 2 With a flat screwdriver, release the six tabs on the sensor cover (callout 1). 2 2 1 Figure 117. Density sensor 3 Remove three screws from the sensor (callout 2). 4 Unplug one connector and remove the sensor.
Paper pick-up assembly The paper pick-up assembly is located inside the right upper cover assembly. 1 Remove trays 2 and 3. 2 Remove the right upper cover assembly (see page 238). 3 Remove the right lower cover assembly (see page 242). 4 Remove four screws, one in each corner of the paper pick-up assembly (callout 1) and pull the assembly out approximately 5 cm (2 in). 2 1 Figure 118.
Tray 1 pick-up assembly The tray 1 pick-up assembly is located on the right upper door. 1 Open the right upper door. 2 Remove the screw on the right side of the assembly (callout 1). . 2 2 1 Figure 119. Tray 1 pick-up assembly (1 of 2) 3 Remove the cover on the right side of the assembly (callout 2).
4 Note Unplug the four connectors on the right side (callout 3). Two connectors are plugged into the controller board, and two connectors are inline connectors. It might be easier to disconnect the connectors from the rear of the printer and pull the wires through the printer frame than to unplug the connectors from the right upper door. . 2 3 2 4 2 3 Figure 120. EN Tray 1 pick-up assembly (2 of 2) 5 Remove four screws (callout 4). 6 Release two clips and lift the assembly off.
Rear assemblies 2 1 2 7 2 2 8 2 9 2 3 2 4 2 10 2 5 2 11 2 6 2 12 2 13 Figure 121.
2 1 2 4 2 2 5 2 3 Figure 122. EN Rear of printer with formatter pan removed 1 Delivery drive assembly 2 Lower air duct 3 Main motor (M4) The main relay PCA is behind the high-voltage power supply. The tray 2 and tray 3 media size sensing PCAs are located behind the power supply. 4 Separation discharge highvoltage converter PCA 5 Separation discharge highvoltage converter The main gear assembly is behind the developer/imaging drum bias supply.
Formatter pan 1 Remove the rear cover (see page 243). 2 Remove the formatter board from the formatter pan (see page 254). 3 On the back of the printer, remove two screws on the top and three on the bottom of the pan (callout 1). 2 1 Figure 123.
4 Remove five screws on the left side of the printer (callout 2). 2 Figure 124. Formatter pan (left side) 5 EN Pull the formatter pan off.
Fan 1 Fan 1 is located on the middle right side of the rear of the printer. For information about removing the fan 1 housing, see page 283 (steps 4 through 6). 1 Remove the rear cover (see page 243). 2 Unplug the fan connector from the PCA (callout 1). 2 1 2 Figure 125. 2 3 Fan 1 3 Push out on the two tabs on the left and right sides of the fan housing (callout 2). 4 Pull the thermistor out (callout 3). 5 Pull the fan out.
Fan 2 Fan 2 is located on the upper right side of the rear of the printer. For information about removing the fan 2 housing, see page 283 (steps 7 through 8). 1 Remove the rear cover (see page 243). 2 Unplug one connector (callout 1). 2 2 1 Figure 126. EN Fan 2 3 Push out on the tabs on the left and right sides of the fan housing to release the fan (callout 2). 4 Pull the fan out.
Power supply The power supply is located on the lower right side of the rear of the printer. 1 Remove the rear cover (see page 243). 2 Remove the formatter board and formatter pan (see page 254 and page 272). 3 Unplug the five connectors. 4 Release one cable stay. 5 Remove five screws (two in the top, one on the left, two on the right) (callout 1). 2 1 Figure 127. Power supply 6 Lift the power supply out of the chassis.
Controller board The controller board is located on the lower left side of the rear of the printer. Shown in figure 128 is a controller board in an HP Color LaserJet 8550 MFP printer and includes the ECO board cable (callout 1). Compare the controller board to the same part from an HP Color LaserJet 8500 printer, in figure 129 on page 278. 2 1 Figure 128.
Removing the controller board Hint 1 Print a configuration page if the printer is able to generate one (see page 415). This page can be used to reset the page count values that will be lost if the controller board is replaced. 2 Remove the rear cover (see page 243). 3 Remove the formatter board and formatter pan (see page 254 and page 272). 4 Unplug 25 connectors. All 25 connectors are keyed. Also, it is easier to unplug the connectors before removing the screws from the PCA.
ECO board The ECO board is located on the lower left side of the rear of the printer, below the controller board, on HP Color LaserJet GN printer models. 1 Remove the rear cover (see page 243). 2 Remove the formatter board and formatter pan (see page 254 and page 272). 3 Unplug the ECO board connector (callout 1). 2 Figure 130. ECO board 4 Note EN 2 1 Remove two screws (callout 2) to release the ECO board.
Cartridge motor (M3) This motor is located to the left of fan 1. 1 Remove the rear cover (see page 243). 2 Unplug one connector (callout 1). 2 1 2 Figure 131. Cartridge motor 3 Remove four screws on the motor (callout 2), and pull the motor out.
Main motor (M4) This motor is located to the right of the controller board, behind the formatter pan. 1 Remove the rear cover (see page 243). 2 Remove the formatter board and formatter pan (see page 254 and page 272). 3 Unplug one connector. 4 Remove four screws (callout 1), and pull the motor away from the chassis. 2 1 Figure 132.
Carousel motor PCA This PCA is located on the upper right side of the rear of the printer. 1 Remove the rear cover (see page 243). 2 Unplug six connectors. 3 Remove one screw (callout 1). 2 2 1 Figure 133. Carousel motor PCA 4 Release three tabs from the PCA (callout 2). 5 Lift the PCA out.
Carousel motor (M1) The carousel motor is located behind the fan 1 housing. 1 Remove the top cover assembly (see page 232). 2 Remove the rear cover (see page 243). 3 Remove the formatter board and formatter pan (see page 254 and page 272). 4 Remove five screws from the sheet metal cover plate and lift it off. 5 Remove four screws from the fan 1 assembly (callout 1). 2 3 2 4 2 2 1 Figure 134.
9 On the right side of the carousel motor, unplug one connector (callout 5). 2 6 2 5 Figure 135. Carousel motor 10 Remove four screws from the motor and lift it out (callout 6).
Delivery drive assembly The delivery drive assembly is located behind the fan 1 housing and the formatter pan. 1 Remove the carousel motor PCA (see page 282). 2 Remove fan 1 housing (see page 283, steps 4 through 6). 3 Remove two screws (callout 1) from the lower air duct and remove the lower air duct (callout 2). 2 1 Figure 136.
4 Release three cable stays on the bottom of the delivery drive assembly. 5 Remove one screw (callout 3) and the gear cover. 2 4 2 5 2 3 Figure 137. Screws on the delivery drive assembly 6 Remove seven screws from the delivery drive assembly (callout 4). 7 Lift the assembly up and off the tabs. Notes about reinstalling: Ensure that the metal swing arm is above the face-up solenoid (callout 5).
Main gear assembly (not shown) 1 Open the left lower cover and remove the fuser. 2 Open the right upper door and remove the transfer drum. 3 Remove the registration roller assembly (see page 263). 4 Remove the paper pick-up assembly (see page 267). 5 Remove the main motor (M4) (see page 281). 6 Remove the lower air duct (see figure 136 on page 285). 7 Remove the lowest gear (callout 1) on the delivery drive assembly (three screws and one e-ring). 2 1 2 Figure 138.
Post charger HV module assemblies The post charger HV module assemblies are located on the midupper of the rear of the printer. Shown in figure 139 below are the assemblies in an HP Color LaserJet 8550 printer. Compare the developer/imaging drum bias supply to the same part from an HP Color LaserJet 8500 printer, in figure 140 on page 289, callouts 1 (the smaller portion) and 2 (the larger portion).
Removing developer/imaging drum bias supply 1 Remove the top cover assembly (see page 232) and then remove the rear cover (see page 243). 2 Remove five screws from the sheet metal cover plate and lift it off. 3 Unplug four connectors (callout 3). 2 3 2 1 2 5 2 2 4 2 3 Figure 140. EN Developer/imaging drum bias supply 4 Release two cable stays. 5 Remove two screws on the bottom of the PCA housing (callout 4). 6 Remove one screw on the PCA (callout 5). 7 Lift the PCA up and off.
Removing post charger HV module 1 Remove the high-voltage power supply (see page 291). 2 Remove one screw to release the wire from the open ended diode (callout 1, screw is hidden from view). 2 2 1 Figure 141. Post charger HV module 3 Release two cable stays. 4 Remove one screw on the top of the module (callout 2). 5 Lift the module up and out.
Cleaning roller HV module assemblies The cleaning roller HV module includes two PCAs stacked on top of each other and is located on the upper left side when facing the rear of the printer. Removing high-voltage power supply 1 Remove the rear cover (see page 243). 2 Remove the formatter board and formatter pan (see page 254 and page 272). 3 Remove the controller board (see page 277). 4 Unplug six connectors from the PCA (callout 1). 2 1 2 2 2 1 Figure 142.
Notes about reinstalling: Seat the bottom of the PCA first by placing the tabs in the corresponding holes. When putting the PCA back in, be sure you do not get any wiring caught behind it. Removing cleaning roller HV module 1 Remove the rear cover (see page 243). 2 Remove the formatter board and formatter pan (see page 254 and page 272). 3 Unplug two connectors (callout 1). 2 2 1 Figure 143. Cleaning roller HV module 4 Release two cable stays.
Main relay PCA This PCA is located behind the developer/imaging drum bias supply. 1 Remove the rear cover (see page 243). 2 Remove five screws from the sheet metal cover plate and lift it off. 3 Remove the developer/imaging drum bias supply (see page 291). 4 Unplug eight connectors (callout 1). 2 2 1 2 2 3 Figure 144. Main relay PCA 5 Note Take note of where the interlock tabs come out of their casing so that you can reinstall them correctly (callout 3). 6 EN Remove two screws (callout 2).
Drum/cartridge drive assembly This assembly is behind the high-voltage power supply assembly. 1 Remove the post charger HV module (see page 290). 2 Remove the cleaning roller HV module and the high-voltage power supply (see page 289). 3 Remove the fan 1 housing (see page 283, steps 4 through 6). 4 Release three cable stays. 5 Remove 12 screws (callout 1). 2 2 1 Figure 145. Drum/cartridge drive assembly 6 Lift the assembly up and out.
Separation discharge high-voltage converter assemblies The separation discharge high-voltage converter assemblies are located in the bottom right corner of the rear of the printer. Removing separation discharge high-voltage converter PCA 1 Remove the rear cover (see page 243). 2 Remove the formatter board and formatter pan (pages 254, 272). 3 Unplug three connectors from the PCA (callout 1). 2 2 1 Figure 146. Separation discharge high-voltage converter 4 Release one cable stay.
Tray 2 and tray 3 media-size sensing PCAs 1 Remove the rear cover (see page 243). 2 Remove the formatter board and formatter pan (see page 254 and page 272). 3 Remove the power supply (see page 276). 4 Release one cable stay. 5 Remove one screw (callout 1) from the plate and remove the plate. 2 1 Figure 147.
6 Open the corresponding tray. 7 Remove three screws (callout 2) and unplug one connector on each PCA to remove. 2 1 Figure 148. Media size sensing PCAs Note The two PCAs and wire-sensing finger assemblies are interchangeable.
2,000-sheet input unit You do not have to detach the 2,000-sheet input unit from the printer to service any of the units.
Front cover 1 Open tray 4 to the stops. 2 Remove the paper limit-back plate from the tray (callout 1). . 2 1 2 2 3 Figure 149. Front cover of the 2,000-sheet input unit 3 Remove four screws (callout 2). 4 Use a flat-blade screwdriver to release the plastic retaining tabs on the left- and right-front sides of the tray (callout 3). 5 Carefully lift up on the front cover, and then pull it out to release the plastic retaining tabs that secure the bottom of the front cover to the tray chassis.
Back cover 1 Unplug the power cord and the C-link interface cables from the 2,000-sheet input unit. 2 Remove four screws (callout 1). 2 1 Figure 150. Back cover removal 3 Pull the cover back from the chassis. Notes about reinstalling: Make sure the tab on the lower-left corner is inserted into its alignment slot.
Left cover 1 Unplug the power cord and the C-link interface cables from the 2,000-sheet input unit. 2 Remove two screws (callout 1). 2 1 2 Figure 151. Left cover removal 3 Pull out on the top of the cover, and then lift up on the right side of the cover to clear the retaining tabs that are along the bottom edge (callout 2). 4 Pull out on the lower-left corner to release the plastic retainer tab that secures that corner of the cover to the chassis.
Vertical transfer unit Remove the VTU to access the left side of the unit and the paper path mechanisms. WARNING! 1 Unplug the power cord and the C-link interface cables from the 2,000-sheet input unit. 2 Open the VTU. 3 Rotate the two plastic safety catches on the VTU hinges towards the unit to the “open” position (callout 1). Do not release the safety catches from the “open” position while the VTU is removed. The springs on the safety catches are very strong and can cause injury.
5 Remove two screws, one on the inner side of each safety catch. 6 Pull the door halfway closed, then lift the unit straight up to clear the metal locating tabs on the chassis. Notes about reinstalling: WARNING! EN Before tightening the screws, ensure that the metal locating tabs are in place. Release the safety catches only after tightening the screws that secure the VTU to the chassis.
Right cover 1 Remove the VTU (see page 302). 2 Remove two screws near the middle of the right cover (callout 1). 2 2 1 Figure 153. Right cover with VTU removed 3 Using a flat-blade screwdriver, release the plastic retaining tab on the upper-left corner of the cover (callout 2). 4 Carefully pull out on the top of the cover while lifting it upward to clear the retaining tabs that are along the cover’s bottom edge.
Tray 4 1 Open tray 4 and remove any paper. 2 Remove the vertical transfer unit (VTU) (see page 302). 3 Remove the left and right covers (see page 301 and page 304). 4 Remove one screw and one metal retaining tab from each side of the chassis (callout 1). 2 1 Figure 154. Tray 4 removal 5 EN Support the rear of the tray while sliding it straight out of the chassis.
Paper pick-up assembly The paper pick-up assembly is located on the right side of the unit. 1 Remove the VTU (see page 302). 2 Remove the right cover (see page 304). 3 Open tray 4 to the stops. 4 Unplug three connectors (callout 1). 2 2 1 Figure 155. Paper pick-up assembly 5 Remove five screws (callout 2). 6 Slide the assembly straight out of the chassis.
Controller PCA The controller PCA is located on the back of the unit. 1 Remove the back and left covers (see page 300 and page 301). 2 Unplug 11 connectors (callout 1). 2 4 2 1 2 2 3 2 5 Figure 156. Controller PCA 3 Remove four hex screws from the two C-link cable connectors (callout 2). 4 Remove two screws from the right side of the PCA (callout 3). 5 Release the two plastic retaining posts from the left side of the PCA (callout 4). 6 Pull the PCA out from the chassis.
Front LED PCA assembly 1 Open tray 4 halfway to the stops. 2 On the upper-left corner of the front of the chassis, remove one screw (callout 1). 2 1 Figure 157. Screw on front LED PCA assembly 3 Reach behind the LED PCA assembly and pull it away from the chassis. 4 Release three plastic retaining tabs that secure the LED PCA to the connector (callout 2). 2 Figure 158. Front LED PCA 5 Unplug the LED PCA from the connector.
Power supply 1 Unplug the power cord and the C-link interface cables from the 2,000-sheet input unit. 2 Remove the back and left covers (see page 300 and page 301). 3 Unplug one connector (callout 1). 2 2 1 Figure 159. EN Power supply 4 Remove two screws (callout 2). 5 Lift the power supply upward to clear the locating tabs underneath, and then slide it to the left to free it from the chassis.
Main drive assembly 1 Remove the back cover (see page 300). 2 Unplug one connector from the controller PCA (callout 1). 2 1 2 Figure 160. Note Main drive assembly 3 Release two cable stays. 4 Remove one screw on top of the main drive assembly and one screw on the bottom (callout 2). 5 Pull the main drive assembly away from the chassis. Inspect the paper deck drive bushing on the main drive assembly. If the bushing is broken, it can be replaced without replacing the whole drive assembly.
Paper-size sensor assemblies There are two paper-size sensor assemblies: the quantity switch assembly and the paper-size switch assembly. Removing the quantity switch assembly 1 Remove the back cover (see page 300). 2 Unplug one connector from the controller PCA (callout 1). 2 1 2 2 3 Figure 161. Paper quantity switch assembly 3 Release two cable stays. 4 Remove one screw (callout 2) and the metal retaining spring (callout 3) that hold the assembly in place. 5 Remove the assembly.
Removing the paper-size switch assembly 1 Remove the back cover (see page 300). 2 Unplug one connector from the controller PCA (callout 1). 2 1 2 2 3 Figure 162. Paper size switch assembly 3 Remove one screw (callout 2) and the metal retaining spring (callout 3) that hold the assembly in place. 4 Remove the assembly. Notes about reinstalling: Seat the retaining spring (callout 3) onto the locating pins that are on the chassis.
Tension springs 1 Remove the left cover (see page 301). 2 Open tray 4 to the stops. 3 Inside the tray, remove one spring on the left runner and one spring on the right runner (callout 1). 2 1 Figure 163.
Multi-bin mailbox The following covers and assemblies can be removed from the multibin mailbox: Hint front, back, and top covers power supply paper bins and blind cover flipper assembly delivery head position motor transport belt motor input paper guide controller PCA anti-curl strings delivery head assembly interlock switch diagnostic LED PCA user status LED PCA attachment assembly metallic tape and housing assembly Place the multi-bin mailbox on a table for ease in ser
Front and back covers 1 Remove the multi-bin mailbox from the printer. 2 For each cover, use a small flat-blade screwdriver to release the three retaining tabs that secure the cover to the frame (callout 1). 2 1 2 1 Figure 164. Front and back covers 3 EN Rotate the cover outward to release it from the frame.
Top cover 1 Remove the front and back covers (see page 315). 2 Disconnect the cable from the LED PCA (callout 1, at the upperfront side of the frame). 2 2 1 2 3 Figure 165. Top cover 3 Remove one screw that secures the LED PCA to the frame (callout 2). 4 Remove two screws close to the upper-right side (callout 3). 5 Slide the top cover to the left side of the unit, then lift it up and out of the frame.
Power supply 1 Unplug one connector from the controller PCA (callout 1). 2 2 1 Figure 166. Power supply 2 EN Press the plastic retaining tabs on each side of the power supply to remove it (callout 2).
Paper bins and blind cover The procedure for removing the paper bins and the blind cover is the same. Each bin rests in its labeled slot. Figure 167. 1 Remove the face-up bin first. Lift the outer edge of the bin to clear the retaining notch in the frame, and then pull the bin away from the frame. 2 Remove the blind cover. Paper bins 3 Remove each face-down bin, starting at the top and working down in sequence.
Flipper assembly 1 Remove all paper bins and the blind cover (see page 318). 2 Remove the front, back, and top covers (pages 315, 316). 3 Remove two screws closest to the upper-left side (callout 1). 2 1 2 1 2 3 Figure 168. Flipper assembly (1 of 3) 4 Hold down the jam access door and unplug the ground wire (callout 2). 2 Figure 169.
5 Unplug three connectors (figure 168, callout 3). 6 Use a flat-blade screwdriver to release the plastic retaining tab that secures the assembly to the top of the frame (callout our). 2 4 2 5 Figure 170. Flipper assembly (3 of 3) 7 Hold down the jam access door (callout 5) and pull the assembly out. Notes about reinstalling: CAUTION Hold down the jam access door to reconnect the ground wire to the flipper motor (callout 2).
Delivery head position motor 1 Remove the back cover (see page 315). 2 Unplug one connector (callout 1). 2 2 1 Figure 171. Delivery head motor 3 Remove two screws from the motor (callout 2). 4 Pull the motor away from the frame. Notes about reinstalling: EN Position the motor in the frame so that the cable grommets are face down.
Transport belt motor 1 Remove the back cover (see page 315). 2 Remove all paper bins and the blind cover (see page 318). 3 Release the controller PCA assembly from the bottom of the frame (see page 327, steps 1 through 7). 4 Unplug the J8 connector on the multi-bin mailbox controller PCA (callout 1). 2 2 1 Figure 172. Transport belt motor 5 CAUTION Remove two screws (and washers) on the transport belt motor (callout 2). When removing the motor, do not damage the internal drive belt.
Input paper guide 1 Remove the multi-bin mailbox from the printer. 2 Remove the face-up bin and the blind cover (see page 318). 3 Hold down the jam access door while unplugging the ground wire (callout 1). 2 1 Figure 173.
4 Use a flat-blade screwdriver to release the retaining tabs on the top of the input paper guide (callout 2). 2 Figure 174. 2 3 Input paper guide (2 of 2) 5 Pull the input paper guide free of the frame while routing the ground wire through the wire access hole (callout 3).
Metallic tape and housing assembly 1 WARNING! Remove all paper bins and the blind cover (see page 318). The sharp edges of the metal tape can cause serious injury. When rewinding the metal tape into its housing, hold the tape securely and rewind it slowly. 2 With the delivery head assembly at the top of the multi-bin mailbox, hold the metal tape near the end, and push and release the retainer tab that secures the end of the tape to the top of the frame (callout 1).
5 Use a flat-blade screwdriver to release the plastic retaining tabs located on each side of the tape housing (callout 3). 2 4 2 3 Figure 176. Metallic tape and housing assembly (2 of 2) 6 Gently pull on the delivery head assembly to remove the end of the tape from behind the rollers (callout 4). 7 Pull the tape housing toward you to remove it.
Controller PCA 1 Disconnect the power cable (callout 1). 2 2 1 2 3 Figure 177. 2 3 Controller PCA (1 of 2) 2 Disconnect the C-link cable (callout 2). 3 Remove all paper bins and the blind cover (see page 318). 4 Carefully lay the multi-bin mailbox on its front side. 5 Loosen one grounding screw and two self-tapping screws on the right side of the PCA cover (callout 3). 6 Remove two self-tapping screws and the grounding cable from the left side of the PCA cover (callout 4).
8 Unplug eight connectors (callout 5) and remove the PCA. 2 5 Figure 178.
Anti-curl strings 1 Remove the back cover (see page 315). 2 Remove all the paper bins and the blind cover (see page 318). 3 On the lower-left side of the frame, remove two screws securing the tension springs (callout 1). 2 1 2 Figure 179. EN Anti-curl strings (1 of 2) 4 Remove the anti-curl strings from the lower pulleys (callout 2). 5 Remove the delivery head assembly (see page 331).
6 Release the upper ends of the anti-curl strings from the jam access door by pushing the retaining tabs that secure the strings to the door (callout 3). 2 3 Figure 180.
Delivery head assembly WARNING! 1 Remove the back cover (see page 315). 2 Remove all paper bins and the blind cover (see page 318). The sharp edges of the metal tape can cause serious injury. When rewinding the metal tape into its housing, hold the tape securely and rewind it slowly. 3 With the delivery head assembly at the top of the multi-bin mailbox, hold the metal tape near the end, and release the retainer tab that secures the end of the tape to the top of the frame (callout 1).
5 Release the flat ribbon cable from the cable clip (callout 2), and gently disconnect the cable (callout 3). 2 Figure 182. 2 3 Delivery head assembly (2 of 4) 6 Raise the assembly to the top of the frame. 7 Hold up the assembly and remove two screws (callout 4). 2 4 Figure 183. Delivery head assembly (3 of 4) Note The screw that secures the back end is captive.
8 Rotate the assembly clockwise while guiding the back end out of its access opening (see figure 184). 9 Release the anti-curl strings from the pulleys on each end of the assembly (callout 5). 2 5 Figure 184. Delivery head assembly (4 of 4) Notes about reinstalling: EN When reinstalling the assembly onto its elevator mounts, ensure that the locating pins are in place. Ensure that the assembly moves up and down freely.
Interlock switch 1 CAUTION Remove the back cover (see page 315). Before removing the wires from the multi-bin mailbox interlock switch, note the location of each wire. Replacing the wires incorrectly can damage the interlock switch. 2 Disconnect two wires from the switch (callout 1). 2 Figure 185. 2 1 Interlock switch 3 Press the two retaining tabs together to remove the switch (callout 2).
Diagnostic LED PCA 1 Remove the back cover (see page 315). 2 Unplug two connectors from the PCA (callout 1). 2 1 2 Figure 186. EN Diagnostic LED PCA 3 Remove one screw (callout 2). 4 Pull the PCA away from the frame.
User status LED PCA 1 Remove the front cover (see page 315). 2 Disconnect the cable from the PCA (callout 1). 2 1 2 Figure 187. User status LED PCA 3 Remove one screw (callout 2). 4 Pull the PCA away from the frame.
Attachment assembly 1 Remove the controller PCA, but leave cables connected (see page 327). 2 Set the controller PCA on top of the unit (callout 1). 2 1 2 Figure 188. EN Attachment assembly 3 Remove the e-ring (callout 2). 4 Release the pivot pin that holds the attachment assembly rod to the frame. 5 Remove the assembly.
3,000-sheet stapler/stacker and 3,000-sheet stacker The following covers and assemblies can be removed from the 3,000sheet stapler/stacker and 3,000-sheet stacker: face-up and stapler/stacker bins front, back, and foot covers 1 2 stapler door assembly with label1/stacker door assembly2 controller PCA cover flipper assembly carriage assembly1 accumulator assembly1 stapler1 controller PCA LED PCA power supply interlock switch safety switch assembly attachment assembly
Bins and covers Face-up bin CAUTION 1 Lift slightly the end of the bin (callout 1). 2 Pull the bin away from the product (callout 2). When replacing the bin, make sure you position it under the bin-full flag (callout 3). Placing it over the bin-full flag and then attempting to force the bin into its slots can damage the flag. Stapler bin/stacker bin 1 Unhook the plastic tabs underneath the bin (callout 4). 2 Carefully lift the bin straight up until it is released from the frame.
Back cover 1 Use the TX-20 screwdriver to remove three screws (callout 2). 2 Press and hold in the interlock switch (callout 3) while lifting the cover straight up until the cover is released from the product. 2 3 2 2 1 Figure 190.
Foot cover Figure 191. 1 Remove the front and back covers. 2 Grasp the foot cover on one side, rotate it out slightly, and then lift it up to clear the locating pin. Repeat this step for the opposite side of the foot cover. 3 Lift up the cover and pull it away from the product. Foot cover removal To reinstall The cover can be difficult to replace correctly. Make sure you line up the ridges on the bottom of the cover with the grooves on the product.
Stapler door assembly with label/stacker door assembly Note 1 Open the door assembly and, on a stapler/stacker, center the stapler unit. 2 Use the TX-20 screwdriver to remove two screws (callout 1) from inside the door, one at the front and one at the back of the device. The screws remain attached to the plastic screw holders. 3 Rotate the door down until the flat sides of the hinges are parallel to the floor and pull the door straight away from the product.
Internal assemblies Flipper assembly 1 Remove the front and back covers. 2 At the back of the product, disconnect the flipper ribbon cable (callout 1) by pressing the black tabs on the connector to release the cable. 3 Use the TX-20 screwdriver to remove four screws (callout 2), two on each side of the assembly. 2 2 1 Figure 193. Flipper assembly removal (1 of 2) Note Sheet-metal edges may be sharp.
4 Use both hands to grasp the assembly on each side and, with a firm tug, lift the assembly straight up to clear the tabs (callout 1; one of the two tabs is shown) on each side of the assembly. 5 Pull the assembly straight away from the product, being careful of the bin-full flag. 2 1 Figure 194.
Carriage assembly (stapler/stacker only) 1 Remove the front cover, the back cover, and the controller PCA cover. 2 Disconnect the ribbon cable (callout 1) from the controller PCA by pressing the black tabs to release the cable. 2 1 Figure 195. Carriage assembly removal (1 of 2) 3 EN Push the ribbon cable up through the hole.
4 Use the TX-20 screwdriver to remove two screws (callout 1), one on each side of the assembly. 5 Lift the assembly to clear the tabs on each side of the assembly and pull the assembly straight away from the frame. 2 1 Figure 196.
Accumulator assembly (stapler/stacker only) 1 Note Remove the front cover, the back cover, the controller PCA cover, the flipper assembly, and the carriage assembly. While it is possible to remove the accumulator assembly without first removing the carriage assembly, HP strongly recommends that the carriage assembly be removed before removing the accumulator assembly. Otherwise, you might find it very difficult to reposition the accumulator assembly with the carriage assembly in the way.
4 Use the TX-20 screwdriver to remove four screws (callout 1), two on each side of the assembly. 2 1 Figure 198. Accumulator assembly removal (2 of 2) 5 Lift the accumulator assembly up to clear the tabs at each side and rotate the top of the assembly down while pulling it away from the product.
Offset module (stacker only) 1 Remove the front cover, the back cover, the controller PCA cover, and the flipper assembly. 2 Disconnect the ribbon cable (callout 1) from the controller PCA by pressing the black tabs to release the cable. 3 Push the ribbon cable up through the hole. 4 Use the TX-20 screwdriver to remove four screws (callout 2), two on each side of the module. 2 2 1 Figure 199.
Stapler (stapler/stacker only) Figure 200. 1 Remove the carriage assembly from the 3,000-Sheet stapler/ stacker and place it on a work surface. 2 Remove the staples cartridge from the stapler. 3 Disconnect the cable from its connector and unthread the cable from the cable guides.
Note 4 Use the TX-10 screwdriver to remove the grounding screw (callout 1) and release the grounding cable. 5 Use the TX-20 screwdriver to remove two screws and their washers (callout 2) from the stapler. Keep the washers with the screws to make sure they are reinstalled. 2 1 2 Figure 201. Stapler removal (2 of 3) Note The stapler is affixed tightly to the carriage assembly.
7 Note Lift the stapler away from the carriage. In the figure below, the stapler has been removed from the carriage assembly and is rotated to show the tabs (callout 1) and tab slots (callout 2). 2 2 1 Figure 202. Stapler removal (3 of 3) To reinstall Place the tabs in the tab holes and use firm pressure to slide the stapler toward the screws side of the stapler, lining up the screw holes. Do not attempt to replace the screws until the screw holes are lined up.
Controller PCA 1 Remove the controller PCA cover. 2 Release the seven cables, including the C-link cable, from their connectors (callout 1) on the stapler/stacker controller PCA. 3 Use the TX-20 screwdriver to remove three screws (callout 2). 2 2 2 1 2 3 Figure 203. Stapler/stacker controller PCA or stacker controller PCA removal Note You might have to squeeze the three locating pins to allow the holes on the controller PCA to clear the pins. 4 Pull the controller PCA from the product.
LED PCA 1 Remove the front cover. 2 Use the TX-10 screwdriver to remove one screw (callout 1) from the LED PCA. 3 Disconnect the cable (callout 2) to release the LED PCA. 2 1 2 Figure 204.
Power supply 1 Remove the controller PCA cover. 2 Unplug the power cable (callout 1) from the power supply. 3 Disconnect the cable from the controller PCA (callout 2). 4 Use the TX-20 screwdriver to remove one screw (callout 3) from the bracket that holds the power supply in place. 2 2 1 Figure 205. Power supply removal 5 EN 2 3 Lift the bracket and the power supply out and away from the product.
Interlock switch 1 Remove the back cover. 2 Disconnect two cables (callout 1) from the interlock switch. 3 Squeeze the interlock switch on the top and bottom (callout 2), and slide the interlock through the hole (callout 3). 2 2 3 2 1 Figure 206.
Safety switch assembly 1 Remove the front cover, the back cover, and the carriage assembly. 2 Press the two tabs on the sides of the safety switch assembly cover (callout 1) to release it from the frame and lift the cover away from the assembly. 3 Disconnect two cables (callout 2) from the safety switch assembly. 4 Press the tabs on the bottom of the safety switch assembly (one tab on each side—callout 3) to release it from the frame and lift the assembly away from the product.
Attachment assembly (rod, bracket, cables) 1 Unplug the attachment assembly’s C-link cable from the controller PCA and power cable from the power supply. 2 Use the TX-20 screwdriver to remove four screws (callout 1) from the attachment assembly. 3 Guide both cables through the hole and pull the assembly away from the product. 2 1 Figure 208.
Flipper ribbon cable 1 Remove the back cover and the controller PCA cover. 2 Disconnect the cable (callout 1) at both ends by pressing the black tabs on the connectors. 3 Open the three cable clips (callout 2; two of the three cable clips are shown) to release the cable. 2 1 2 Figure 209.
Stationary caster 1 Remove front or back cover, depending upon the caster you want to replace. 2 Lay the stapler/stacker on its front or back side so that the caster being replaced is off the floor. 3 Use the TX-20 screwdriver to remove one screw (callout 1) from the inside of the frame. 4 Rotate the caster 90° to clear the tabs and pull the caster away from the product. 2 1 Figure 210.
Adjustable caster 1 Remove the front cover, the back cover, and the foot cover. 2 Lay the stapler/stacker on its front or back side so that the caster being replaced is off the floor. 3 Use a flat blade screwdriver to snap the e-clip off of the adjusting knob (callout 1). 2 1 Figure 211. Adjustable caster removal 4 EN Slide the caster out of its position.
362 Chapter 6 - Removal and replacement EN
7 Troubleshooting Chapter contents Pre-troubleshooting checklist . . . . . . . . . . . . . . . . . . . . . . . 367 Printer message troubleshooting. . . . . . . . . . . . . . . . . . . . . 368 Aids to troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 415 Configuration page . . . . . . . . . . . . . . . . . . . . . . . . . . 415 Continuous configuration page . . . . . . . . . . . . . . . . . 418 Demonstration page . . . . . . . . . . . . . . . . . . . . . . . . . 418 Event log . . . .
Image defects troubleshooting . . . . . . . . . . . . . . . . . . . . . . 441 Image orientation. . . . . . . . . . . . . . . . . . . . . . . . . . . . 441 Image defect examples . . . . . . . . . . . . . . . . . . . . . . . 442 Developer streak . . . . . . . . . . . . . . . . . . . . . . . . . . . . 453 Color-plane registration . . . . . . . . . . . . . . . . . . . . . . . 452 Rain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 453 Toner bubbles . . . . . . . . . . . . . . . . .
Multi-bin mailbox troubleshooting . . . . . . . . . . . . . . . . . . . . 477 Switching the multi-bin mailbox to test mode. . . . . . . 477 Power-up sequence test . . . . . . . . . . . . . . . . . . . . . . 478 Paper path test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 478 Multi-bin mailbox LED descriptions . . . . . . . . . . . . . . 479 3,000-sheet stapler/stacker troubleshooting . . . . . . . . . . . . 482 Calibrating the staple position . . . . . . . . . . . . . . . . . .
366 Chapter 7 - Troubleshooting EN
Pre-troubleshooting checklist Before troubleshooting any specific printer problem, make sure that the following conditions are met: Note EN l Remove the printer from the network before beginning troubleshooting to make sure that the failure is not associated with the network. For HP Color LaserJet 8550 MFP printers, compare printed pages to copied pages to determine whether the problem is a print engine problem or a copy problem.
Printer message troubleshooting This section contains explanations and recommended actions for messages that appear on the printer control panel. Note l Numbered messages — table 41 (beginning on this page) l Unnumbered messages (in alphabetical order) — table 42 (beginning on page 388) The action field for each control panel message describes the steps to resolve the message. Each step is a self-contained resolution for the message; however, the steps should be followed in order. Table 41.
Table 41. Numbered printer messages (continued) 13.00.07 (event log message) Two-sided turnaround paper late jam See CLEAR DUPLEX JAM LOWER LEFT DOOR in table 42 on page 390. 13.00.08 (event log message) Two-sided turnaround paper stopped jam See CLEAR DUPLEX JAM LOWER LEFT DOOR in table 42 on page 390. 13.00.09 (event log message) Two-sided path paper late jam See CLEAR DUPLEX JAM LOWER LEFT DOOR in table 42 on page 390. 13.00.
Table 41. Numbered printer messages (continued) 13.22.01, 13.22.02 (event log messages) Multi-bin mailbox jam See CLEAR MAILBOX JAM in table 42 on page 392. 13.22.03 (event log message) Multi-bin mailbox jam See CLEAR MAILBOX JAM in table 42 on page 392. 13.22.04 (event log message) Multi-bin mailbox jam See CLEAR MAILBOX JAM in table 42 on page 393. 13.22.05 (event log message) Multi-bin mailbox jam See CLEAR MAILBOX JAM in table 42 on page 393. 20 INSUFFICIENT MEMORY Event log message: 20.00.
Table 41. Numbered printer messages (continued) 30.00.01 (event log message) Hard disk internal self-test routine failure detection See DISK DEVICE FAILURE in table 42 on page 396. 40. HP EIO ERROR Event log message: 40.00.00 Description: An EIO accessory connection has been abnormally broken while transferring data from the computer to the printer. Action: = EIO slot number 1 = Bottom EIO slot 2 = Top EIO slot 1 Press GO.
Table 41. Numbered printer messages (continued) 41.3 UNEXPECTED PAPER SIZE LOAD TRAY 1 Event log message: 41.00.03 Description: Tray 1 is configured for a specific media size, but the printer detects a different size being fed from tray 1. For example, the printer was expecting a lettersized page but detected that an 11-by-17 inch-sized page was fed instead.
Table 41. Numbered printer messages (continued) 49. ERROR CYCLE POWER Event log message: 49. Description: Indicates that a software or data communications error has occurred, or corrupt data was sent to the printer. This can be caused during times of high network traffic or by incomplete or out-of-bounds print data. This error can also occur because of defective EIO devices. Action: 1 Verify that all cables are connected. 2 Turn the printer off and on to reset the printer.
Table 41. Numbered printer messages (continued) 50.3 FUSER ERROR CYCLE POWER Event log message: 50.00.03 Action: Description: Indicates that a high temperature error has occurred 1 Turn the printer off and on to reset the printer. in the fuser. This error is saved in the controller 2 Turn the printer off and unplug it. Place a flat board by an electrical charge in capacitor C259. blade of a screwdriver between the two wires of C259 to short out the capacitor and clear the memory. 3 Replace the fuser kit.
Table 41. Numbered printer messages (continued) 51 LASER ERROR CYCLE POWER Event log message: 51.00.01 Description: Indicates that a laser malfunction has occurred. Action: 1 Turn the printer off and on to reset the printer. 2 Reconnect connector J1001 on the laser driver PCA and connector J205 on the controller board. 3 Reconnect connector J2 on the beam detect PCA, relay connector J40, and connector J211 on the controller board. 4 If the problem persists, replace the laser/ scanner unit.
Table 41. Numbered printer messages (continued) 53.. ERROR DIMM SLOT Event log message: 53.. Description: Indicates that a memory error occurred during the configuration and validation of DIMM memory. Action: 1 Verify that the DIMM board is installed correctly and the DIMMs are configured correctly. DRAM DIMMs must be installed in synchronous pairs in adjacent slots, with the same size and speed in both slots. Only SDRAM is supported.
Table 41. Numbered printer messages (continued) 54.1 TEMPERATURE SENSOR ERROR CYCLE POWER Event log message: 54.00.01 Description: Indicates that the temperature/humidity sensor in the printer has malfunctioned. The temperature/ humidity sensor is located below tray 2. Action: 54.2 CAROUSEL ERROR CYCLE POWER 1 Reconnect connector J801 and relay connector J55 on the temperature/humidity sensor, and connector J206 on the controller board.
Table 41. Numbered printer messages (continued) (54.2 CAROUSEL ERROR CYCLE POWER, continued) 8 Check electrical continuity between connector J642-1 (PYMC) and J642-2 (PBK) on the subrelay PCA when the door switch (SW673) is turned on. If there is no electrical continuity, replace the toner cartridge cover switch in the subrelay PCA. 9 Check electrical continuity between connector J642-1 (PYMC) and J648-1 (+24 VAR) on the main relay PCA when the door switch (SW642) is turned on.
Table 41. Numbered printer messages (continued) 54.4 WASTE TONER SENSOR ERROR CYCLE POWER Event log message: 54.00.04 Description: The waste toner sensor has failed. Printing cannot continue. Action: 1 Replace the waste toner sensor assembly. 2 Replace the imaging drum. 54.00.05 (event log message) Sensor abnormality. See CLEAN DENSITY SENSOR CYCLE POWER in table 42 on page 389. 54.00.06 (event log message) Out of range cyan. See CLEAN DENSITY SENSOR CYCLE POWER in table 42 on page 389. 54.00.
Table 41. Numbered printer messages (continued) 57.1 FAN FAILURE Event log message: 57.00.01 Description: One of the cooling fans failed or is obstructed. Action: 1 = Fan 1 (FM 1) 380 Chapter 7 - Troubleshooting Caution: Turn the printer off and do not operate the printer in this condition or it can be seriously damaged. 1 Turn the printer off and on to reset it. 2 Reconnect connectors J702 and J706 on the carousel motor PCA, and connector J220 on the controller board.
Table 41. Numbered printer messages (continued) 57.2 FAN FAILURE Event log message: 57.00.02 Description: One of the cooling fans failed or is obstructed. Action: 2 = Fan 2 (FM 2) EN Caution: Turn the printer off and do not operate the printer in this condition or it can be seriously damaged. 1 Turn the printer off and on to reset it. 2 Reconnect connectors J703 and J706 on the carousel motor PCA and connector J220 on the controller board.
Table 41. Numbered printer messages (continued) 57.3 FAN FAILURE Event log message: 57.00.03 Description: One of the cooling fans failed. Action: 3 = Fan 3 (FM 3) Caution: Turn the printer off and do not operate the printer in this condition or it can be seriously damaged. 1 Turn the printer off and on to reset it. 2 Reconnect connectors J645 and J647 on the main relay PCA, J18 and J74 relay connectors, and connector J227 on the controller board.
Table 41. Numbered printer messages (continued) 59. MOTOR ERROR CYCLE POWER Event log message: 59.00.0 Description: Indicates that the main motor (M4) is not working properly. Action: = Description: 0 = General error 1 = Startup error 2 = Rotation error 1 Turn the printer off and on to reset the printer. 2 Reconnect connector J219 and relay connector J1 on the controller board. 3 Replace the main motor (M4).
Table 41. Numbered printer messages (continued) 64 PRINTER ERROR CYCLE POWER Event log message: 64.00.00 Description: Indicates a scan buffer error. Action: Turn the printer off and on to reset the printer. 65 PRINTER ERROR CYCLE POWER Event log message: 65.00.00 Description: Indicates a DRAM controller error. Action: 66.0. C-LINK COMM ERROR CHECK CABLES AND CYCLE POWER 1 Turn the printer off and on to reset the printer.
Table 41. Numbered printer messages (continued) 66.11.02 INPUT DEVICE FAILURE CHECK CABLES AND CYCLE POWER Event log message: 66.11.02 Description: Indicates a 2,000-sheet input unit feed motor error. Action: 1 Verify that the c-link and power cables are connected. 2 Turn the printer off and on to reset the printer. 3 Verify that there are no objects in the left side of the tray. 4 Verify that the paper tray raised sensor (PS34) is working properly (perform a sensor test).
Table 41. Numbered printer messages (continued) 66.22.08 OUTPUT DEVICE FAILURE CHECK CABLES AND CYCLE POWER Event log message: 66.22.08 Description: Indicates a multi-bin mailbox flipper motor error. Action: 1 Verify that the c-link and power cables are connected. 2 Turn the printer off and on to reset the printer. 3 Check for jams in the flipper assembly area. 4 Replace the flipper assembly. 5 Replace the multi-bin mailbox controller board PCA. 66.22.
Table 41. Numbered printer messages (continued) 68 NVRAM ERROR SETTINGS CHANGED Event log message: 68.00.00 Description: Indicates that a recoverable error has been detected in the NVRAM. Values for some NVRAM settings were found to be illegitimate in form and were set back to their default value. Action: 1 Verify the printer control panel settings. One or more fields have been reset to their factory defaults during the error recovery. 2 Perform a factory defaults reset (see page 92).
Table 42. Unnumbered printer messages ACCESS DENIED Event log message: None Description: A user has attempted to select a menu value while printer control panel locking is enabled. Action: See the system administrator for access to the printer control panel. If it is necessary to override the password, perform a cold reset. See page 431 for information about performing a cold reset.
Table 42. Unnumbered printer messages (continued) CLEAN DENSITY SENSOR CYCLE POWER Event log message: 54.00.0 Description: The process marks in the density sensing pattern are corrupted (see chapter 5 for more information). Action: = Description: 5 = Sensor abnormality 6 = Out of range cyan 7 = Out of range magenta 8 = Out of range yellow 9 = Out of range black 1 Press GO. 2 Print a configuration page and troubleshoot as an image-quality problem.
Table 42. Unnumbered printer messages (continued) CLEAR FUSER JAM LOWER LEFT DOOR Event log message: 13.00.0 Description: The printer senses a media jam in the fuser area. The printer expected a page to come through the fuser, but the paper has not toggled PS1903, or PS1903 has been toggled an extended amount of time. Action: = Description: 3 = Fusing delivery paper delay jam 4 = Fusing delivery stationary jam WARNING! Do not touch the fuser; it could be very hot and could cause burns.
Table 42. Unnumbered printer messages (continued) CLEAR INPUT DEVICE JAM (continued) Event log message: 13.11.2 Description: 1 = Page stays too long at paper entry sensor (PS31) B = Page stays too long at paper exit sensor (PS32) Action: 1 Open the VTU and remove any media. 2 Verify that the paper entry sensor (PS31) moves freely. 3 Verify that the feed, separation, and pickup rollers are properly seated. 4 If the problem persists, open the VTU and override the VTU closed sensor (PS35).
Table 42. Unnumbered printer messages (continued) CLEAR INPUT JAM Event log message: None Description: The printer senses a media jam in the transfer or registration area, in an input tray, or in the duplexer. Action: 1 Open the front door, press the white button on the lower (green) lever, and swing the lever to the right. Open the right upper door, remove the transfer drum, and remove the jammed media from under the metal paper guide. Reinstall the transfer drum, and close the right upper door.
Table 42. Unnumbered printer messages (continued) (CLEAR MAILBOX JAM, continued) Event log message: 13.22.04 Action: 1 Check for a jam in the delivery head assembly. 2 Ensure free movement in (PSExit1) sensor flags on the delivery head assembly. 3 Verify that the delivery roller fingers are over the ejector rollers on the delivery head assembly. 4 Replace the flat ribbon cable that connects to the delivery head assembly to the controller board PCA.
Table 42. Unnumbered printer messages (continued) CLEAR PAPER JAM Event log message: 13.00.00 Description: The printer senses a media jam. Because this is a generic media jam message, the media might be at any point in the paper path. Action: 1 Open and shut the front door of the printer to clear any media from the printer. Be sure to check the fuser area because media can get wrapped around the fuser and be difficult to find.
Table 42. Unnumbered printer messages (continued) CLEARING PAPER FROM PRINTER Event log message: None Description: The printer is attempting to remove unusable media (such as a misfed page or media damaged in a media jam). Action: No action is required. CLOSE DOOR Event log message: None Description: The printer senses that one of the doors is not closed properly. Action: = A printer door 1 Close the door indicated in the message.
Table 42. Unnumbered printer messages (continued) DISK DEVICE FAILURE Event log message: 30.00.01 Description: The printer hard disk’s internal self-test routine has been invoked to read minimum and maximum logical block addresses (with no retries) and has detected a failure. If access to the printer hard disk is not required, printer operation can continue. Action: Replace the printer hard disk.
Table 42. Unnumbered printer messages (continued) DRUM LIFE LOW ORDER DRUM KIT or DRUM LIFE LOW <20% REMAINING Event log message: None Description: The imaging drum is almost past its specified life. Printing can continue; however, print quality might be degraded. Action: Printing can continue until DRUM LIFE OUT message appears. DRUM LIFE OUT REPLACE DRUM KIT Event log message: None Description: The imaging drum is past its specified life or the waste toner cartridge in the imaging drum is full.
Table 42. Unnumbered printer messages (continued) EIO NOT FUNCTIONAL Event log message: 8. Description: Indicates an EIO card error, but printing can continue. The configuration page will indicate that EIO is not supported. Action: = Failure code 1 Turn the printer off and on to reset the printer. 2 Replace the offending EIO accessory.
Table 42. Unnumbered printer messages (continued) INCORRECT FUSER LOWER LEFT DOOR Event log message: 50.00.05 Description: The printer has detected that an incompatible fuser (possibly the wrong voltage of fuser for the printer) has been installed. Action: 1 Remove the fuser and install the fuser specified for use with this printer. Printing cannot continue until the correct fuser is installed in the printer. For information about ordering a fuser kit, see page 511.
Table 42. Unnumbered printer messages (continued) (INSTALL , continued) 6 Make sure that the black toner cartridge is installed. • Install the black toner cartridge if it is not installed. • If the black toner cartridge is already installed, turn the printer off, reinstall the black toner cartridge, and turn the printer on again. 7 Reconnect connectors J641 and J644 on the main relay PCA, and connector J102 on the power supply.
Table 42. Unnumbered printer messages (continued) INSTALL IMAGING DRUM OPEN FRONT DOOR Event log message: None Description: The printer has detected that the imaging drum is not installed. Action: 1 Note: All doors must be closed for the printer to detect the imaging drum. EN Install the imaging drum before attempting to print. If the condition persists, take the imaging drum out and reinstall it.
Table 42. Unnumbered printer messages (continued) (INSTALL IMAGING DRUM OPEN FRONT DOOR, continued) 11 Check the drum cartridge on/off switch lever on the printer. Set the lever at the correct position if it is disconnected. Replace the lever if it is cracked. 12 Reconnect connector J209, and relay connectors J47 and J48 on the controller board. 13 Replace the controller board.
Table 42. Unnumbered printer messages (continued) LEFT OUTPUT BIN FULL Event log message: None Description: The left (face-up) output bin on the printer is full. Action: Remove all media from the left (face-up) output bin of the printer to continue printing. Note: This message appears only if the optional multi-bin mailbox is installed. LOCK TONER LEVER Event log message: None Description: The blue lever inside the clear door is not locked.
Table 42. Unnumbered printer messages (continued) MANUALLY FEED Event log message: None Description: The printer is requesting that a sheet of media or an envelope be manually fed. Action: Load the requested media type and size into tray 1. If the proper media is already loaded into tray 1, press GO to initiate printing.
Table 42. Unnumbered printer messages (continued) OUT OF MEMORY JOB CLEARED Event log message: None Description: The printer personality for the current job could not be run in the available memory. The job was canceled, and no pages were printed. Action: PCL MEMORY FULL STORED DATA LOST 1 Reprint the job. If the message still appears, turn the printer off and on to reset the printer before sending the print job again. 2 Install more printer memory.
Table 42. Unnumbered printer messages (continued) PRESS SELECT IF FUSER IS NEW Event log message: None Description: The printer has detected that a new fuser might have been installed. Action: Note: This message will also occur if the printer is turned off and on and the internal fuser count indicates the fuser is near the end of its life, or the fuser door is opened. The message displays for 10 seconds. 1 If the fuser has been replaced, press SELECT to reset the internal counter.
Table 42. Unnumbered printer messages (continued) PRESS SELECT TO LOSE DISK DATA PRESS GO KEY TO CANCEL Event log message: None Action: Description: This is a request to confirm initialization of the 1 If you want to proceed with initialization, press printer hard disk (see PRESS SELECT TO SELECT. INITIALIZE DISK above).
Table 42. Unnumbered printer messages (continued) PRINTING FILE DIRECTORY Event log message: None Description: The printer is printing the disk directory. When the file directory is printed, the printer returns to an online and ready state. Action: No action is required. PRINTING FONT LIST Event log message: None Description: The printer is printing the font list. When the font list is printed, the printer returns to an online and ready state. Action: No action is required.
Table 42. Unnumbered printer messages (continued) PS MEMORY FULL STORED DATA LOST Event log message: None Action: Description: The resource save area for the printer personality is Turn the printer off and on to clear the printer RAM. full. Fonts downloaded to the printer RAM might have been deleted. READY Event log message: None Action: Description: The printer is online and ready for data. No status or No action is required. printer attention messages are pending.
Table 42. Unnumbered printer messages (continued) TONER LOW REPLACE Event log message: None Description: The printer is almost out of the specified toner. The printer remains online and ready to print; however, the print quality might be degraded. Action: Although printing can continue, the toner cartridge should be replaced for optimum printer operation. = Cyan, magenta, yellow, or black Note: Do not shake the toner cartridge in attempts to extend the cartridge life.
Table 42. Unnumbered printer messages (continued) TOP OUTPUT BIN FULL Event log message: None Description: The top (face-down) output bin of the printer is full. Action: 1 Remove all media from the top (face-down) output bin on the printer to continue printing. 2 Verify that PS30, PS10, PS11, and PS3 sensors and the surrounding area are clean.
Table 42. Unnumbered printer messages (continued) TRAY 1 LOAD Event log message: None Description: A user has requested a media size that is not currently installed in tray 1. Action: Load the media type and size specified on the printer control panel display. After tray 1 is loaded, the printer automatically brings itself online.
Table 42. Unnumbered printer messages (continued) TRAY EMPTY Event log message: None Description: An input tray not currently selected has run out of media. Action: 1 Load the media type and size specified on the printer control panel display.
Table 42. Unnumbered printer messages (continued) TRAY NOT FUNCTIONAL Event log message: None Description: The installed tray is not supported by the printer. Action: Press GO to continue printing. = Input tray number (2, 3, or 4) TRAY OPEN Event log message: None Description: An input tray is open. Action: Close the input tray before resuming printing.
Aids to troubleshooting This section describes various tools service personnel can use to diagnose hardware problems. In addition to the tools described in this section, the service and support CD-ROM included with your service manual contains the user documentation. Use the additional information to supplement the information found in this manual. Configuration page Print a configuration page to verify that the printer is set up correctly or to verify information about the printer’s configuration.
Interpreting a configuration page The numbers below correspond to the numbered areas on the examples on the following page: 1 Printer information—lists the following information: • printer product number • serial number • PCL firmware date code • PostScript version • total pages printed during the life of the printer • number of color pages printed during the life of the printer • number of black-and-white pages printed during the life of the printer • number of duplex pages printed during the life of the
1 3 6 4 2 5 7 8 Figure 212. Example of an HP Color LaserJet 8500 printer configuration page 1 3 6 4 2 5 9 7 8 10 Figure 213.
Continuous configuration page Continuous configuration pages can be printed to simulate full color printing in which two pages are developed on the transfer drum per rotation (two-page mode). Printing a continuous configuration page Note 1 Press MENU until INFORMATION MENU appears on the printer control panel display. 2 Press ITEM until PRINT CONTINUOUS CONFIG PAGES appears on the display. 3 Press SELECT to print the page. Press CANCEL JOB to stop printing.
Event log Detailed service information is noted in the event log. The following is a list of the types of messages logged in the event log: media jam errors disk failures EIO errors catastrophic errors The last 50 errors are listed, with the most recent error first. Reoccurring events give indications of failing parts or problem areas within the printer. See the printer control panel message descriptions beginning on page 368 for more information on items found in the event log.
Service mode engine diagnostics Engine diagnostics can be used to perform mechanical tests on the print engine and its related components to help pinpoint components in the printer that need replacement or repair. WARNING! Take care when you use engine diagnostics — some tests require door interlocks to be defeated, and defeating interlocks can expose potential hazards in the engine. High-voltage supplies and the laser are shut down whenever the printer is in diagnostic mode.
The pick-up rollers, feed rollers, registration roller, transfer belt press clutch (CL4), cleaning roller press cam and solenoid (SL1), fuser, transfer belt, and output feed roller can be exercised during the paper path test. For safety reasons, the fuser, high-voltage supplies, and scanner are all turned off during testing. Note 1 From the Service Mode Menu, press MENU until PAPER PATH appears. 2 Press ITEM until REPETITIONS appears. 3 Press – VALUE + to display the number of repetitions (1 to 10).
Developer motor test Visually and audibly inspect the cartridge motor (M3) and carousel motor (M1) as they rotate during this test. To view the printer components, run the test with the right upper door open and the transfer drum removed and the front cover and right upper door interlocks defeated (see figure 218 on page 427 and figure 214 on page 425). The engine runs this test for a fixed duration and then stops. Multiple repetitions of the test are allowed.
Drum motor test This test activates the drum motor (M2), imaging drum, transfer drum, and imaging drum waste paddle simultaneously. To view the printer components, run the test with the right upper door open, the transfer drum and imaging drum removed, and the right upper door interlock defeated (see figure 214 on page 425). The engine runs this test for a fixed duration and then stops. Note For safety reasons, the fuser, high-voltage supplies, and scanner are all turned off during testing.
Table 43. Sensor monitor test Designator Sensor name 0 Registration roller paper sensor (PS1) 1 Pick-up unit paper sensor (PS17) 2 Separation sensor (PS5) 3 Fusing delivery sensor (PS1903) 4 Top (face-down) output bin delivery sensor (PS11) 5 Tray 1 paper sensor (PS1301) 6 Tray 2 sensor (PS1202) Toggles once. Trays do not lift during test. 7 Tray 3 sensor (PS1201) Toggles once. Trays do not lift during test.
Disabling interlocks Figure 214. Right upper cover detection interlock Figure 215.
Figure 216. Black toner cartridge detection interlock Figure 217.
Front cover Left lower door detection interlock Delivery cover Front cover detection interlock Left lower door detection interlock Front cover detection interlock Figure 218.
Laser shutters Laser shutter interlocks Figure 219.
Figure 220. Left upper cover detection Figure 221.
Service mode formatter diagnostics 1 From the Service Mode Menu, press MENU until FORMATTER DIAGNOSTICS appears. 2 Press SELECT. WARNING MEMORY LOSS appears on the printer control panel briefly. Then EXECUTE TESTS appears.
Cold reset The following are effects of performing a cold reset: While a cold reset is being performed, all control panel keys are ignored. A cold reset changes all user-accessible printer variables stored in NVRAM to their factory defaults except for the following items: • page counts • fuser life count • transfer life count • multi-bin mailbox mode • display language Color adjust values revert to the factory defaults.
Fault log The fault log is implemented within the formatter diagnostics to record error messages. This log provides service personnel with an account of all errors that occurred while the formatter diagnostics tests were executing. This log is completely separate from the event log. No entries are made in the event log for any diagnostic mode failure.
Paper path troubleshooting General paper path checklist Verify the green lever on the fuser is down. Clean the printer. Toner and paper dust in the paper path inhibit free movement of media through the printer and block the sensors. Vary the input and output selections of the printer to determine if the problem is associated with a particular area of the printer. Worn separation rollers on the input tray cause last-page multifeeds.
Sealed envelopes To prevent envelopes from sealing in the printer, set the envelope size in the printer driver as a custom size. However, setting envelopes as a custom size can cause poor fusing. Media jams When troubleshooting media jams, remember that jams are posted as a result of timing errors. That is, media fails to arrive at, or fails to clear, the paper path sensor in the allotted time. The paper path timing is set by the controller board.
Figure 222. Printer paper path For information about printer and paper handling accessory sensors, see chapter 5.
Following are possible media jams: Table 44. Media jam detection Location of jam Detected when . . . Pick-up delay jam 1 The page has not reached the pick-up unit paper sensor (PS17) within about: 1.2 seconds after leaving tray 2 Pick-up delay jam 2 The media does not reach the registration roller paper sensor (PS1) within about: 1.9 seconds after leaving tray 2 Transfer jam about 0.3 seconds (high-gloss mode) 12.8 seconds (overhead transparency mode) 9.
Table 44. Media jam detection (continued) Location of jam Detected when . . . Top (face-down) output bin delivery delay media jam The media has not reached the top (face-down) output bin delivery sensor (PS11) within the specified time after the fusing delivery sensor (PS1903) detects the media: about 4.0 seconds (normal mode) Top (face-down) tray delivery stationary jam about 16.0 seconds (overhead transparency mode) about 12.
Image formation troubleshooting Before beginning image formation troubleshooting: 1 Verify the media type is set correctly in the printer control panel, and that the media type selected in the printer driver matches the media being printed on. 2 Verify that the media meets the specifications listed in the HP LaserJet Printer Family Paper Specification Guide.
Understanding color variations The printed output might not match the computer screen, and the colors printed on successive pages might not match. While color variations are inherent in this printing method, they also might indicate changes in the printing environment, print media, or printer components. Common causes of color variation The following list outlines the major causes of color variations between computers, applications, and output devices.
printer has a humidity sensor that adjusts operating parameters as the humidity changes to minimize the effects of environmental changes. All consumable components have a finite life span, and as these components reach the end of their useful life, their ability to produce consistent print quality diminishes. When printing on transparencies, OHT must be selected in the printer driver in order for the colors to be treated properly on the transparencies.
Image defects troubleshooting Image orientation Unless otherwise specified, all references in this section to horizontal or vertical directions of print-quality problems refer to problems found on letter- and A4-sized media. These media sizes are fed into the printer long edge first. Because media sizes other than letter or A4 are fed into the printer short edge first, the orientations of print quality problems differ from those on letter- or A4-sized media.
1 2 3 4 5 6 Figure 223. Note Image orientation and direction of travel 1 Letter- or A4-sized media 2 11-by-17 inch or A3-sized media (or any other size of media) 3 Print quality problem (developer streak, in this example) 4 Direction media moves through the printer (process direction) 5 Direction streaks occurs on pages 6 Direction banding occurs on pages PostScript print samples are located on the service and support CD (which is included with your service manual).
é Leading edge é Figure 224. Color-plane registration See page 452 for a resolution to this print defect.
é Developer streak é Leading edge é Figure 225. Developer streak See page 453 for a resolution to this print defect.
é Leading edge é Figure 226. Rain See page 453 for a resolution to this print defect.
é Leading edge é Figure 227. Toner bubbles See page 453 for a resolution to this print defect.
é Leading edge é é 44 mm intervals Figure 228. é 44 mm intervals é Charge roller set See page 454 for a resolution to this print defect.
é Leading edge é Figure 229. Waves See page 454 for a resolution to this print defect.
é Leading edge é Figure 230. Missing toner See page 454 for a resolution to this print defect.
é Leading edge é Figure 231. Hot offset (glossy paper or transparency) See page 455 for a resolution to this print defect.
é Leading edge é Figure 232. Fading resulting from broken transfer guide See page 455 for a resolution to this print defect.
Color-plane registration (See figure 224 on page 443 for an example of this print defect.) Poor color-plane registration is characterized by “bleeding” colors, by apparent gaps in color, and by colors offset from each other or from black. The examples on page 443 show all three types: In the upper left, yellow is offset from colors that use yellow. At the bottom, the double line is caused by black offset from colors. In the upper right, colors are offset from black, causing a noticeable gap.
Developer streak (See figure 225 on page 444 for an example of this print defect.) Developer streak is characterized by a line of dark or missing toner that stretches from the leading edge to the trailing edge. Replace the toner cartridge corresponding to the color of the developer streak (for example, if the streak is magenta, replace the magenta toner cartridge). Rain (See figure 226 on page 445 for an example of this print defect.) Rain is characterized by small, white, elongated spots in printed areas.
Charge roller set (See figure 228 on page 447 for an example of this print defect.) Charge roller set print defect, usually only noticeable in lighter halftone colors, is characterized by banding lines at intervals of 44 mm (approximately 1.75 inches). The print defect usually appears immediately after installing a new imaging drum or if the printer has been in storage without power applied for a prolonged period of time.
Hot offset (See figure 231 on page 450 for an example of this print defect.) The “hot offset” print defect is characterized by blotches of toner on printed transparencies. Avoid the print defect by using only thicker transparencies specifically designed for HP Color LaserJet printers. Fading (See figure 232 on page 451 for an example of this print defect.) A broken transfer drum guide (see figure 260 on page 540, reference #40) causes a distinct fading pattern.
Toner cartridge manufacturing codes Heat-stamped on the toner cartridge, opposite the label-end of the cartridge, is a manufacturing code. If a portion of the code does not match the list below, replace the toner cartridge.
Color balance adjustment CAUTION Adjusting the color balance changes the printer’s calibration. Because this procedure adjusts parameters within the printer hardware, it will affect all print jobs. The printer automatically recalibrates the color settings. However, you can adjust the color manually from the default settings by changing the densities of the four toners (black, cyan, magenta, and yellow).
B A C D Figure 233.
1 Print the color adjust page. a Press GO and – VALUE + at the same time. COLOR ADJUST MENU appears on the printer control panel display. b Press ITEM until PRINT TEST PAGE appears on the display. c Press SELECT to print the color adjust page. d Press GO to exit the Color Adjust Menu. The color adjust page allows you to adjust the printer’s two halftone screens for each of the four colors (black, cyan, magenta, and yellow), for a total of eight adjustments.
4 Enter the color adjustment numbers in the printer control panel. a Press GO and – VALUE + at the same time. COLOR ADJUST MENU appears on the display. b Press ITEM until the option you want appears on the display.
Table 45.
Repetitive defects troubleshooting Repetitive defects are defects that occur in the same vertical position on the page, but not necessarily on every page. Most repetitive defects are caused by problems with one of the following, and are indicated by the positioning of the defect on the page: developer roller (at 38 mm) charging roller (at 44 mm)—see additional information under “Charge roller set” on page 454. cleaning roller (at 56 mm) fuser (at 150.
Repetitive defects troubleshooting First occurrence of print defect Color developer roller, 38 mm Charging roller, 44 mm Black developer roller, 52 mm Cleaning roller, 56 mm Developer DSD wheels 65 mm Transfer roller, 66 mm Transfer drum, once per 11-by-17 inch or A3-sized page or every other letteror A4-sized page Fuser, 150.5 mm Imaging drum, 195 mm Transfer belt, 222 mm Figure 234.
Color developer roller Symptoms: Print defect occurring every 38 mm. Cause: Dirty or damaged developer roller. Actions: Replace the toner cartridge. Charging roller Symptoms: Print defect occurring every 44 mm. Cause: Dirty or damaged charging roller. Actions: Replace the imaging drum. Black developer roller Symptoms: Print defect occurring every 38 mm. Cause: Dirty or damaged developer roller. Actions: Replace the toner cartridge. Cleaning roller Symptoms: Print defects occurring every 56 mm.
Transfer roller Symptoms: Print defect occurring every 66 mm. Cause: Dirty or damaged transfer roller. Actions: Clean the transfer roller with isopropyl alcohol and a hand wipe. If cleaning does not resolve the defect, replace the transfer belt. Transfer drum Symptoms: Print defect occurring once per page on 11-by-17-inchor A3-sized media, or on every other letter- or A4- sized page. Cause: Dirty or damaged transfer drum. Actions: Clean the transfer drum (see below).
1 Turn the printer off and open the front door. 2 Press the button and swing the lower lever to the right. 3 Open the right upper door, and remove the transfer drum. 4 Using the print sample as a reference, inspect the transfer drum for a spot or speck that might be causing the repetitive defects. Figure 235. Cleaning the transfer drum CAUTION Do not clean the transfer drum using force. Do not use any water-based cleaners or alcohol. These actions can permanently damage the transfer drum.
Fuser Symptoms: Print defects occurring at about 150.5 mm. The defects will be most visible on overhead transparencies. Cause: Defect on the upper fuser roller. Actions: 1 Power the printer off, allow 30 minutes for the fuser to cool, and remove the fuser. 2 Turn the fuser gears and inspect the surface of the upper fusing roller. If the roller has surface defects, replace the fuser assembly. Imaging drum Symptoms: Print defects occurring every 195 mm.
Transfer belt Symptoms: Print defects occurring every 222 mm. Cause: Defects on the transfer belt surface. Actions: Remove the transfer belt and inspect the entire belt surface. Use the transfer belt gears to rotate the belt through its travel.
2,000-sheet input unit troubleshooting This section provides a systematic approach to identifying the causes of malfunctions and errors in the 2,000-sheet input unit. Ways to troubleshoot the unit In general, there are three possible sources of malfunction: the 2,000-sheet input unit itself printer electronics the C-link cable that connects the unit and the printer Begin troubleshooting 1 Print or display the error log.
Status LED descriptions The status light on the front of the unit provides status information. Table 46. Status LED on the 2,000-sheet input unit State Description Resolution Solid green The unit is on and ready. None required. Solid amber The unit is experiencing a hardware malfunction. Flashing amber The unit has a media jam or a Clear the jam or remove the page needs to be removed page. from the 2,000-sheet input unit, even if the page is not jammed. The VTU might be open.
Service LED descriptions 1 2 3 Figure 236. Note Rear view of 2,000-sheet input unit 1 Service LEDs 2 DIP switches 3 Power supply Be sure to turn the power supply off and set all DIP switches to the off position when you finish the test, or the unit will not work. The DIP switch is ON if it is to the right. The DIP switch is OFF if it is to the left.
Service LED interpretation If the 2,000-sheet input unit is working properly, it will pick up paper from tray 4 and expel it; the bottom service LED will flash regularly every 0.5 seconds. Table 47. Patterns of LED flashing (2-second pause between each pattern) Long (1 sec) Description Recommended action 3 1 Lifter malfunction Verify that the tray lifts freely by lifting it by hand. Verify that the paper size plates are installed correctly (in the same corresponding slots) and are not bent.
DIP switch settings The following table shows the position of the DIP switches to run each of the 2,000-sheet input unit diagnostic tests. Table 48. DIP switch settings for troubleshooting test procedures DIP switch Normal setting Motor test Standalone running test Sensor test 1 Off On On Off 2 Off On Off Off 3 Off Off Off On 4 Off On On On Standalone running test This test verifies that the 2,000-sheet input unit is functioning properly. For this test, use the service LEDs.
Motor test This test verifies that the three motors on the 2,000-sheet input unit are functioning properly. 1 Remove the back cover from the 2,000-sheet input unit (see page 300). 2 Open tray 4 and the vertical transfer unit (VTU). 3 Set the DIP switches on the 2,000-sheet input unit’s controller PCA for the motor test. (See page 473 for an explanation of the settings.) 4 Use the switch that is located on the unit’s power supply to switch to diagnostic mode.
Sensor test This test verifies that the sensors on the 2,000-sheet input unit are functioning properly. 1 4 2 5 3 Figure 237. Location of sensors in the 2,000-sheet input unit 1 Paper exit sensor (PS32) 2 Paper entry sensor (PS31) 3 VTU closed sensor (PS35) 4 Paper tray raised sensor (PS34) 5 Paper tray empty sensor (PS33) To perform the test 1 EN Set the DIP switches on the 2,000-sheet input unit’s controller PCA for the sensor test. (See page 473 for an explanation of the settings.
2 For each paper sensor: a Open the paper tray and the VTU on the 2,000-sheet input unit. b Remove the metal spring that holds the sensor unit in place (secured by 1 screw) (see figure 161, callout 2, and figure 163, callout 2). c Pull out the sensor unit. 3 Use the switch that is located on the unit’s power supply to switch to diagnostic mode. 4 Manually activate the sensor. • When you activate the sensor, the bottom service LED on the controller PCA comes on.
Multi-bin mailbox troubleshooting The multi-bin mailbox standalone diagnostic tool is a troubleshooting aid that verifies how the multi-bin mailbox functions alone. The tests are designed to be used without C-link commands from the EPH controller on the printer. Switching the multi-bin mailbox to test mode Note 1 Turn the printer off and remove the multi-bin mailbox from the printer. 2 Move the multi-bin mailbox power supply switch to test mode (callout 1).
Power-up sequence test 1 Push in and hold the multi-bin mailbox interlock switch. The multibin mailbox begins a power-up test. • All the motors in the multi-bin mailbox start working, and the delivery head assembly moves up and down the multi-bin mailbox twice, scanning to determine that all the output paper bins are properly installed. • At the end of the power-up test, the flipper motor remains working and waiting for feeding paper.
Multi-bin mailbox LED descriptions The multi-bin mailbox features a user status LED and three service LEDs. The user status LED is a single LED that is located on the front cover of the multi-bin mailbox at the top. The user LED provides information about the power-on status and about the attachment to and alignment of the accessory with the printer. The three service LEDs are near the center of the multi-bin mailbox back cover.
Table 49. Status LEDs on the multi-bin mailbox (continued) User LED Service LEDs Message description Multi-bin mailbox unlatched from the printer The multi-bin mailbox is not properly attached to the printer. Flipper error During the flipper calibration, an abnormal reference voltage was encountered. Face-up bin is too full The face-up bin is too full. Jam in flipper area Time-out condition at the entry area.
Table 49. Status LEDs on the multi-bin mailbox (continued) User LED Service LEDs Message description Recommended action External memory error Multi-bin mailbox NVRAM damaged. Jam in delivery head assembly Time-out condition in the PSExit1 sensor. Jam in the delivery head position system The elevator motor detects an invalid window when scanning. Wrong page request Page request received with invalid output bin or invalid paper size information.
3,000-sheet stapler/stacker troubleshooting Calibrating the staple position Note Recalibrate the staple position only if the accumulator assembly, the carriage assembly, or the controller PCA is replaced. NVRAM located in the controller PCA keeps in memory the configured compensation values for the staple position. When the device is in service mode, you can gain access to the flexible calibration menu. To calibrate the staple position 1 Turn the printer off.
15 Press – VALUE + to set the correct compensation (in millimeters). 16 Press SELECT. 17 Repeat steps 9 through 16 until you are comfortable with the staple position. 18 Press MENU until Configuration of Stkr appears. 19 Press ITEM until Calibra Values appears. 20 Press – VALUE + until Set appears. 21 Press SELECT. 22 Press GO. If you set compensation values, the printer should return to Ready automatically and the user LED should return to the solid green status.
Troubleshooting tools Paper path test Using the information from the event log, you can verify a specific printer paper path with the paper path test. The paper path test menu allows you to select the paper source and the output destination. Note See Chapter 5, Theory of Operation, for graphic representations of the paper path. To perform a paper path test 1 Press MENU until Information Menu appears on the control panel display. 2 Press ITEM until Print Paper Path Test appears and then press SELECT.
Timing The figure below shows timeouts related to jam declarations. The number in parentheses is the jam’s error log code. Note Jam codes used in the drawing and in the explanation are in hexadecimal representation. The time is the maximum time allowed between two events. The figure shows the flow of a normal sheet, from entry to the accumulator/offset module. Figure 240. Device timing The printer sends a delivery notice for each sheet.
FLEntry 1 sensor and FLEntry sensor If the sheet does not arrive to the FLEntry 1 sensor within three seconds, the device declares a jam 02. When the sheet arrives at the FLEntry 1 sensor, which means that the sheet is being pushed by the printer and pulled by the device, the timer is reset to timeout in one second. If the sheet does not arrive at FLEntry sensor in one second, the device declares a jam 03. Next, the FLEntry 1 sensor is deactivated.
Standalone diagnostic tool The standalone diagnostic routines differ between the 3,000-sheet stapler/stacker and the 3,000-sheet stacker. The standalone diagnostic tool tests the device's motors and functionality without the C-link commands from the printer. The device has a user LED and a set of service LEDs. Note User LED—the single LED located at the top of the front cover provides information about the power-on status and attachment/ alignment to the printer.
Note The user LED blinks green when the printer is turned on after setting and exiting service mode. Perform steps 18 through 22 under “Calibrating the staple position” earlier in this chapter to return to normal operation. Stapler test/stacker test For the stapler test/stacker test, use letter- or A4-sized paper. Feed the paper straight, centered, and slowly to avoid skews and jams. If a jam occurs, release the interlock switch and depress it again to reset the device.
Stacker bin test Block the upper optical sensor and observe the movement of the stacker bin. Face-up bin full sensor test Lift and hold up the bin-full flag until the user LED blinks amber. The user LED should blink amber within a few seconds. Stacker Bin Full Sensor Test Block the upper optical sensor until the stacker bin reaches the bottom of its motion, triggering the stacker bin full sensor; the user LED should blink amber.
Service LED flashing patterns The blinking of the service LEDs will be 0.5 second on and 0.5 second off during the coding sequence. After a two-second delay the sequence will be repeated. Table 50.
Printer messages Control panel messages and errors Be sure to read the exact text of the control panel message, including the error message number and the text, in order to locate the error message in the tables. The printer has enhanced information in the control panel. Printer messages shown on the control panel display provide five categories of information. Each message category is assigned a priority. If more than one condition occurs at the same time, the highest priority message is shown.
For both the control panel and event log messages: x is the C-link device number in the daisy chain: 0 Paper handling controller 1 First C-link device 2 Second C-link device 3 Third C-link device 4 Fourth C-link device 5 Fifth C-link device y is the C-link device type: 0 Paper handling controller 1 Input device 2 Output device 3 Finishing device 4 Other supported device (not in use) 5 Other supported device (not in use) zz is the error code.
Shown below are examples of control panel messages with their corresponding event log messages and meanings. Recommended actions are not shown; see the error message tables later in this chapter for recommended actions. Control panel message Event log Meaning 13.11 Paper Jam in Input 13.11.1B Device A jam occurred in the first C-link device configured. It is an input device (2,000-sheet Input Tray or 2 x 500-sheet Input Tray) with an error code 1B. This is normally a timeout at an entry or exit sensor.
HP 3,000-sheet stapler/stacker error messages Operating errors Table 52. Operating errors in the stapler/stacker Event Control panel log error User message LED messages Service LED Description Recommended action Output bin N/A full Clear paper from face up Blinking N/A amber (print job or mopy in progress) Face up bin is full; 125 sheets have been collected in the face-up bin.
Open Doors Table 53. Open doors in the stapler/stacker Event Control panel log error User message LED messages Service LED Description Recommended action Stkr: Attach to printer N/A Blinking amber Blinking green The device is detached from the printer. Stkr: Close stapler door N/A Blinking amber Blinking green The stapler door is Close the stapler open. door. EN Attach the device to the printer and verify that the user LED is green.
Jams Table 54. Jams in the stapler/stacker Control panel messages Stkr: Detach and Clear Jam Event log error User message LED 13.13 01 or 13.23 01 Blinking amber Service LED Blinking yellow (two blinks) Description When powering on or after clearing a jam, a jam is present at the flipper entry area. Recommended action 13.13 02 or 13.23 02 Blinking amber Blinking yellow (two blinks) Media never reached the flipper entry sensors. 13.13 03 or 13.
Table 54. Jams in the stapler/stacker Control panel messages Stkr: Detach and Clear Jam (continued) Event log error User message LED 13.13 04 or 13.23 04 Blinking amber Service LED Blinking yellow (two blinks) Description Media jammed in the flipper area. Recommended action 13.13 05 or 13.23 05 Blinking amber Blinking yellow (two blinks) Media jammed in the flipper area. 13.13 06 or 13.23 06 Blinking amber Blinking yellow (two blinks) Self-adjustment routine incomplete. 13.
Table 54. Jams in the stapler/stacker Control panel messages Stkr: Detach and Clear Jam (continued) Event log error User message LED 13.13 0A or 13.23 0A Blinking amber Service LED Description Blinking yellow (three blinks) Media jammed when flipping and not reaching the exit sensor. Recommended action 13.13 0B or 13.23 0B Blinking amber Blinking yellow (three blinks) Media jammed when entering the accumulator. 13.13 11 or 13.23 11 13.13 12 or 13.
Table 54. Jams in the stapler/stacker Control panel messages Stkr: Detach and Clear Jam (continued) Event log error User message LED 13.13 13 or 13.23 13 Blinking amber Service LED Blinking yellow (four blinks) Description A jam occurred when trying to eject a print job or mopy. Recommended action Stkr: Detach and clear staple jam 13.13 19 or 13.23 19 Blinking amber Blinking yellow (five blinks) Media jammed between the carriage and the stack of paper to be stapled. Clear the jam.
Table 55. Hardware malfunctions in the stapler/stacker Control panel messages Stkr: Call Service Stkr: Error 04 66.13.18 or 66.23.18 Output device failure Stkr: Call Service Stkr: Error 05 66.13.25 or 66.23.25 Output device failure Stkr: Call Service Stkr: Error 06 66.13.33 or 66.23.33 Output device failure Stkr: Call Service Stkr: Error 06 66.13.34 or 66.23.34 Output device failure Event log error User message LED 66.13.18 or 66.23.
Table 55. Hardware malfunctions in the stapler/stacker Control panel messages Stkr: Call Service Stkr: Error 06 66.13.35 or 66.23.35 Output device failure Stkr: Call Service Stkr: Error 06 66.13.36 or 66.23.36 Output device failure Stkr: Call Service Stkr: Error 06 66.13.37 or 66.23.37 Output device failure EN Event log error User message LED Service LED 66.13.35 or 66.23.35 Blinking The controller PCA red is damaged.
Communications troubleshooting HP network interface support Unless you have experience with the particular network under repair, seek the help of a qualified network professional before changing any network configuration settings. If the printer is configured with an HP network interface card (such as an HP JetDirect product), the Response Center is available to help with any problems.
Diagrams This section contains general circuit (wiring) diagrams. Figure 242.
Developer/ imaging drum bias supply High-voltage power supply Figure 243.
Figure 244.
Figure 245.
Figure 246.
508 Chapter 7 - Troubleshooting EN
8 Parts and diagrams Chapter contents Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 511 Ordering parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 511 Consumables, options, and accessories . . . . . . . . . . 511 Miscellaneous parts. . . . . . . . . . . . . . . . . . . . . . . . . . 514 Illustrations and parts lists . . . . . . . . . . . . . . . . . . . . . . . . . . 516 Major assembly locations . . . . . . . . . . . . . . . . . . . . .
2,000-sheet input unit components . . . . . . . . . . . . . . 560 Multi-bin mailbox components . . . . . . . . . . . . . . . . . . 564 3,000-sheet stapler/stacker components. . . . . . . . . . 570 Numerical parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 574 Alphabetical parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview The figures in this chapter illustrate the major assemblies in the printer and their component parts. A table (materials list) follows each exploded assembly diagram. Each table lists a reference number to the illustration, part number, quantity, and description for each part. Note When looking for a part number, pay careful attention to any voltage listed in the description column to ensure that the part number selected is for the correct printer model.
Table 56. Accessories and consumables Part number Description EIO accessories Memory C2986-60006 Hard disk, internal, 3.2 GB C7842A 8-MB synchronous DIMM NOTE: For all DIMM products, you must install DRAM DIMMs in synchronized pairs—for example, two 4-MB DIMMs.
Table 56.
Table 56.
Table 57.
Table 57. Miscellaneous parts (continued) Part number Description XA9-0836-000CN Screw, TP, M3 x 6, quantity=10 XA9-0926-000CN Screw, TP, M4 x 8, quantity=10 XA9-0940-000CN Screw, w/washer, M4 x 12, quantity=4 XA9-0951-000CN Screw, w/washer, M3 x 8, quantity=10 Illustrations and parts lists The following illustrations and their assorted parts tables list the field replaceable units (FRUs) for this printer.
Major assembly locations Black cartridge cam assembly Delivery assembly Black cartridge guide assembly Delivery drive assembly Left cover feeder assembly Paper pick-up assembly Transfer belt assembly Registration roller assembly Tray 1 pick-up assembly Registration frame assembly Figure 247.
Solenoid assembly Drum/cartridge drive assembly Delivery frame assembly Fuser assembly Tray 2 Tray 3 Color toner cartridge Figure 248.
Printer covers and doors Figure 249. Printer covers and doors (1 of 4)—Filler panel for tray 2 (HP Color LaserJet 8550 base model only) Table 58. Printer covers and doors (1 of 4)—Filler panel for tray 2 Ref. Description Part number Qty.
Figure 250.
Table 59. Printer doors and covers (2 of 4) Ref. Description Part number Qty.
Figure 251.
Table 60. Printer doors and covers (3 of 4) Ref. Description Part number Qty. 1 Filter, large air RB1-9807-000CN 1 2 Cover assembly, top RG0-0111-000CN 1 2 Cover assembly, top (HP CLJ 8550 MFP only) 1 Note This cover is the molded plastic ONLY; electronics are not attached. The cover allows for attachment of the copy module frame.
Figure 252.
Table 61. Printer covers and doors (4 of 4) Ref. Description Part number Qty.
Internal cover assembly Figure 253.
Table 62. Internal cover assembly parts Ref. Description Part number Qty.
Internal components Figure 254.
Table 63. Internal components parts (1 of 6) Ref. Description Part number Qty.
40 Figure 255.
Table 64. Internal components parts (2 of 6) Ref. Description Part number Qty.
Figure 256.
Table 65. Internal components parts (3 of 6) Ref. Description Part number Qty.
Figure 257.
Table 66. Internal components parts (4 of 6) Ref. Description Part number Qty.
Figure 258.
Table 67. Internal components parts (5 of 6) Ref. Description Part number Qty.
Figure 259.
Table 68. Internal components parts (6 of 6) Ref. Description Part number Qty.
Drum/cartridge drive assembly 40 Figure 260. Drum/cartridge drive assembly Table 69. Drum/cartridge drive assembly parts Ref. Description Part number Qty.
Delivery drive assembly Figure 261. Delivery drive assembly Table 70. Delivery drive assembly parts Ref. Description Part number Qty.
Tray 3 assembly Figure 262. Tray 3 assembly Table 71. Tray 3 assembly parts Ref. Description Part number Qty.
Tray 2 assembly Figure 263. Tray 2 assembly Table 72. Tray 2 assembly Ref. Description Part number Qty.
Paper pick-up assembly 41 40 Figure 264.
Figure 265.
Figure 266.
Table 73. Paper pick-up assembly parts Ref. Description Part number Qty.
Registration frame assembly Figure 267. Registration frame assembly Table 74. Registration frame assembly parts Ref. Description Part number Qty.
Registration roller assembly Figure 268. Registration roller assembly Table 75. Registration roller assembly parts Ref. Description Part number Qty.
Feeder assembly Figure 269. Feeder assembly Table 76. Feeder assembly parts Ref. Description Part number Qty.
Tray 1 pick-up assembly Figure 270. Tray 1 pick-up assembly Table 77. Tray 1 pick-up assembly parts Ref. Description Part number Qty.
Tray 1 assembly Figure 271. Tray 1 assembly Table 78. Tray 1 assembly parts Ref. Description Part number Qty.
Delivery assembly Figure 272. Delivery assembly Table 79. Delivery assembly parts Ref. Description Part number Qty.
Delivery cover assembly Figure 273. Delivery cover assembly Table 80. Delivery cover assembly parts Ref. Description Part number Qty.
Transfer belt assembly Figure 274. Transfer belt assembly Table 81. Transfer belt assembly parts Ref. Description Part number Qty.
Fuser assembly Figure 275.
Figure 276.
Table 82. Fuser assembly parts Ref. Description Part number Qty.
PCA assemblies 7 Figure 277. PCA assemblies Table 83. PCA assembly parts Ref. Description Part number Qty.
2,000-sheet input unit components Figure 278.
Table 84. 2,000-sheet input unit cover and door parts Ref. Description Part number Qty.
Figure 279.
Table 85. 2,000-sheet input unit internal component parts Ref. Description Part number Qty.
Multi-bin mailbox components Figure 280.
Table 86. Multi-bin mailbox component parts (1 of 3) Ref. Description Part number Qty. 20 User LED PCA (with cable) C4785-60515 1 21 Adjustable fixed caster C4785-60511 2 22 Attachment assembly (rod, bracket, cables) C4785-60516 1 23 Blind cover C4785-60503 1 24 Face-down bin C4785-60502 1 25 Face-up bin C3764-60505 1 26 Cover, front C4785-60504 1 27 Exchange multi-bin mailbox assembly Note: You must have a 2,000-sheet input unit in order to install a multi-bin mailbox.
Figure 281.
Table 87. Multi-bin mailbox component parts (2 of 3) Ref. Description Part number Qty.
Figure 282.
Table 88. Multi-bin mailbox component parts (3 of 3) Ref. Description Part number Qty.
3,000-sheet stapler/stacker components 5 4 3 2 6 7 1 Figure 283.
Table 89. 3,000-sheet stapler/stacker components (1 of 2) Ref. Description Part number Qty.
9 8 20 21 10 22 19 11 18 12 13 15 17 16 14 Figure 284.
Table 90. 3,000-sheet stapler/stacker components (2 of 2) Ref. Description Part number Qty.
Numerical parts list Table 91. Numerical parts list Part number Description Figure Ref.
Table 91. Numerical parts list (continued) Part number Description C2934A HP Color LaserJet transparencies (letter-sized), — 50 sheets — C2936A HP Color LaserJet transparencies (A4-sized), 50 — sheets — C2946A IEEE-1284 compliant parallel cable of 3 m (approximately 10 ft) with 25-pin male/micro 36-pin male “C” size connector — — C2985A EIO hard disk — — C2986-60006 Hard disk, internal, 3.
Table 91.
Table 91. Numerical parts list (continued) Part number Description Figure Ref.
Table 91. Numerical parts list (continued) Part number Description Figure Ref.
Table 91. Numerical parts list (continued) Part number Description Figure Ref.
Table 91. Numerical parts list (continued) Part number Description Figure Ref.
Table 91. Numerical parts list (continued) Part number Description Figure Ref.
Table 91. Numerical parts list (continued) Part number Description Figure Ref.
Table 91. Numerical parts list (continued) Part number Description Figure Ref.
Table 91. Numerical parts list (continued) Part number Description Figure Ref.
Table 91. Numerical parts list (continued) Part number Description Figure Ref.
Table 91. Numerical parts list (continued) Part number Description Figure Ref.
Alphabetical parts list Table 92. Alphabetical parts list Description Part number Figure Ref.
Table 92. Alphabetical parts list (continued) Description Part number Figure Ref.
Table 92. Alphabetical parts list (continued) Description Part number Figure Ref.
Table 92. Alphabetical parts list (continued) Description Figure Ref.
Table 92. Alphabetical parts list (continued) Description Part number Figure Ref.
Table 92. Alphabetical parts list (continued) Description Part number Figure Ref. Ethernet 10Base-T J3110A — — Ethernet combo (10Base-T, BNC, and LocalTalk) J3111A — — Exchange duplexer — — Exchange multi-bin mailbox assembly C4785-69519 NOTE: You must have a 2,000-sheet input unit in order to install a multi-bin mailbox.
Table 92. Alphabetical parts list (continued) Description Part number Figure Ref. Gear, 14T RB1-9955-000CN 258 14 Gear, 14T RB1-9956-000CN 258 15 Hard disk, internal, 3.
Table 92. Alphabetical parts list (continued) Description Part number Figure Ref.
Table 92. Alphabetical parts list (continued) Description Part number Figure Ref.
Table 92. Alphabetical parts list (continued) Description Part number Figure Ref.
Table 92. Alphabetical parts list (continued) Description Part number Figure Ref. Power supply C4785-60501 282 40 Power supply C4788-60511 284 17 Power supply assembly (110 V) RH3-2185-000CN 254 25 Power supply assembly (220 V) RH3-2187-000CN 254 25 Power supply cable RG5-3909-000CN 279 99 Power supply fuse 250 V, 3.
Table 92. Alphabetical parts list (continued) Description Part number Figure Ref.
Table 92. Alphabetical parts list (continued) Description Part number Figure Ref.
600 Chapter 8 - Parts and diagrams EN
Index - Value + key 80 Numerics 1,000-sheet paper deck (input) printer model included with 22 100Base-TX networks 76, 512 10Base2 networks 77 10Base-T networks 76, 512 11-by-17-inch sized media. See media 12-by-18.5-inch sized media.
Adobe PostScript. See PostScript (PS) air filter door 42 air filters.
location 118 replace frequency 119 switch 187 toner level detection 159 blind cover (multi-bin mailbox) 210 BNC accessories 512 connection 76 port 76 T connector 77 boards. See PCAs; PCAs (2,000-sheet input unit); PCAs (multibin mailbox) bond media. See media booklet printing 109 buffer EIO overflow 370 parallel I/O overflow 370 scan error 384 buttons. See keys on control panel C C5-sized media.
toner catch tray 116 toner from fabric 100 transfer drum 150, 465 cleaning roller charging process 150 control process 162 illustration 136 location 118 press cam 150 press solenoid 150, 189 repetitive defects 464 replace frequency 119 cleaning roller HV module assemblies 291 removing 292 cleared job 405 clearing duplexer jams 389 event log 94 fuser jams 390 input tray jams 392 multi-bin mailbox jams 392 paper 395 top output bin jams 393 transfer drum jams 394 unexpected paper size jams 394 C-link cable con
conformity, declarations of 47 connecting cables 74 printer to network 76 consumables installing 98 location 118 low and out messages 88 ordering 62, 511 parts list 512 recycling 119 replace frequency 119 storage specifications 26 user-replaceable 224 contents of box 73 continuous configuration pages, printing 83 continuous test message 395 control panel display language 97 illustration and description 80 LEDs 80 location 41 menu maps 82 messages 368 removing 246 control panel messages 3,000-sheet stapler/s
developer streak 453 fading 455 hot offset 455 input tray switches 433 missing toner 454 rain 453 repetitive 462 repetitive ruler 463 sensors 434 toner bubbles 453 waves 454 deleted fonts 405, 409 delivery assembly 517, 553 delivery cover assembly 554 switch 187 delivery drive assembly location 517 parts list 541 removing 285 delivery frame assembly 518 delivery head (multi-bin mailbox) assembly 210, 331 assembly jams 481 line 210 motor 209, 210 position motor 321 position system jams 481 roller motor 209 d
drums cleaning transfer 465 illustration 136 installing imaging 124 installing transfer 120 location 118 replace frequency 119 dual inline memory modules (DIMMs).
expired fuser and paper rollers 398 imaging drum 397 external paper-handling (EPH) controller board 199, 207 F face-down bins (multi-bin mailbox) 210 face-down output assembly 249 face-down output bin. See top (face-down) output bin face-down tray delivery sensor 178 face-up bin (multi-bin mailbox) 210 face-up exit assembly 260 face-up output bin.
formatter assemblies 43 formatter board 254 diagnostics 94 location 42, 43 parts list 515 serial number 93 video test (VX ASIC) 95 formatter pan 272 frequency for replacing consumables 119 front assemblies 251 front cover 2,000-sheet input unit 299 multi-bin mailbox 314, 315 removing 228 switch 187 front door 41 front LED PCA assembly (2,000-sheet input unit) 308 front right cover 229 FRUs (field replaceable units).
HP Fax Information Retrieval Support Technology (FIRST) Europe 65 U.S. 64 HP FIRST (Fax Information Retrieval Support Technology) Europe 65 U.S. 64 HP JetDirect internal print server.
J jams delivery head assembly 481 delivery head position system 481 detection process 192 duplexer 389 flipper area 480 fuser 390 general media 394 input tray 392 multi-bin mailbox 392 selecting media to prevent 29 stapler/stacker 485 top output bin 393 transfer belt 480 transfer drum 394 tray 4 394 troubleshooting 434 unexpected paper size 394 Japan VCCI statement 54 JetDirect internal print server. See print server JetSend 416 JIS B4-sized media. See media JIS B5-sized media.
life drum kit low 397 drum kit out 397 fuser and paper roller low 398 fuser and paper rollers out 398 transfer kit low 411 transfer kit out 411 life detection fuser kit 156 imaging drum 154 transfer kit 156 lifting plate position sensor 183, 185 solenoid 183, 189 lifting plate (2,000-sheet input unit) 203, 204 lights.
optimized 22 out and job cleared 405 parts list 512 PCL full 405 shortage 404 Menu key 80 menu maps description 82 printing 83 menus Color Adjust 92 Configuration 88 control panel 82 duplex registration 91 I/O 91 Information 83 Paper Handling 85 Printing 89 Proof and Print 84, 85 Quick Copy Jobs 84 Resets 92 Service Mode 93 messages cold reset 395 control panel 368 language used 97 low and out 88 multi-bin mailbox 479 numbered 368 unnumbered 388 metallic tape and housing assembly (multi-bin mailbox) 325 MFP
paper bins 318 paper supply 317 power-on sequence 206 power-up sequence test 478 printer model included with 22 removable parts 314 removing 253 sensors, switches, motors, and controller board 208 top cover 316 top output bin (face-up) full 398 transport belt motor 322 troubleshooting 477 unlatched 480 user status LED PCA 336 multipart forms 37 multipurpose tray.
tray 1 pick-up 183 tray 2 and tray 3 pick-up 181 unexpected size or type 372 See also media paper bin (multi-bin mailbox) empty sensor 209 full sensor 209 paper delivered to bin sensor (multi-bin mailbox) 209 paper delivered to head sensor (multi-bin mailbox) 209 paper entry sensor 2,000-sheet input unit 200 multi-bin mailbox 209 paper exit sensor (2,000-sheet input unit) 200 paper guide.
toner cartridges 513 transfer assembly 555 transfer kits 513 upper cassette assembly 543 PCAs assemblies 559 carousel motor 282 developer/imaging drum bias supply 289 high-voltage power supply 291 main relay 293 power supply circuit 167 separation discharge high-voltage converter 295 subrelay 252 tray 2 and tray 3 media size sensing 296 PCAs (2,000-sheet input unit) controller 307 front LED 308 PCAs (3,000-sheet stapler/stacker and 3,000-sheet stacker) controller 353 LED 354 PCAs (multi-bin mailbox) control
print jobs.
regulations Canadian DOC 46 FCC 46 removing parts 217 safety 222 strategy 222 See also individual parts repair locations, Customer Support Sales Center 66 repetitive defect ruler 463 defects 462 replacement frequencies 119 replacing.
fusing delivery 178, 185, 190, 191 last page (tray 1) 182, 183, 185 last page (tray 2) 180, 185 left cover 185 level sensors (tray 3) 185 lifting plate position 183, 185 names and locations 184 not detecting toner cartridge 399 OHT (overhead transparency) 179, 183, 185 paper (tray 1) 185 paper level (tray 2) 185 paper out (tray 2) 185 paper out (tray 3) 185 photo paper 265 pick-up unit cover 185 pick-up unit paper 178, 185 registration roller paper 178, 179, 183, 185 reverse stepper motor (multi-bin mailbox
lifting plate 183, 189 tray 1 and tray 2 pick-up 189 tray pick-up 181 space requirements 28 specifications acoustic emissions 25 altitude 24 consumable storage 26 electrical 24 humidity 24 media 29 media storage 30 operating environment 24 printer dimensions 25 temperature 24 speeds factors affecting 23 paper feed 179 print 23 springs, tension (2,000-sheet input unit) 313 stacker output bin full 409 stapler 350 calibrating staple position 482 stapler/stacker standalone test 487 statements Finland laser 56 l
formatter video 95 hard disk 95 input trays 96 installation 105 output bins 96 paper path 95, 420 printing color pages 92 sensor 96 tests (2,000-sheet input unit) motor 474 sensor 475 standalone 473 tests (multi-bin mailbox) paper path 478 power-up sequence 478 standalone 477 tests (stapler/stacker) paper path 484 standalone 487 text resolution 23 thermistor fan 177 sensors 185 thermo switches 185 thermographic inks 37 ThinLAN cables, using 77 third-party support 502 timeout for I/O 91 timing charts descrip
transfer kit installing 120 life detection 156 life low 411 life out 411 low and out messages 88 parts list 513 percentage life remaining 94 replace frequency 119 resetting life count 92 transfer roller repetitive defects 465 transparencies automatic detection 179 for ink jet printers 37 parts list 513 print speeds 23 process 179 reducing curl 433 sensors 179, 183, 185 using 35 See also media transport belt (multi-bin mailbox) 210 transport belt motor (multi-bin mailbox) 209, 210, 322 tray 1 assembly 517, 5
U unexpected paper size jams 394 paper size/type 372 unidirectional mode (multi-bin mailbox) 206 unknown media 411 unlatched multi-bin mailbox 480 unlocked toner lever 403 unrecoverable error 387 upper fuser heater 171 fusing roller 136, 153 VTU rollers 204 user guide parts list 514 user interface features 23 user-replaceable parts 224 width of printer 25 wiring diagrams 503 wrinkled pages 433 write protected hard disk 396 wrong page request 481 Y yellow detail value 92 smooth value 92 yellow toner cartri
624 Index EN
Manual Part No. C7096-90967 *C7096-90967* *C7096-90967* Printed on Recycled Paper C7096-90967 HP Color LaserJet 8500/8550 Printer Family Service Manual Copyright© 2000 Hewlett-Packard Co.
