hp LaserJet 1200 Printed on at least 50% Total Recycled Fiber with at least 10% Post-Consumer Paper hp LaserJet 1200 series copyright © 2001 Hewlett-Packard Company Printed in USA service http://www.hp.com/support/lj1200 *C7044-90906* *C7044-90906* C7044-90906 6.5" x 9" BACK COVER 6.5" x 9" FRONT COVER 0.
HP LaserJet 1200 Series Service
Copyright Information Trademark Credits 5 © 2001 Hewlett-Packard Company Microsoft, Windows, and MSDOS are U.S. registered trademarks of Microsoft Corporation. Unplug this product from wall outlets before cleaning. 6 TrueType is a U.S. trademark of Apple Computer, Inc. Do not install or use this product near water or when you are wet. 7 All other products mentioned herein may be trademarks of their respective companies. Install the product securely on a stable surface.
Contents 1 Product information Chapter contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Hardware description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Firmware description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Product specifications. .
3 Maintenance Chapter contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Life expectancies of consumables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 User-replaceable parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Replacing the printer pickup roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Replacing the printer separation pad . . . . . . . . . .
Covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 Left side cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 Optional copier/scanner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 Back cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 Right side cover . . . . . . . . . . . . . . . . . . .
Service mode functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156 NVRAM initialization/cold reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156 PJL software commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156 Troubleshooting tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159 Internal reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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. Figure 37. Figure 38. Figure 39. Figure 40. Figure 41. EN Model and serial number labels . . . . . . . . . . . . . .
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. Figure 75. Figure 76. Figure 77. Figure 78. Figure 79. Figure 80. Figure 81. Figure 82. Figure 83. Figure 84. Figure 85. Figure 86. Figure 87.
Figure 89. Figure 90. Figure 91. Figure 92. Figure 93. Figure 94. EN Internal components (1 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internal components (2 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Paper pickup assembly (1 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Paper pickup assembly (2 of 2) . . . . . . . . . . . . . . . . . . . . . .
10 Figures EN
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. EN Physical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Environmental specifications . . . . . . . . . . . . . . .
12 Chapter - Tables EN
1 Product information Chapter contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Hardware description . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Firmware description . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Product specifications. . . . . . . . . . . . . . . . . . . . . . . . . . 16 Model and serial numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Overview of printer . . . . . . . . . . . . . . . . . . . . . . . .
Introduction The HP LaserJet 1200 printer is designed to: ! Print—Print documents easily with the laser-quality you have come to expect from an HP LaserJet printer. With the optional copier/scanner, you can: ! Copy—Make superior laser-quality copies. With the software, you can make up to 99 copies of a 30-page original. You can also enlarge, reduce, adjust contrast, and collate. ! Scan—Scan important documents to create electronic files.
Firmware description The firmware in the printer includes: ! Enhanced PCL 6 with status readback ! 80 TrueType™ fonts, plus Cyrillic, Greek, Hebrew, and Arabic ! Pixel placement, mosaic characters ! Memory Enhancement technology (MEt) with hardware compression and decompression The printer firmware also has REt and EconoMode functionality. Scan capability includes 600 dpi and 24-bit color.
Product specifications Table 1. Physical specifications Category Specification Height 253 mm (10 inches) without optional copier/ scanner 416 mm (16.4 inches) with optional copier/ scanner Depth 486 mm (19.1 inches) Width 415 mm (16.3 inches) Weight (cartridge installed) 7.3 kg (16.1 lb) without optional copier/scanner 8.7 kg (19.2 lb) with optional copier/scanner Table 2.
Table 3. Power specifications Category Specification Power requirements ! 110 Vac (± 12%), 60 (± 3) Hz; 127 Vac (± 12%), 60 (± 3) Hz -Or! 220 Vac (± 12%), 50/60 (± 3) Hz ! 240 Vac (± 12%), 50 (± 3) Hz Note Power consumption (in continuous copy mode) 285 W Power consumption (idle) 7W Power consumption (off) 0W Minimum recommended circuit capacity 4.5 A at 115 V 2.3 A at 230 V Power sources are not interchangeable. Table 4.
Table 6. Print operating acoustical emissions specifications Category Specification Sound Power Level, LWAd (1 bel = 10 decibels) 6.1 B(A) Sound Pressure Level, LpAm (operator position) 56 dB(A) Sound Pressure Level, LpAm (bystander position) 48 dB(A) Table 7. Copy operating acoustical emissions specifications Category Specification Sound Power Level, LWAd (1 bel = 10 decibels) 6.
Model and serial numbers The model number and serial number are listed on an identification label located on the inside of the toner cartridge door. The serial number contains information about the country of origin, revision level, production code, and production number of the printer. The label also contains power rating and regulatory information. Figure 1.
Overview of printer Front and side view 2 1 8 3 4 7 6 Figure 2.
Back and side view 9 10 16 15 Figure 3.
Overview of optional copier/scanner Top view 1 2 8 3 4 7 5 6 Figure 4. Note Top view 1 Media input tray guides 2 Copier/scanner door 3 Straight-through output door 4 Copier/scanner door release button 5 Long media extensions 6 Media output bin 7 Copier/scanner control panel 8 Media input tray See “Optional copier/scanner” on page 81 for more information about removing the optional copier/scanner from the printer.
Warranty statement DURATION OF WARRANTY: One year from date of purchase. 1 HP warrants to you, the end-user customer, that HP hardware, accessories, and supplies, will be free from defects in materials and workmanship after the date of purchase, for the period specified above. If HP receives notice of such defects during the warranty period, HP will, at its option, either repair or replace products which prove to be defective. Replacement products may be either new or like-new.
7 TO THE EXTENT ALLOWED BY LOCAL LAW, THE REMEDIES IN THIS WARRANTY STATEMENT ARE YOUR SOLE AND EXCLUSIVE REMEDIES. EXCEPT AS INDICATED ABOVE, IN NO EVENT WILL HP OR ITS SUPPLIERS BE LIABLE FOR LOSS OF DATA OR FOR DIRECT, SPECIAL, INCIDENTAL, CONSEQUENTIAL (INCLUDING LOST PROFIT OR DATA), OR OTHER DAMAGE, WHETHER BASED IN CONTRACT, TORT, OR OTHERWISE.
Toner cartridge information The toner cartridge is designed to simplify replacement of the major consumable parts. The toner cartridge contains the printing mechanism and a supply of toner. At five percent page coverage, a toner cartridge will print approximately 2,500 pages. However, a toner cartridge should print more pages if it regularly prints pages with less coverage, such as short memos. The cartridge might print fewer pages if heavy or bold print is used.
26 Chapter 1 - Product information EN
2 Installation and operation Chapter contents Operating environment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Identifying printer components . . . . . . . . . . . . . . . . . . . . . . . . 29 Printer control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Control panel light patterns. . . . . . . . . . . . . . . . . . . . . . 30 Copier/scanner control panel . . . . . . . . . . . . . . . . . . . . 32 Selecting media . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating environment Place the printer on a sturdy, level surface in a well-ventilated area that meets the following environmental requirements: ! temperature: 10° to 32.5° C (50° to 90.5° F) ! humidity: 20% to 80% relative humidity (no condensation) ! away from direct sunlight, open flames, and ammonia fumes ! sufficient space around the printer to allow for proper access and ventilation 253 mm (10.0 inches) 643 mm (25.3 inches) Figure 5. Dimensions of printer 416 mm (16.4 inches) 643 mm (25.
Identifying printer components Printer control panel The printer control panel has two lights and one lighted button. These lights produce patterns that identify the printer status. Ready light (green) Go button and light (green) Attention light (amber) Figure 7. EN Printer control panel ! GO button and light—Prints self-test pages. (To print a self-test page or to continue printing while in manual feed mode, press and release the GO button.
Control panel light patterns Light off Light on Light blinking Figure 8. Light status legend Table 9. Control panel light messages Light status Condition of the printer Action Ready The printer is ready to print. No action is necessary. To print a self-test page, press and release the GO button on the printer control panel. Processing The printer is receiving or processing data. Wait for the job to print. Manual feed or out of memory The printer is in manual feed mode or out of memory.
Table 9. Control panel light messages (continued) Light status Condition of the printer Action Door open, media out, no toner cartridge, or paper jam The printer is in an error state that requires operator intervention or help. ! ! ! ! Printer initialization/Cancel Job/Cleaning Mode A printer initialization is taking place.
Copier/scanner control panel The control panel on the optional copier/scanner has two buttons, COPY and SCAN. COPY button and light (clear) SCAN button and light (clear) Figure 9. Copier/scanner control panel ! Copy—To perform Quick Copies, even if your computer is turned off, press the COPY button. ! Scan—To launch HP LaserJet Director, press the SCAN button.
Selecting media Selecting media to print You can use paper with up to 100 percent recycled fiber content if it meets specifications. To order HP paper or the Print Media Guide for the HP LaserJet printer family, see the user guide. Highly textured stock might not print evenly. Very glossy paper might jam or repel toner. Multipart forms can wrinkle or get jammed in the printer. And paper in poor condition, such as paper with tears, wrinkles, or bent edges, can jam.
Selecting media to copy or scan The copier/scanner for the printer can handle a broader range of media sizes and types than the printer itself can. The following are the supported media sizes: ! Minimum: 45 by 89 mm (1.7 by 3.5 inches) ! Maximum: 216 by 356 mm (8.5 by 14 inches) In addition, you can scan and copy many different types of media that are typically not used for printing, such as newsprint, photographs, business receipts, and business cards.
Loading media Loading media to print Main input tray The main input tray holds up to 250 sheets of 75 g/m2 (20 lb) paper or a 25 mm (0.98 inches) stack of heavier media. Load media with the top forward and the side to be printed facing up. To prevent jams and skew, always adjust the side media guides. Priority input tray The priority input tray holds up to ten pages of 75 g/m2 (20 lb) paper or one envelope, transparency, or card. Load media with the top forward and the side to be printed facing up.
Loading media to copy or scan To load originals in the optional copier/scanner: 1 Load the original with the side to be scanned facing up. If you scan a business card: a Load it with the long side (callout 1) facing forward and the text facing up. b Use the straight-through output path. See the user guide for more information. 2 Adjust the media guides. 3 Press SCAN to scan or press COPY for a copy.
Printer output paths Output bin The output bin is located on the top of the printer. Printed media is collected here in the correct sequence when the straight-through output door is closed. Use the output bin when printing normal and large, collated documents. Extend for long media. Figure 11. Output bin Straight-through output path The straight-through output path is useful when you are printing envelopes, transparencies, heavy media, or any media that tends to curl when printed.
38 Chapter 2 - Installation and operation EN
3 Maintenance Chapter contents Life expectancies of consumables . . . . . . . . . . . . . . . . . . . . . 40 User-replaceable parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Replacing the printer pickup roller . . . . . . . . . . . . . . . . 41 Replacing the printer separation pad . . . . . . . . . . . . . . 43 Replacing the copier/scanner separation pad . . . . . . . 45 Cleaning the equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Cleaning the print path . . . .
Life expectancies of consumables Inspect consumables when servicing the printer. Replace consumables as needed, based on failure or wear, rather than on usage. The following table lists approximate schedules for replacing consumables. Table 11. Life expectancies of consumables Description Part number Estimated life Remarks (pages) Toner cartridge (user replaceable) C7115A 2,500 C7115X 3,500 Printer transfer roller RG9-1483-000CN 25,000 Can affect print quality and/or paper movement.
1 Replacing the printer pickup roller If the printer regularly misfeeds (no media feeds through), you might have to replace or clean the pickup roller. 2 3 4 CAUTION Failure to complete this procedure might damage the printer. 1 Unplug the power cord from the printer, and allow the printer to cool. 2 Open the toner cartridge door, and remove the toner cartridge. 3 Locate the pickup roller.
6 6 Position the new pickup roller in the slot of the previous pickup roller. Note Circular and rectangular pegs on each side prevent you from incorrectly positioning the pickup roller. 7 7 Rotate the top of the new pickup roller into position until the white tabs on each side of the roller snap the roller into place. 8 Reinstall the toner cartridge, and close the toner cartridge door. 9 Plug the printer in to turn it back on.
1 2 Replacing the printer separation pad Note Before you change the separation pad, clean the pickup roller. See “Cleaning the printer pickup roller” on page 49 for instructions. If the input tray feeds more than one page at a time, you might have to replace the printer separation pad. Recurring feed problems indicate that the printer separation pad is worn. 3 1 Unplug the power cord from the printer, and allow the printer to cool. 2 Remove the input trays. 3 Locate the blue separation pad.
6 6 7 Note The tab on the right is larger to help you position the separation pad correctly. 7 8 Snap both sides of the separation pad firmly into place. CAUTION Make sure that the separation pad is straight and that there is no space between the separation pad and the spring-loaded base. If the separation pad is not straight or you see space on one side, remove the separation pad, make sure that the larger tab is on the right, reinsert the separation pad, and snap both sides into place.
1 2 3 Replacing the copier/ scanner separation pad If the optional copier/scanner feeds more than one page at a time, you might have to replace the copier/scanner separation pad. Recurring feed problems indicate that the pad is worn. 1 Unplug the printer to turn the power off, and wait for the copier/scanner to cool. 2 Press the copier/scanner door release button and open the copier/ scanner door. 3 Locate the copier/scanner separation pad and lift it straight up. 4 Press the new pad into place.
Cleaning the equipment WARNING! Before you perform these steps, unplug the printer to avoid shock hazard. To maintain quality, thoroughly clean the printer: ! Any time a new toner cartridge is installed. ! After printing approximately 2,500 pages. ! Whenever print quality problems appear. Clean the outside of the printer with a water-dampened cloth. Clean the inside with only a dry, lint-free cloth (such as a lens tissue).
Cleaning the print path Use this process if you discover toner specks or dots on printouts. This process produces a transparency with toner debris, which should be discarded. Note This process requires a transparency to remove dust and toner from the print paper path. Do not use bond or rough paper. Make sure the transparency you use meets media requirements for the printer. If transparency film is unavailable, you can use paper.
1 Cleaning the toner cartridge area Cleaning the toner cartridge area can improve the quality of your printed sheets. 2 WARNING! Before cleaning the printer, disconnect it from the power source and wait for the printer to cool. 1 Open the toner cartridge door, and remove the toner cartridge. 3 CAUTION To prevent damage, do not expose the toner cartridge to light. Cover the toner cartridge if necessary. Also, do not touch the black sponge transfer roller inside the printer.
1 Cleaning the printer pickup roller If you want to clean the pickup roller rather than replace it, follow the instructions below: 2 Remove the pickup roller as described in steps 1 through 5 of “Replacing the printer pickup roller” on page 41. 1 3 EN Dampen a lint-free cloth in isopropyl alcohol, and scrub the roller. WARNING! Alcohol is flammable. Keep the alcohol and cloth away from an open flame. Before you close the printer and plug in the power cord, allow the alcohol to dry completely.
1 Cleaning the printer separation pad If you want to clean the separation pad rather than replacing it, follow the instructions below: 1 Remove the separation pad as described in steps 1 through 5 of “Replacing the printer separation pad” on page 43. 2 Dab a lint-free cloth in isopropyl alcohol, and scrub the pad. 2 3 4 50 Chapter 3 - Maintenance WARNING! Alcohol is flammable. Keep the alcohol and cloth away from an open flame.
Cleaning and recalibrating the copier/scanner Recalibrating the copier/scanner The optional copier/scanner automatically calibrates to the white sheet opposite the image sensor at the beginning of each scan or copy job. Keep the white sheet clean to make sure the optional copier/scanner calibrates correctly. See “Cleaning the scanner path” on page 51 for information about cleaning the white sheet.
3 4 3 Dampen a clean cotton cloth with isopropyl alcohol (pH7 or neutral pH). With the damp cloth, gently rub back and forth on the white sheet. Also, use the damp cloth to gently rub the rollers. WARNING! Alcohol is flammable. Keep the alcohol and cloth away from an open flame. Allow the alcohol to dry completely before you plug in the power cord. 4 5 Spray glass cleaner on another piece of clean cotton cloth, and carefully clean the glass on the image sensor.
4 Operational overview Chapter contents Basic functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Formatter system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 Draft mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 MEt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 Enhanced I/O . . . . . . . . . . . . . .
Basic functions This chapter presents a functional overview of the printer’s processes. The following systems are discussed: ! formatter ! printer functions • engine control unit (ECU) system/power system • image formation system • paper-feed system (printer) and ! optical system (optional copier/scanner) The printer has an optional copier/scanner. Operation sequences of the printer are controlled by the ECU. Operation sequences of the optional copier/scanner are controlled by the formatter.
Formatter system The formatter is responsible for the following: ! controlling the optional copier/scanner ! formatting and controlling copies ! receiving and processing print data from the printer interface ! monitoring the control panel and relaying printer status information ! developing and coordinating data placement and timing with the print engine ! communicating with the host computer through the bidirectional interface The formatter receives print data from the bidirectional Extended Ca
Control panel ! three front panel status lights (one contained in the GO button) ! GO button Draft mode Depending on which printer driver is used, selecting draft or EconoMode from the printer driver allows the printer to use approximately fifty percent less toner, extending the life of the toner cartridge. MEt HP MEt effectively doubles the standard memory through a variety of font and data-compression methods.
PJL overview Printer Job Language (PJL) is an integral part of configuration, in addition to the standard Printer Command Language (PCL). With standard ECP cabling, PJL allows the printer to perform functions such as: EN ! Two-way communication with the host computer through a bidirectional parallel or USB connection. The printer can tell the host such things as the control panel status. ! Isolation of print environment settings from one print job to the next.
Printer functions Printer functions are divided into five groups: ! engine control ! formatter ! image formation ! laser/scanner ! pickup and feed The following figure is a block diagram of the printer unit: Figure 14.
Engine control unit/power system The engine control unit (ECU) coordinates all print engine activities, drives the laser, and coordinates print data from the formatter with the image formation process. The ECU also includes power supply and distribution circuitry. Note In several other HP LaserJet products, the ECU is also known as the controller PCA or the DC controller PCA.
The following figure shows the various ECU loads: Figure 15.
Printer engine control system Paper motion monitoring and control The ECU controls paper motion in the printer by continuously monitoring the various paper sensors and coordinating the timing with the other print processes. For a detailed explanation of paper movement and the interaction of the photosensors and solenoid with the paper movement process, see “Printer paper-feed system” on page 67. Motor The motor is controlled by the ECU. The motor provides all of the printer paper movement.
Power system on ECU The AC, DC, and high-voltage power supply circuits are all contained within the ECU. AC power distribution The AC power circuitry supplies AC voltage whenever the power cord is connected to the AC power source. AC voltage is distributed to the DC power supply circuitry and to the AC driver circuitry, which controls AC voltage to the fuser assembly heating element. DC power distribution The DC power distribution circuitry, located on the ECU, distributes +3.
High-voltage power distribution The high-voltage power supply applies an overlap of DC and AC voltage to the primary charging roller and the developing roller. This circuit also applies a positive or negative DC voltage to the transfer roller according to the instructions from the engine control unit. This circuit also controls the image density by changing the primary AC voltage and the developing AC bias according to the print density setting. High voltage is disabled when the printer door is open.
Image formation system Laser printing requires the interaction of several different technologies including electronics, optics, and electrophotographics to provide a printed page. Each process functions independently and must be coordinated with the other printer processes. Image formation consists of seven processes: Figure 18.
Breakdown of the seven image formation processes 1 Conditioning stage (primary charging)—This process applies a uniform negative charge to the surface of the drum with the primary charging roller, which is located in the toner cartridge. The primary charging roller is coated with conductive rubber. An AC bias is applied to the roller to erase any residual charges from any previous image.
5 Separation stage—During this process, the media separates from the drum. To stabilize the feed system and prevent toner dropouts on the printed image at low temperature and humidity, the static eliminator reduces the charge on the back of the media. 6 Fusing stage—During this process, the heat and pressure fuse the toner into the media to produce a permanent image. The media passes between a heated fusing element and a soft pressure roller, which melt the toner and press it into the media.
Printer paper-feed system Step 1 The main input tray and the priority input tray merge into one, main input area. Media placed in any of these areas enables the paper-out sensor (PS201), which informs the ECU that media is present. The following steps occur when the printer receives a print job: Step 2 The ECU enables the laser/scanner assembly and the motor. Paper motion begins when the ECU energizes the solenoid (SL001). Step 3 The paper pickup roller rotates once.
Figure 19.
Jam detection The paper-out sensor (PS201) detects the presence of media in either the priority input tray or the main input tray. The paper top sensor (PS402) and the paper delivery sensor (PS401) detect media moving through the printer. If a jam is detected, the ECU immediately stops the printing process and displays a jam message on the control panel.
Solenoid, photosensors, and switches The following figure shows the locations of the solenoid, photosensors, and switches. 1 6 2 3 4 7 5 Figure 20. Note Solenoid, photosensors, and switches 1 Paper delivery sensor (PS401) senses when paper has successfully moved out of the fusing area. 2 Power switch. Products sold in North America do not have power switches. 3 Paper top sensor (PS402) detects the leading and trailing edges of the paper.
Optional copier/scanner The optional copier/scanner consists of the optical system and the document pickup and feed systems. Optical system The optical system, also known as the contact image sensor, contains the following: ! light-emitting diode (LED) array ! contact glass ! rod lens array ! sensor array The light source has three LEDs and is controlled by the formatter. Light reflected from documents passes through the rod lens array and focuses on the sensor array.
Copier/scanner path The following figure shows the copier/scanner path. Figure 21.
Basic sequence of operation (formatter-toprinter) The operation sequence of the printer is controlled by the microprocessor (CPU) on the ECU. The following events take place during normal printer operation: Table 12. Basic sequence of operation Period Purpose Remarks WAIT After the printer is turned on until the end of the initial rotation of the main motor. To clear the drum surface of potential and to clean the primary charging roller. Detects whether or not the cartridge is installed.
Figure 22.
5 Removal and replacement Chapter contents Removal and replacement strategy . . . . . . . . . . . . . . . . . . . . 77 Required tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 Before performing service . . . . . . . . . . . . . . . . . . . . . . 78 Toner cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 Parts removal order . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 Covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pickup roller shaft . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 Paper lift plate assembly . . . . . . . . . . . . . . . . . . . . . . 118 Left plate assembly . . . . . . . . . . . . . . . . . . . . . . . . . . 119 Bottom assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 ECU pan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 Paper-feed assembly. . . . . . . . . . . . . . . . . . . . . . . . .
Removal and replacement strategy This chapter documents the removal and replacement of field replaceable units (FRUs) only. Replacement is generally the reverse of removal. Occasionally, notes are included to provide directions for difficult or critical replacement procedures. WARNING! Unplug the power cord from the power outlet before attempting to service the printer. If this warning is not followed, severe injury can result.
Before performing service ! Remove all media from the printer. ! Unplug the power cable. ! Place the printer on an ESD mat. ! Remove the main input tray. ! If the optional copier/scanner is attached, remove the copier/ scanner media input tray and the copier/scanner output bin. ! Remove the toner cartridge (see page 78). Toner cartridge Note You will feel resistance when you open the toner cartridge door. 1 Open the toner cartridge door, which lifts the toner cartridge toward you.
Parts removal order Use the following diagram to determine which parts must be removed before removing other parts: Pickup roller Separation pad Transfer roller Left side cover Optional copier/scanner Back cover Right side cover Top cover Formatter ECU Solenoid Fan assembly Control panel Front cover assembly Right plate assembly Pickup assembly Pickup roller shaft (ECU) Paper lift plate assembly Paper-feed assembly (Formatter) Left plate assembly Laser/scanner Fuser assembly Output rollers Motor Note
Covers Left side cover 1 Open the toner cartridge door. 2 Pull out on the notch (callout 1) on the back of the cover. 3 Rotate the cover away from the printer. 2 1 Figure 24.
Optional copier/scanner CAUTION Note You must unplug the printer before removing or reinstalling the optional copier/scanner, or you might damage both the printer and the optional copier/scanner. 1 Remove the left side cover (see page 80). 2 Pull up on the ribbon cable to disconnect it from the connector (callout 1) on the formatter. The optional copier/scanner has two tabs that hook into the underside of the printer output bin. Another tab and a pin stabilize the optional copier/scanner in the back.
Back cover 1 Remove the left side cover (see page 80). 2 Open the straight-through output door. 3 Remove two screws (callout 1) from the back of the printer. 2 1 Figure 26.
4 Note Press down and hold the two release levers (callout 1) and pull the cover off of the printer. The back cover has two tabs (not shown), one on each side of the printer. Step 4 releases these two tabs. 2 1 Figure 27.
Right side cover 1 Open the toner cartridge door. 2 Remove the back cover (see page 82). 3 Remove one screw (callout 1) on the back of the printer. 2 1 Figure 28.
4 Lift the right side of the printer and release the tab (callout 1) on the bottom of the cover. 2 1 Figure 29.
5 Figure 30. While continuing to press the release tab, grasp the top of the cover and rotate it away from the printer.
Top cover 1 If the printer has the optional copier/scanner attached, remove it (see page 81). 2 Remove the left side, back, and right side covers (see pages 80 through 86), and open the toner cartridge door. 3 Loosen two screws (callout 1) on the back of the printer. 4 Remove two screws (callout 2) on the top of the printer. 5 Lift the cover off of the printer. 2 2 1 Figure 31.
Control panel assembly Note 1 Remove the left side, back, right side, and top covers (see pages 80 through 87). 2 Disconnect the control panel cable (callout 1) from the formatter. 3 Remove two screws (callout 2 and callout 3) from the top of the control panel assembly. The first screw (callout 2) secures the control panel casing, and the second screw (callout 3) secures the internal bracket. Be sure to hold the assembly together as you remove it.
Front cover assembly The front cover assembly is composed of three pieces: ! front cover (the frame that surrounds the main input tray) ! toner cartridge door ! front guide assembly (the internal shelf that attaches the front cover and the toner cartridge door to the printer) Front cover 1 Remove the left side, back, right side, and top covers (see pages 80 through 87). 2 Close the toner cartridge door. 3 Loosen two screws (one shown, callout 1), one on each side of the cover. 2 1 Figure 33.
4 Pull the top of the front cover away from the printer to release the three tabs (callout 1). 5 Lift the front of the printer to release the tabs on the bottom of the front cover. 6 Remove the front cover. 2 1 Figure 34.
Toner cartridge door Note 1 Remove the left side, back, right side, and top covers (see pages 80 through 87). 2 Remove the control panel assembly (see page 88). 3 Remove the front cover (see page 89). 4 Open the toner cartridge door. 5 Remove one screw (callout 1) from the bracket on the right side of the printer, and remove the bracket. 6 At the right side, press the two small tabs (callout 2) on the inside of the connecting link to release it. 7 Repeat on the left side.
8 Unhook the toner cartridge door hinge on the right side, and slide the toner cartridge door toward the left to remove it. 2 1 Figure 36. Removing the toner cartridge door (2 of 2) To reinstall Lift the toner cartridge door hinge above the stop (callout 1). Otherwise, the toner cartridge door will not close.
Front guide assembly 1 From the front of the printer, remove two screws (callout 1). 2 1 Figure 37.
2 On the right side, release the lower tab (callout 1) and the upper tab (callout 2). 2 1 2 Figure 38.
3 On the left side, release the upper tab (callout 1) and the lower tab (callout 2). 4 Remove the front guide assembly. 2 1 2 Figure 39.
Internal assemblies Transfer roller 1 Open the toner cartridge door and remove the toner cartridge (see page 78). 2 Use needle nose pliers to gently squeeze the two small tabs on the transfer roller. 3 Lift the transfer roller up, slide it to the right, and lift it out of the printer. Figure 40. Removing the transfer roller Note Do not misplace the small grounding spring that is underneath the right side of the transfer roller. CAUTION Do not touch the black sponge portion of the transfer roller.
Formatter 1 Remove the left side cover (see page 80). 2 If the optional copier/scanner assembly is attached to the printer, disconnect the copier/scanner cable (callout 1) from the formatter. 3 Disconnect the two flat flexible cables (callout 2) from the zero insertion force (ZIF) connectors on the formatter. 4 Unplug the laser/scanner cable (callout 3) and the control panel cable (callout 4) from the formatter. 2 1 2 3 2 4 2 Figure 41.
5 Remove five screws (callout 1). 6 Rotate the formatter up and off of the hooks on the chassis and remove it from the printer. 7 Disconnect and remove the formatter shield. 2 1 Figure 42. Removing the formatter (2 of 2) To reinstall When you reconnect the cable, make sure you lock the ZIF connectors back into place.
Laser/scanner assembly 1 Remove the left side, back, right side, and top covers (see pages 80 through 87). 2 Disconnect the flat flexible cable from its socket (callout 1) on the laser/scanner. 3 Disconnect the cable connector (callout 2) from the formatter. 2 1 2 Figure 43.
4 Note Release the two tabs (callout 1), one on each side of the shutter lever, and lift the shutter lever straight up to remove it. Make sure you do not misplace the small spring that is under the shutter lever. 5 Remove four screws (callout 2) and then lift the assembly off of the printer. 2 2 1 Figure 44. Removing the laser/scanner (2 of 2) To reinstall Insert the spring into the hole on the laser/scanner before you snap the shutter lever back into place.
Fuser assembly Note 1 Remove the left side, back, right side, and top covers (see pages 80 through 87). 2 Remove two screws (callout 1) from the right fuser plate. 3 Remove a third screw (callout 2) from behind the large gear on the right fuser plate. You can access the third screw through the holes in the 69Tgear. If you need to realign the 69T gear, you must first remove the pressure roller gear. Release the tab (callout 3) and remove the pressure roller gear from the printer.
5 Remove three screws (callout 1) from the left fuser plate. 6 Remove the bracket. 2 1 Figure 46.
7 Remove two screws (callout 1), one from each side of the printer. 2 1 Figure 47.
8 Unplug the fuser cable connector (callout 1) by pressing and releasing the tab on the back of the connector. 9 Unplug five smaller cable connectors (callout 2) from the ECU and unwind the cables from the fuser assembly. 10 Unplug the spade connector (callout 3). 11 Remove one screw (callout 4) from the paper delivery sensor, and lift the paper delivery sensor out of the printer. 12 Lift the fuser assembly gently out of the printer. 2 4 2 1 2 3 2 Figure 48.
Output rollers Face-down delivery assembly 1 Remove the fuser assembly (see page 101). 2 Remove two screws (callout 1) and lift the face-down delivery assembly away from the fuser assembly. 2 1 Figure 49.
Face-up roller 1 Turn the fuser assembly over. 2 Remove the gear (callout 1) from the face-up roller and release the tab (callout 2) on the face-up roller bushing. 3 Rotate the face-up roller bushing forward until the pin releases. 4 Slide the face-up roller away from the gear side, and lift it out of the fuser assembly. 2 1 2 Figure 50. Removing the output rollers (2 of 2) Reinstall note Flex the face-up roller bushing to pop the pin back into place.
Motor Note You might find it easier to remove the ECU pan (see page 120) before you remove the motor. Remove the left side, back, and right side covers (see pages 80 through 86). 1 Remove the fuser assembly (see page 101). 2 Disconnect the motor cable connector (callout 1) on the side of the motor. 3 Remove the two screws (callout 2) from the motor and lift the motor out of the printer. 2 2 1 Figure 51. Removing the motor To reinstall Make sure that the motor is in the correct position.
Solenoid 1 Remove the left side, back, and right side covers (see pages 80 through 86). 2 Unplug five cable connectors (callout 1) from the ECU and separate the solenoid cable from the other four cables. 3 Carefully unwind the solenoid cable from the cable guides (callout 2). 2 2 1 Figure 52.
4 Remove the screw (callout 1) on the solenoid. 5 Gently thread the solenoid cable through the hole (callout 2) in the right side plate. 6 Lift the solenoid off of the printer. 2 1 2 Figure 53. Removing the solenoid (2 of 2) To reinstall It might be easier to remove the ECU pan (see page 120) before rerouting the cables through the hole (callout 2) in the right side plate.
Fan assembly 1 Remove the left side, back, right side, and top covers (see pages 80 through 87). 2 Unplug the five cable connectors (callout 1) from the ECU and separate the fan cable from the other four cables. 3 Carefully unwind the fan cable from the cable guides (callout 2). 2 2 1 Figure 54.
4 Remove two screws (callout 1). 5 Remove the fan assembly. 6 Gently thread the fan cable through the hole (callout 2) in the right side plate. 7 Lift the fan assembly off of the printer. . 2 1 2 Figure 55. Removing the fan (2 of 2) To reinstall It might be easier to remove the ECU pan (see page 120) before rerouting the cables through the hole (callout 2) in the right side plate.
Right plate assembly 1 Remove the left side, back, right side, and top covers (see pages 80 through 87). 2 Remove the front cover, toner cartridge door, and front guide assembly (see pages 89 through 95). 3 Remove the solenoid (see page 108). 4 Remove the fan assembly (see page 110). 5 Press the small white tab to release the clutch (callout 1), and slide the clutch to the left (toward the pickup roller). Note Make sure that the two halves of the clutch stay together.
6 Remove seven screws (callout 1). If you have not already removed the fuser, remove the fuser screw (callout 2). 7 Lift the right plate assembly off of the printer. 2 1 2 Figure 57.
Pickup assembly 1 Remove the left side, back, right side, and top covers (see pages 80 through 87). 2 Remove the front cover, toner cartridge door, and front guide assembly (see pages 89 through 95). 3 Remove the right plate assembly (see page 112). 4 Remove one screw (callout 1). 2 1 Figure 58.
5 Remove two screws (figure 1) on the top of the assembly. 2 1 Figure 59.
6 Lift the upper metal shield (callout 1) straight up and remove it from the printer. 7 Lift the lower metal shield (callout 2) straight up and remove it from the printer. 2 2 1 Figure 60.
Pickup roller shaft 1 Remove the left side, back, right side, and top covers (see pages 80 through 87). 2 Remove the front cover, toner cartridge door, and front guide assembly (see pages 89 through 95). 3 Remove the right plate assembly (see page 112). 4 Remove the pickup assembly (see page 114). 5 Slide the shaft toward the right until the left end (callout 1) releases. 6 Carefully pull the left end of the shaft toward you until it clears the left side of the chassis.
Paper lift plate assembly Note 1 Remove the left side, back, right side, and top covers (see pages 80 through 87). 2 Remove the front cover, toner cartridge door, and front guide assembly (see pages 89 through 95). 3 Remove the right plate assembly (see page 112), the pickup assembly (see page 114), and the pickup roller shaft (see page 117). 4 Grasp the large plastic tabs (callout 1) on each side of the paper lift plate and rotate it forward. Do not pull on the paper guides.
Left plate assembly 1 Remove the left side, back, right side, and top covers (see pages 80 through 87). 2 Remove the front cover, toner cartridge door, and front guide assembly (see pages 89 through 95). 3 Remove the formatter (see page 97). 4 Remove six screws (callout 1). If you have not already removed the fuser, remove the fuser screw (callout 2). 5 Lift the left plate assembly off of the printer. 2 1 2 Figure 63.
Bottom assemblies ECU pan Remove the left side, back, and right side covers (see pages 80 through 86). 1 Unplug the three spade connectors (callout 1). 2 Disconnect the motor cable connector (callout 2) on the side of the motor. 3 Unplug the fuser cable connector (callout 3) by pressing and releasing the tab on the back of the connector. 4 Unplug all other cable connectors (callout 4) from the ECU. 2 1 2 2 3 2 4 Figure 64.
5 Unplug the flat flexible cable from the ZIF connector (callout 1) on the formatter. 6 Remove two screws (callout 2) on each side of the printer. 2 1 2 Figure 65.
7 Gently pull the two sides of the printer away from the ECU pan to release the ECU pan. 8 Slide the ECU pan out and away from the printer. Note The entire ECU board can be replaced as a single unit. (Only soldered cables ship with the replacement board; if other cables are damaged during removal, you will have to purchase new ones.) Figure 66.
9 Remove five screws (callout 1). 10 Lift the ECU out of the ECU pan. 2 1 Figure 67.
Paper-feed assembly 1 Remove the left side, back, and right side covers (see pages 80 through 86). 2 Remove the right plate assembly (see page 112). 3 Remove the ECU pan (see page 120). 4 Unwind the fan and solenoid cables from the cable guides (callout 1) on the paper-feed mechanism. 5 Remove two screws (callout 2) from the paper-feed mechanism. 6 Remove one screw (callout 3) from the paper sensor PCB assembly. 2 3 2 2 1 Figure 68.
7 Separate two bushings (on the bottom of the paper-feed mechanism) from the paper-feed roller shaft (callout 1), and lift the paper-feed mechanism up and out of the printer. 2 1 2 Figure 69. Removing the paper-feed assembly (2 of 4) To reinstall Insert the bottom of the sensor flag into the hole (callout 2) in front of the paper-feed roller shaft. (See page 127 for more reinstallation notes.
8 Note Use needle nose pliers to push the two tabs away from the end of the paper-feed roller shaft. You might find it easier to first remove the right plate assembly (see page 112). Do not remove the gear shield, because the gears and springs can easily separate and become misplaced. 9 Figure 70. Pull the paper-feed roller shaft toward the left side of the printer and remove it.
To reinstall Insert the two tabs (callout 1) on the paper-feed assembly into the two recesses on the printer. Insert the bottom of the sensor flag into the hole in front of the paperfeed roller shaft (see callout 2 on page 125). The top of the sensor flag (callout 2) should move freely. 2 1 2 Figure 71.
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6 Troubleshooting Chapter contents Basic troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132 Control panel light messages . . . . . . . . . . . . . . . . . . . 132 Fatal error secondary messages . . . . . . . . . . . . . . . . 135 Checking the toner cartridge . . . . . . . . . . . . . . . . . . . 137 Solving image-quality problems . . . . . . . . . . . . . . . . .
Basic troubleshooting Table 13. Basic troubleshooting # Verification steps Possible problems Solutions 1 Does the printer turn on successfully? No power. 1. Verify that the product is plugged in. 2. Verify that the power cable is functional and that the power switch is on (220v only). 3. Verify that FU102 on the ECU is not open. 4. If all of these conditions are correct, replace the ECU. Printer motor does not rotate. 1. Verify that the toner cartridge is present.
Table 13. Basic troubleshooting (continued) # Verification steps Possible problems Solutions 4 Is the software installed correctly? Software is not installed, or an error occurred during software installation. Uninstall and then reload the product software. Make sure you use the correct installation procedure and the correct port setting. 5 Does the product print from the computer? The cable is not connected correctly. Reconnect the cable. An incorrect printer driver is selected.
Errors Control panel light messages Each control panel light message is listed, along with possible causes and steps to resolve identified errors. Figure 72. Control panel location Table 14.
Table 15. Control panel light messages Message Possible causes Solutions No action is needed. The printer is ready to print. To print a self-test page, press and release the GO button on the control panel. EN The printer is receiving or processing data. Wait for the job to print. The printer is in manual feed mode. To turn off the manual feed mode, change the printer property setting. See the “Printer properties” section in the user guide for more information. The printer is out of memory. 1.
Table 15. Control panel light messages (continued) Message Possible causes Solutions A printer initialization is taking place. If all lights blink for a half second or longer in a sequence: ! The printing is initializing. ! All previously sent print jobs are being deleted from the printer memory. ! A cleaning page is printing. No action is necessary. The printer has a fatal error. All lights are on. 1. Turn the printer off and back on. 2.
Fatal error secondary messages If the printer has a fatal error, press and hold the GO button to see the secondary error message. Table 16. Fatal error secondary messages Message EN Cause Solution Engine error. The formatter and engine are not communicating. 1. Unplug the printer and plug it back in. 2. Reseat the formatter to ECU cable. 3. Replace the formatter PCA. 4. Replace the ECU. (See “ECU pan” on page 120.) Laser/scanner error. The laser/scanner has a malfunction. 1.
Table 16. Fatal error secondary messages (continued) Message Cause Solution Formatter internal RAM or ROM error. The RAM or ROM has an error. 1. Unplug the printer and plug it back in. 2. Unplug the printer, remove any optional memory, and turn the printer back on. 3.Check the formatter cable connections. 3. Replace the formatter PCA. (See “Formatter” on page 97.) Fan error. 1. Check the fan cable connections. 2. Replace the fan. (See “Fan assembly” on page 110.) Scan buffer error. 1.
Checking the toner cartridge Image formation defects are many times the result of problems in the toner cartridge. If there is any doubt, always replace the toner cartridge before troubleshooting image defects. Use the following checklist to make sure that the toner cartridge is still operable. " Make sure that the toner cartridge is seated properly. " Inspect the toner cartridge for toner level. " Check the expiration date stamped on the toner cartridge box.
Solving image-quality problems Use the following tables to help solve problems with printed pages. If the problem occurs when printing, see table 17, “Solving print image-quality problems,” on page 138. If the problem occurs when copying or scanning (and if the printer has the optional copier/scanner assembly attached), see table 18, “Solving copying and scanning image-quality problems,” on page 143.
Table 17. Solving print image-quality problems (continued) Problem Cause Solution Toner specks appear on the printed page. . The media you are using does not meet HP’s specifications (for example, it is too moist or too rough). Make sure that the media meets specifications detailed in the Print Media Guide for the HP LaserJet printer family. The printer needs to be cleaned. Clean the printer. (See “Cleaning the print path” on page 47.
Table 17. Solving print image-quality problems (continued) Problem Cause The printed page has a gray background. The priority input tray is not in place. Adjust the priority input tray. The print density setting is set too high. Decrease the amount of background shading through the device configuration utility. The media basis weight is too high. Change the media to a lower basis weight. The humidity level is too low. Very low humidity can increase the amount of background shading.
Table 17. Solving print image-quality problems (continued) Problem Cause Solution Repetitive vertical defects appear on the printed page. If the repetitive mark occurs at equal distance between marks, either the toner cartridge or a printer roller is damaged. Use the defect ruler to identify the spacing. Check the appropriate component and replace if necessary. (See “Repetitive image defect ruler” on page 161.) The internal parts have toner on them.
Table 17. Solving print image-quality problems (continued) Problem Cause Solution The printed page has curls or waves. The environment is too warm or too humid. 1. Both high temperatures and high humidity levels cause media to curl. Move the printer to a different environment. 2. Use a different media. Make sure that the media meets specifications detailed in the Print Media Guide for the HP LaserJet printer family. The media was in the input tray too long.
Solving copying and scanning image-quality problems Table 18. Solving copying and scanning image-quality problems Problem Cause Solution Pages do not print. The printer is not plugged in. Make sure that the printer is plugged into a live wall outlet or power strip. The computer cable is loose. Check that the cable between the printer and the computer is securely connected. The tape was not removed from the toner cartridge. Remove the toner cartridge, remove the tape, and return the toner cartridge.
Table 18. Solving copying and scanning image-quality problems (continued) Problem Cause Solution Copies or scanned images are too light or too dark. The contrast is not set correctly. 1. Adjust the contrast and resolution settings from the HP LaserJet Copier software. 2. Adjust the Quick Copy settings. 3. Check that the contrast and resolution settings are correct. See the user guide for more information. The original image is very light or very dark.
Table 18. Solving copying and scanning image-quality problems (continued) Problem Cause Solution Scanned text is not clear. The contrast, resolution, or brightness needs to be adjusted before scanning. 1. Adjust the contrast and resolution settings from the HP LaserJet Copier. 2. Adjust the Quick Copy settings. 3. Check that the contrast and resolution settings are correct. See the user guide section for more information. The original is on colored paper.
Solving paper-feed problems Use the following tables to solve problems related to moving paper or documents through the printer. If the problem occurs when copying or scanning (and if the printer has the optional copier/scanner assembly attached), see table 20, “Solving copying and scanning paper-feed problems,” on page 148. Otherwise, see table 19, “Solving print paper-feed problems,” on page 146. Solving print paper-feed problems Table 19.
Table 19. Solving print paper-feed problems (continued) Problem Cause Solution The printer feeds multiple sheets or jams frequently from the main input tray or priority input tray. Paper guides are not adjusted properly. Slide the guides against the sides of the stack in the main input tray or the priority input tray to center the paper. Make sure the guides are not adjusted too tightly. Paper was not removed from the main input tray before refilling the tray.
Solving copying and scanning paper-feed problems Table 20. Solving copying and scanning paper-feed problems Problem Cause Solution Long pages stop feeding through the copier/ scanner. The document is too long. The maximum document length is 889 mm (35 inches). If your document is too long, copy each segment of it and scan the copies. The paper delivery sensor is damaged. Free the paper delivery sensor. If you cannot free it, replace it. Scanned items are crooked.
Functional checks Engine test The engine test is used to verify that the print engine is functioning correctly. The formatter is bypassed during an engine test, so the engine test is useful for isolating printer problems. The engine test prints horizontal lines down the entire printable area of a page and is also useful for checking and adjusting registration. Printing an engine test The engine test switch is inside the left cover, below the formatter. To print an engine test, remove the left side cover.
Half self-test functional check The electrophotographic process can be subdivided into the following stages: ! image formation stage (charges the drum and writes a latent image to the drum with the laser) ! development stage (forms a toner image on the drum) ! transfer stage (transfers the image to paper) ! cleaning stage (removes excess toner from the drum) ! fusing stage (applies heat and pressure to make the image on paper permanent) To perform a half self-test check The purpose of the half sel
Drum rotation functional check The photosensitive drum, located in the toner cartridge, must rotate for the print process to work. The photosensitive drum receives its drive from the main drive assembly. Note This test is especially important if refilled toner cartridges have been used. 1 Open the printer door. 2 Remove the toner cartridge. 3 Mark the drive gear on the cartridge with a felt-tipped marker. Note the position of the mark. 4 Install the toner cartridge and close the printer door.
Heating element check Paper passes between the heating element and a soft pressure roller to fuse toner to the paper. Note 1 Unplug the printer for at least ten minutes. 2 Verify that the thermistor connector is seated into both the printer chassis and the ECU. 3 Remove the heating element connector (callout 1) from the ECU. To measure the continuity of the heating element, measure the resistance between the two pins at the end of the cable.
High-voltage power supply check The high-voltage power supply PCA provides the necessary voltages for the electrophotographic processes. To check the toner cartridge connection points Turn the toner cartridge over and visually inspect the three connection points on the ends of the toner cartridge: drum ground (callout 1), charging (callout 2), and developing roller (callout 3). If they are dirty or corroded, clean the connection. If they are damaged, replace the toner cartridge.
To check the high-voltage connector assembly The assembly uses three spring-loaded pins to contact the toner cartridge: drum ground (callout 1), charging (callout 2), and developing roller (callout 3). Verify that the pins are not dirty or corroded and that the spring-loading action is functional. If the pins are dirty, clean them using isopropyl alcohol only. If they are damaged, replace the high voltage connector assembly. 2 1 Figure 77. High-voltage connector assembly (right side) 2 2 3 Figure 78.
Paper path check If paper is not being picked up or is not moving through the paper path, you might want to observe all of the paper motion activities. Overriding the door interlock (SW301) allows you to observe: ! motor rotation ! solenoid action ! kick plate motion ! paper pickup roller motion ! drive roller, transfer roller, fuser roller and gear, and delivery roller motion To override SW301 2 1 Figure 79. EN Overriding SW301 1 Remove the left side cover. (See “Left side cover” on page 80.
Service mode functions NVRAM initialization/cold reset NVRAM initializer sets all default variables stored in NVRAM back to factory default values or to a default ROM value, depending on the variable. It also performs a system reset. NVRAM initializer resets the following: ! all menu settings to factory default values ! factory settings such as formatter number, page counts, factory paper settings To perform NVRAM initialization 1 Turn the printer off. 2 Press and hold down the GO button.
The table below provides a more detailed description of the NVRAM PJL factory variables and commands and shows possible settings for each. Table 21.
NVRAM PJL factory variables To use these commands, you need some method to send PJL commands to the printer, either with a software tool or by copying a binary file that contains the commands from the host using a DOS box.
Troubleshooting tools Internal reports Use the control panel to print self-test pages, which show the print settings. To print a self-test page 1 When the printer is in the ready state, press the GO button. 2 A self-test page will print.
Note Figure 80. These fields are only visible with the optional copier/scanner installed or with the HP LaserJet 1220.
Repetitive image defect ruler First occurrence of print defect Toner/developing cylinder (37.7 mm) Toner/primary charging roller (37.7 mm) Transfer roller (45.2 mm) Heating element (56.5 mm) Pressure roller (62.8 mm) Toner/drum (75.4 mm) Figure 81.
Main wiring Figure 82.
Figure 83.
Locations of connectors Figure 84. Locations of printer connectors Figure 85.
Locations of LEDs, jumpers, and switches Figure 86. Locations of LEDs, jumpers, and switches Table 22.
166 Chapter 6 - Troubleshooting EN
7 Parts and diagrams Chapter contents Ordering parts and supplies . . . . . . . . . . . . . . . . . . . . . . . . . 168 Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168 Related documentation and software . . . . . . . . . . . . . 168 Consumables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169 How to use the parts lists and diagrams . . . . . . . . . . . . . . .
Ordering parts and supplies Parts Order replacement parts from the following website: http://www.hp.com/ssg/parts/direct_order.html Related documentation and software Order documentation and software from the companies listed in table 23; some documentation and software is available at the following websites: Table 23. Technical support websites HP Customer Care Online Software drivers, support documentation, and answers to frequently asked questions http://www.hp.
Accessories Table 24.
Table 24.
How to use the parts lists and diagrams The figures in this chapter illustrate the major subassemblies in the printer and their component parts. A table (material list) follows each exploded assembly diagram. Each table lists the reference designator, the associated part number for the item, and a description of the part. Parts that have no reference designator or part number are not fieldreplaceable units and cannot be ordered.
Assembly locations Printer trays & optional copier/scanner 1 2 6 4 3 5 Figure 87.
Part numbers Table 26. Printer trays and optional copier/scanner EN Ref. Part number 1 RG0-1013-000CN Printer pickup tray assembly Description 1 Qty.
Covers 8 Figure 88.
Part numbers Table 27. Covers EN Ref. Part number Description Qty.
Internal assemblies Internal components (1 of 2) Figure 89.
Part numbers Table 28. Internal components (1 of 2) EN Ref. Part number Description Qty.
Internal components (2 of 2) 12 11 13 Figure 90.
Part numbers Table 29. Internal components (2 of 2) EN Ref. Part number 1 RG0-1022-000CN Front guide assembly Description 1 Qty.
Electrical components Figure 91.
Part numbers Table 30. Electrical components EN Ref. Part number Description Qty.
Paper pickup assembly (1 of 2) 19 28 10 Figure 92.
Part numbers Table 31. Paper pickup assembly (1 of 2) Ref. EN Part number Description Qty.
Paper pickup assembly (2 of 2) Figure 93.
Part numbers Table 32. Paper pickup assembly (2 of 2) EN Ref. Part number Description Qty.
Fuser assembly 18 26 Figure 94.
Part numbers Table 33. Fuser assembly Ref.
Alphabetical parts list Table 34. Alphabetical parts list Description Part number Ref.
Table 34. Alphabetical parts list (continued) Description Part number Ref.
Table 34. Alphabetical parts list (continued) Description Part number Ref.
Numerical parts list Table 35. Numerical parts list Part Number Description Ref.
Table 35. Numerical parts list (continued) Part Number Description Ref.
Table 35. Numerical parts list (continued) Part Number Description RY7-5082-000CN Screw kit (contains a full set of screws for the LaserJet 1200 product) WT2-5694-000CN Clamp, cable EN Ref.
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Index Numerics 69T gear, removing 101 A AC bias 65 AC power distribution 62 accessories, ordering 169 accessory errors, troubleshooting 134 acoustical emissions 18 adding paper 35 ADF, optional copier/scanner capacity 14 feeding problems, troubleshooting 148 adhesive labels, printing 35 alcohol, cleaning with high-voltage connection points 153, 154 pickup roller 49 printer separation pad 50 scanner path 52 alignment specifications 18 troubleshooting 141, 146 alphabetical list, part numbers 188 amber light
checklists preservice 78 toner cartridge inspection 137 troubleshooting 130 checks drum rotation 151 engine 149 half-self-test 150 heating element 152 high-voltage power supply 153 paper path 155 self-test page 159 circuit capacity specifications 17 circuitry, ECU power system 62 classes, HP Technical Training 168 cleaning high-voltage connection points 153, 154 media guides 140 pickup roller 49 print path 47 printer separation pad 50 toner cartridge area 48 cleaning stage, image formation process 66 clippe
delivery sensor, paper (PS401) feeding operations 67 jam detection operations 69 delivery-stationary jams 69 density operations 63 troubleshooting 139 developing roller 63 developing stage, image formation process 65 dimensions, product 16, 28 DIMMs part numbers 169 slots 14 troubleshooting 134 Director, HP LaserJet 32, 131 document feeder, optional copier/scanner capacity 14 feeding problems, troubleshooting 148 documentation ordering 168 doors copier/scanner 22 toner cartridge 20, 91 DOS commands, PJL 158
feed assembly, removing 124 feed system, paper 67 feeding problems, troubleshooting copier/scanner 148 frequent 40 printer 146 field replaceable units (FRUs) part numbers 171 procedures for replacing 77 film, transparency carrier sheets, creating 34 cleaning print path with 47 loading 35 firmware features 15 first page out 14 flashing lights 132 flowchart, troubleshooting 130 focusing lenses, operations 65 fonts, included 15 formatter bypassing 149 copier/scanner operations 71 errors 136 features 14 number,
INTR (Initial Rotation Period) 73 isolated job settings 57 isopropyl alcohol, cleaning with high-voltage connection points 153, 154 pickup roller 49 printer separation pad 50 scanner path 52 J jams copier/scanner 148 detection operations 69 paper input trays 147 preventing 34 JetDirect print servers, ordering 169 K keys.
model number 19 motor copier/scanner (M1) 71 errors 135 operations 61 removing 107 rotation, observing 155 troubleshooting 130 MS-DOS commands, PJL 158 multifeeds See also feeding problems, troubleshooting; jams copier/scanner 45, 148 printer input trays 43, 147 multipart forms 33 N noise specifications 18 Non-Volatile RAM.
paper path cleaning 47 selecting 37 testing 155 paper pickup assembly diagrams and part numbers 172, 182 removing 114 paper pickup roller.
printer pickup roller cleaning 49 life expectancy 40 observing 155 operations 67 replacing 41 shaft, removing 117 printer separation pad cleaning 50 life expectancy 40 operations 67 replacing 43 printing feed problems 146 loading media 35 selecting media 33 troubleshooting 131, 143 priority input tray capacity 33 feeding operations 67 feeding problems, troubleshooting 147 loading 35 locating 20 processor, formatter 55 production code 19 Q quality, troubleshooting copies and scans 143 printed pages 138 repe
sequence operations 73 printed pages 37 removing parts 79 troubleshooting steps 130 serial number 19 SERVICEMODE 158 settings factory defaults, restoring 156 print job 57 reports, printing 159 shaft, pickup roller 117 shields, pickup assembly 116 side covers, removing left 80 right 84 side media guides, locating 20 See also guides signals, VIDEO 73 69T gear, removing 101 size default paper, resetting 156 margins, minimum 138, 143 media 33, 34 printer 16, 28 scanned images 145 skew copies or scans, troublesh
toner cloth, ordering 170 image formation operations 65 loose, troubleshooting 140 redistributing 137 scattered, troubleshooting 142 smears, troubleshooting 140 specks, troubleshooting 139, 142 waste cleaning operations 66 toner cartridge area, cleaning 48 toner cartridge door locating 20 removing 91 toner cartridges checking 137, 153 drum rotation check 151 extending life of 56 high-capacity 14 life expectancies 40 operations 64, 65 part numbers 169 recycling 25 refilled 25 removing 78 tools, required 77 t
hp LaserJet 1200 Printed on at least 50% Total Recycled Fiber with at least 10% Post-Consumer Paper hp LaserJet 1200 series copyright © 2001 Hewlett-Packard Company Printed in USA service http://www.hp.com/support/lj1200 *C7044-90906* *C7044-90906* C7044-90906 6.5" x 9" BACK COVER 6.5" x 9" FRONT COVER 0.
