Manual Part No. C4251-91003 Printed on at least 50% Total Recycled Fiber with at least 10% Post-Consumer Paper *C4251-91003* *C4251-91003* C4251-91003 HP LaserJet 4000 and 4050 Series Printers Service Manual Copyright© 1999 Hewlett-Packard Co.
HP LaserJet 4000 and 4050 Series Printers Service Manual _____________
© Copyright Hewlett-Packard Company 1999 All Rights Reserved. Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws. Publication number C4251-91003 First edition, April 1999 Warranty Trademark Credits The information contained in this document is subject to change without notice. PostScript™ is a trademark of Adobe Systems Incorporated which may be registered in certain jurisdictions.
Contents 1 Printer Description Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Printer Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8 Model and Serial Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8 Site Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Printer Operation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 Using the Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 Control Panel Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 Control Panel Lights. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 Control Panel Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 Settings and Defaults. . . .
5 Functional Information Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 Power Supply System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2 AC/DC Power Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2 Overcurrent Overvoltage Protection . . . . . . . . . . . . . . . . . . . . 5-3 High-voltage Power Distribution . . . . . . . . . . . . . . . . . . . . . . . 5-4 Toner Cartridge Detection . . . . . . . . . . .
6 Removing and Replacing Parts Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 Removal and Replacement Strategy . . . . . . . . . . . . . . . . . . . . . . . 6-2 Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3 Removing Covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6 Rear Right Side Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6 Top Cover . . .
7 Troubleshooting Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 Troubleshooting Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2 Troubleshooting Flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4 Troubleshooting Flowchart (Continued). . . . . . . . . . . . . . . . . . 7-5 Troubleshooting the Printing System . . . . . . . . . . . . . . . . . . . . . . . 7-6 Preliminary Operating Checks . . . . . . . . . . . . .
Contents-6
1 Printer Description Overview This chapter discusses the following: ● Printer Features ● Identification ● Site Requirements ● Paper Specifications ● Safety Information Overview 1-1
Printer Features Table 1-1. Printer Features for the HP LaserJet 4000 Series Printer Speed 17 pages per minute (ppm) 100 MHz RISC microprocessor First page out = 15 sec.
Table 1-1. Printer Features for the HP LaserJet 4000 Series Printer (continued) Paper Trays 100-sheet Tray 1 Size: 3 by 5 in to legal (76 by 127 mm to 216 by 356 mm) ● 500-sheet Tray 2 (HP LaserJet 4000/ 4000 N) Size: letter, legal, A4 ● 250-sheet Trays 2 and 3 (HP LaserJet 4000 T/ 4000 TN) Size: letter, A4, executive, legal, B5 (ISO), B5 (JIS), A5 ● Optional Universal 500-sheet Tray Supports standard and custom sizes from 5.8 by 8.2 in (149 by 210 mm) to 8.5 by 14 in (216 by 356 mm).
Table 1-2. Printer Features for the HP LaserJet 4050 Series Printer Speed 17 pages per minute (ppm) 133 MHz RISC microprocessor First page out = 15 sec.
Table 1-2. Printer Features for the HP LaserJet 4050 Series Printer (continued) Paper Trays 100-sheet Tray 1 Size: 3 by 5 to legal (76 by 127 mm to 216 by 356 mm) ● 500-sheet Tray 2 (HP LaserJet 4050/ 4050 N) Size: letter, legal, A4 ● 250-sheet Trays 2 and 3 (HP LaserJet 4050 T/ 4050 TN) Size: letter, A4, executive, legal, B5 (ISO), B5 (JIS), A5 ● Optional 500-sheet Universal Tray Supports standard and custom sizes from 5.8 by 8.2 in (149 by 210 mm) to 8.5 by 14 in (216 by 356 mm).
Table 1-3.
Table 1-4. Comparison of HP LaserJet 4050 Series Printers HP LaserJet 4050 HP LaserJet 4050 T HP LaserJet 4050 N HP LaserJet 4050 TN Ethernet 10-T/ 10-2 LocalTalk optional optional optional optional 10/100 Base TX optional optional standard standard Max.
Identification Model and Serial Numbers The model number and printer serial number are listed on an identification label located under the top cover on the right side of the printer. The model number is alphanumeric, such as C4253A for the HP LaserJet 4050 N printer. The serial number contains information about the Country of Origin, the Revision Level, the Production Code, and Production Number of the printer. An example of a serial number is USBB123456.
Site Requirements The following environmental specifications must be maintained to ensure the proper operation of the printer. Consider the following points before installing the printer: ● Install in a well-ventilated, dust-free area. ● Install on a hard, flat and continuous surface, with all four printer feet level. Do not install on carpet or other soft surfaces. ● Ensure adequate power is supplied. Printer power requirements are listed in Table 1-5.
Space Requirements 39.67 in (100.76 cm) full length, trays and Rear Output Bin open 16.77 in (42.6 cm) printer only, Rear Output Bin closed 15.4 in (39.0 cm) HP LaserJet 4000/4000 N and 4050/4050 N 18.5 in (46.99 cm) with cover open 13.3 in (34.3 cm) with cover closed HP LaserJet 4000 T/4000 TN and 4050 T/4050 TN 20.1 in (51.19 cm) with cover open 15.5 in (38.
Environmental Requirements Table 1-6. Printer and Toner Cartridge Environmental Conditions Item Operating Storage Temperature 50-91° F (10-32° C) 32 to 95° F (0 to 35°C) Relative Humidity 20-80% RH (with no condensation) 10% to 95% RH Table 1-7. Acoustic Emissions (Per ISO 9296) Printer State Sound Power Printing, 17 pages per minute (ppm) Lwad= 6.6 bels (A) Printing, 8 ppm Lwad= 6.
Paper Specifications The following tables show paper specifications for the HP LaserJet 4000 and 4050 series printer. Table 1-8. Paper Specifications, Tray 1 Supported Paper Dimensions* Minimum Size (custom) 3 by 5 in*** (76 by 127 mm) Maximum Size 8.5 by 14 in (216 by 356 mm) Transparencies Labels Same as minimum and maximum paper sizes listed above. Envelopes * ** *** Weight Capacity** 16 to 53 lb (60 to 199 g/m2) 100 sheets of 20 lb (75 g/m2) paper Thickness: 0.0039 in to 0.0045 in (0.
Table 1-10. Paper Specifications, Trays 2 and 3 (HP LaserJet 4000 T/4000 TN and 4050 T/4050 TN) Supported Paper Dimensions* Letter 8.5 by 11 in (216 by 279 mm) A4 8.3 by 11.7 in (210 by 297 mm) Executive 7.3 by 10.5 in (191 by 267 mm) Legal 8.5 by 14 in (216 by 356 mm) B5 (ISO) (custom***) 6.9 by 9.9 in (176 by 250 mm) B5 (JIS) 7.2 by 10 in (182 by 257 mm) A5 (custom***) 5.8 by 8.
Table 1-11. Paper Specifications, Optional 500-Sheet Universal Tray Supported Paper Dimensions* Letter 8.5 by 11 in (216 by 279 mm) A4 8.3 by 11.7 in (210 by 297 mm) Executive 7.3 by 10.5 in (191 by 267 mm) Executive JIS (custom ***) 8.5 by 13 in (216 by 330 mm) 16K (custom ***) 7.75 by 10.75 in (197 by 273 mm) Legal 8.5 by 14 in (216 by 356 mm) B5 (ISO) (custom***) 6.9 by 9.9 in (176 by 250 mm) B5 (JIS) 7.2 by 10 in (182 by 257 mm) A5 (custom***) 5.8 by 8.
Table 1-12. Paper Specifications, Optional Envelope Feeder Supported Paper Dimensions* Minimum Size 3.5 by 6.3 in (90 by 160 mm) Maximum Size 7 by 10 in (178 by 254 mm) * ** Weight Capacity** 20 to 28 lb (75 to 105 g/m2) 75 envelopes The printer supports a wide range of paper sizes. Check the printer software for supported sizes. Capacity may vary depending on paper weight and thickness, and environmental conditions. Table 1-13.
Guidelines for Using Paper For best results, use conventional 20 lb (75 g/m2) paper. Make sure the paper is of good quality and free of cuts, nicks, tears, spots, loose particles, dust, wrinkles, voids, and curled or bent edges. If you are unsure what type of paper you are loading (such as bond or recycled), check the label on the package of paper. Some paper causes print quality problems, jamming, or damage to the printer. Table 1-14.
Note Do not use letterhead paper that is printed with low-temperature inks, such as those used in some types of thermography. Do not use raised letterhead. The printer uses heat and pressure to fuse Toner to the paper. Make sure that any colored paper or preprinted forms use inks that are compatible with the printer’s temperature (400° F or 205° C). Avoid using paper that has already been used in a printer or copier. Do not print on both sides of envelopes, transparencies, or labels.
Paper Weight Equivalence Table Use this table to determine approximate equivalent points in weight specifications other than U.S. bond weight. For example, to determine the equivalent of 20 lb U.S. bond weight paper in U.S. cover weight, locate the bond weight (in the third row, first column) and scan across the row to the cover weight (in the third column). The equivalent is 28 lb. Shaded areas indicate a standard weight for that grade. Table 1-15. Paper Weight Equivalence Bond wt. Text/book Cover wt.
Labels CAUTION To avoid damaging the printer, use only labels recommended for use in laser printers. If you have problems printing labels, use Tray 1 and open the Rear Output Bin. Never print on the same sheet of labels more than once. Label Construction When selecting labels, consider the quality of each component: ● Adhesives: The adhesive material should be stable at 400° F (205° C), the printer’s maximum temperature. ● Arrangement: Only use labels with no exposed backing between them.
Envelopes Envelope Construction Envelope construction is critical. Envelope fold lines can vary considerably, not only between manufacturers, but also within a box from the same manufacturer. Successful printing on envelopes depends upon the quality of the envelopes. When selecting envelopes, consider the following components: ● Weight: The weight of the envelope paper should not exceed 28 lb (105 g/m2), or jamming may result. ● Construction: Prior to printing, envelopes should lie flat with less than 0.
Envelopes with Double Side Seams Some envelopes have vertical seams at both ends of the envelope, rather than diagonal seams. This style of envelope may be more likely to wrinkle. When using envelopes with double side seams, be sure the seam extends all the way to the corner of the envelope as illustrated below.
Envelope Margins The following table gives typical address margins for a Commercial #10 or DL envelope. Table 1-16. Envelope Margins Note Type of Address Top Margin Left Margin Return Address 0.6 in (15 mm) 0.6 in (15 mm) Delivery Address 2 in (51 mm) 3.5 in (89 mm) For the best print quality, position margins no closer than 0.6 in (15 mm) from the edges of the envelope. Envelope Storage Proper storage of envelopes helps contribute to good print quality. Envelopes should be stored flat.
Card Stock and Heavy Paper Many types of card stock can be printed from Tray 1, including index cards and postcards. Some types of card stock perform better than others because the construction is better suited for feeding through a laser printer. For optimum printer performance, do not use paper heavier than 53 lb (199 g/m2) in Tray 1 or 28 lb (105 g/m2) in other trays.
Safety Information 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. The 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.
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 FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy. If this equipment is not installed and used in accordance with the instructions, it may cause harmful interference to radio communications.
Laser Statement for Finland LASERTURVALLISUUS LUOKAN 1 LASERLAITE KLASS 1 LASER APPARAT HP LaserJet 4000/4000 T/4000 N/4000 TN and 4050/4050 T/4050 N/4050 TN -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 (1993) mukaisesti.
Toner Safety Note Toner may stain clothing. Skin and clothing are best cleaned by removing as much Toner as possible with a dry tissue, then washing with cold water. Hot water causes Toner to melt and permanently fuse into clothing. The Toner Cartridge/Drum Material Safety Data Sheet (MSDS) can be obtained by contacting the HP LaserJet website at: http://www.ljsupplies.com/planetpartners/datasheets.html. If you do not have access to the Internet, call the U.S.
Environmental Product Stewardship Protecting the Environment Hewlett-Packard Company is committed to providing quality products in an environmentally-sound manner. The printer has been designed to minimize impacts on the environment. The printer design eliminates: Ozone Production The printer uses charging rollers in the electrophotographic process and therefore generates no appreciable ozone gas (03). CFC Usage Class I U.S.
2 Service Approach Overview This chapter discusses the following: ● Service Approach ● Parts and Supplies ● Warranty Statement Overview 2-1
Service Approach Repair of the printer normally begins with use of the printer’s internal diagnostics in conjunction with the troubleshooting procedures in Chapter 7. Once a faulty part is located, repair is generally accomplished by assembly level replacement of Field Replaceable Units (FRUs). Some mechanical assemblies may be repaired at the subassembly level. PCA component replacement is not supported by Hewlett-Packard.
Parts and Supplies Ordering Information Field replaceable and accessory part numbers are found in Chapter 8 of this manual. Replacement parts may be ordered from HP’s Service Materials Organization (SMO) or Support Materials Europe (SME), divisions of Product Support Division (PSD). Use only accessories specifically designed for this printer. Accessories can be ordered from an authorized service or support provider. See page 2-6 and page 8-4 for ordering information.
Helpful Documentation Table 2-1 lists part numbers to order documentation. Table 2-1. Helpful Documentation Item Description or Use Part Number HP LaserJet Printer Family Paper Specification Guide A guide to using paper and other print media with HP LaserJet printers. 5040-9072 PCL 5/PJL Technical Reference Documentation Package A guide to using printer commands with HP LaserJet printers.
Table 2-1. Helpful Documentation (continued) Item Description or Use Part Number Service and Support CD-ROM for the HP LaserJet 4050 Printers An interactive training CD-ROM for printer service representatives and customer care specialists. C4251-60106 HP LaserJet 4000 and 4050 Series Printers Service Manual A combined service manual for both series of printers.
Phone Numbers for Ordering ● SMO (Service Materials Organization) 1-800-227-8164 (U.S. only) ● SME (Support Materials Europe) (49 7031) 142253 Exchange Program HP offers remanufactured assemblies for some parts. These are identified in Chapter 8 and can be ordered through Service Materials Organization (SMO) or Support Materials Europe (SME), divisions of Product Support Division (PSD). Consumables Paper and Toner Cartridges can be ordered directly from Hewlett-Packard.
HP Support Assistant Compact Disc This support tool offers a comprehensive online information system designed to provide technical and product information on HP products. To subscribe to the quarterly service in the U.S. or Canada, call (800) 457-1762. In Hong Kong, Indonesia, Malaysia, or Singapore, call Mentor Media at (65) 740-4477. HP FIRST HP FIRST fax-on-demand service will deliver detailed troubleshooting information on common software and troubleshooting tips for your HP product.
Europe, Middle East, and Africa Austria Belgium Dutch French Denmark European International Finland France Germany Hungary Italy Netherlands Norway Portugal Spain Sweden Switzerland French German United Kingdom 0660-8218 0800 1 1906 0800 1 7043 800-10453 +31 20 681 5792 9800-13134 0800-9050900 0130-810061 36 1 461-8222 1678-59020 0800-0222420 800-11319 05 05 313342 900-993123 020-795743 0800-551526 0800-551527 0800-960271 Customer Care Reseller Sales and Service Support Center The Customer Care Reseller S
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 5% page coverage, a Toner Cartridge will print approximately 6,000 or 10,000 pages (depending on the model installed). However, a Toner Cartridge should print more pages if regularly printing pages with less coverage, such as short memos.
Warranty Statement The warranty for this product gives you specific legal rights. There may also be other rights that vary from area to area. Refer to the user’s documentation for the full warranty and supporting warranty information.
3 Printer Operation Overview This chapter discusses the following: ● Using the Control Panel ● Control Panel Menus ● Service Mode ● Testing the Printer ● Resetting the Printer ● System Configuration ● Printer I/O Configuration Overview 3-1
Using the Control Panel Control Panel Layout The printer’s Control Panel consists of the following: READY 2-line display Ready Go Data Item Attention – Value + Cancel Job Figure 3-1 Menu Select Control Panel Layout Control Panel Lights Table 3-1. Control Panel Lights Light Indication Ready The printer is ready to print. Data The printer is processing information. Attention Action is required. See the Control Panel display.
Control Panel Keys Table 3-2. Control Panel Keys Key Function [Go] ● ● ● ● ● ● ● Places the printer either online or offline. Prints any data residing in the printer’s buffer. Allows the printer to resume printing after being offline. Clears most printer messages and places the printer online. Allows the printer to continue printing with an error message such as TRAY X LOAD [TYPE] [SIZE] or UNEXPECTED PAPER SIZE.
Settings and Defaults The printer makes most printing decisions based on either temporary settings or permanent defaults. Note Settings sent from software applications override printer defaults. Table 3-3. Settings and Defaults Setting or Default Explanation Temporary Setting A value set for the current print job by the software application. For example, a request from the software to print three copies instead of the Control Panel default value of one copy is a temporary setting.
Control Panel Menus Press [Menu] for access to all Control Panel menus. When additional trays or other accessories are installed in the printer, new menu items automatically appear. To change a Control Panel setting: Note 1 Press [Menu] until the desired menu appears. 2 Press [Item] until the desired item appears. 3 Press [– Value +] until the desired setting appears. 4 Press [Select] to save the selection.
Quick Copy Jobs Menu This menu provides a list of the quick copy jobs stored on the printer’s hard disk. The user can print or delete these jobs from the Control Panel. Note If there are no quick copy jobs stored on the printer’s hard disk, this menu is not displayed on the Control Panel. Table 3-4. Quick Copy Jobs Menu Item Value [JOBNAME] COPIES=1 3-6 Printer Operation Explanation The name of the person who owns the quick copy job.
Private/Stored Jobs Menu This menu provides a list of the private and stored jobs on the printer’s hard disk. The user can print or delete these jobs from the Control Panel. Note If there are no private or stored jobs on the printer’s hard disk, this menu is not displayed on the Control Panel. Table 3-5. Private/Stored Jobs Menu Item Value Explanation [JOBNAME] The name of the job stored on the printer’s hard disk.
Information Menu This menu contains printer information pages that give details about the printer and its configuration. To print an information page, scroll to the desired page and press [Select]. Table 3-6. Information Menu Item Explanation PRINT MENU MAP The menu map shows the layout and current settings of the Control Panel menu items. PRINT CONFIGURATION The Configuration Page shows the printer’s current configuration.
Paper Handling Menu When paper handling settings are correctly configured through the Control Panel, you can print by choosing the type and size of paper from the printer driver or software application. Some items in this menu (such as duplex and manual feed) can be accessed from a software application, or from the printer driver (if the appropriate driver is installed). Printer driver and software application settings override Control Panel settings. Table 3-7.
Table 3-7. Paper Handling Menu (continued) Item Values Explanation TRAY 1 TYPE= PLAIN For supported paper types see page 1-12. This item appears only when TRAY 1 MODE= CASSETTE. Set the value to TRAY 2 TYPE= PLAIN For supported paper types see page 1-12. Set the value to correspond with the paper type currently loaded in Tray 2. TRAY 3 TYPE= PLAIN For supported paper types see page 1-12. This item appears only when a third paper tray is installed.
Table 3-7. Paper Handling Menu (continued) Item Values Explanation OVERRIDE A4/ LETTER=NO NO YES Choose YES to print on letter size paper when an A4 job is sent, but no A4 size paper is loaded in the printer (or to print on A4 size paper when a letter job is sent, but no letter paper is loaded in the printer). CONFIGURE FUSER MODE MENU=NO NO YES Configure the Fuser mode associated with each paper type. (This is only necessary if you are experiencing problems printing on certain paper types.
Print Quality Menu Some items in this menu can be accessed from a software application, or from the printer driver (if the appropriate driver is installed). Printer driver and software application settings override Control Panel settings. Table 3-8. Print Quality Menu Item Values Explanation RESOLUTION= FASTRES 1200 300 600 FASTRES 1200 PRORES 1200 Select the resolution from the following values: 300: Produces draft print quality at the printer’s maximum speed (17 ppm).
Table 3-8. Print Quality Menu (continued) Item Values Explanation RET=MEDIUM OFF LIGHT MEDIUM DARK Use the printer’s Resolution Enhancement technology (REt) setting to produce print with smooth angles, curves, and edges. REt does not affect print quality when the print resolution is set to ProRes 1200. All other print resolutions, including FastRes 1200, benefit from REt. Note It is best to change the REt setting from the printer driver or software application.
Table 3-8. Print Quality Menu (continued) Item Values Explanation TONER DENSITY=3 1 2 3 4 5 Lighten or darken the print on the page by changing the Toner density setting. The settings range from 1 (light) to 5 (dark), but the default setting of 3 usually produces the best results. Use a lower Toner density setting to save Toner. Note It is best to change the Toner density from the printer driver or software application. (Driver and software settings override Control Panel settings.
Printing Menu Some items in this menu can be accessed from a software application, or from the printer driver (if the appropriate driver is installed). Printer driver and software application settings override Control Panel settings. Table 3-9. Printing Menu Item Values Explanation COPIES=1 1 TO 999 Set the default number of copies by selecting any number from 1 to 999. Press [– Value +] once to change the setting by increments of 1, or hold down [– Value +] to scroll by increments of 10.
Table 3-9. Printing Menu (continued) Item Values Explanation UNIT OF MEASURE= INCHES INCHES MILLIMETERS This item appears only when (110V printers) or CONFIGURE CUSTOM PAPER=YES. Select the unit of measurement for the custom paper size. MILLIMETERS (220V printers) X DIMENSION= 8.5 INCHES (110V printers) or 216 MILLIMETERS 3.00 TO 8.5 INCHES This item appears only when (110V printers) or 76 to 216 MILLIMETERS (220V printers) CONFIGURE CUSTOM PAPER=YES.
Table 3-9. Printing Menu (continued) Item Values Explanation PCL FONT SOURCE=INTERNAL INTERNAL SOFT SLOT 1, 2, OR 3 INTERNAL: Internal fonts. SOFT: Permanent soft fonts. SLOT 1, 2, or 3: Fonts stored in one of the three DIMM slots. Note It is best to set the font source from the printer driver or software application. (Driver and software settings override Control Panel settings.) PCL FONT NUMBER=0 0 TO 999 The printer assigns a number to each font and lists them on the PCL Font List.
Table 3-9. Printing Menu (continued) Item Values Explanation PCL SYMBOL SET=PC-8 PC-8 Select any one of several available symbol sets from the printer’s Control Panel. A symbol set is a unique grouping of all the characters in a font. PC-8 or PC-850 is recommended for line draw characters. many others Note It is best to set the symbol set from the printer driver or software application. (Driver and software settings override Control Panel settings.
Table 3-9. Printing Menu (continued) Item Values Explanation APPEND CR TO LF= NO NO YES Select YES to append a carriage return to each line feed encountered in backward-compatible PCL jobs (pure text, no job control). Some environments, such as UNIX, indicate a new line using only the line feed control code. This option allows the user to append the required carriage return to each line feed. PRINT PS ERRORS=OFF OFF ON Select ON to print the PS error page when PS errors occur.
Configuration Menu Items in this menu affect the printer’s behavior. Configure the printer according to your printing needs. Table 3-10. Configuration Menu Item Values Explanation POWERSAVE= 30 MINUTES OFF 15 MINUTES 30 MINUTES 1 HOUR 2 HOURS 3 HOURS Set the printer to enter PowerSave after it has been idle for a specified amount of time. Turning PowerSave off is not recommended. The PowerSave feature does the following: 1. Minimizes the amount of power consumed by the printer when it is idle. 2.
Table 3-10. Configuration Menu (continued) Item Values Explanation RESOURCE SAVE= OFF OFF ON AUTO Dedicate printer memory to save each language’s permanent resources. (You might need to add memory to the printer in order for this item to appear.) The amount of memory set aside can be different for each installed language. Some languages might have memory set aside for resource saving without requiring all languages to do so.
Table 3-10. Configuration Menu (continued) Item Values Explanation PAGE PROTECT= AUTO AUTO ON This item appears only after a 21 TOO COMPLEX, PRESS GO TO CONTINUE message displays. PAGE Memory Enhancement technology (MEt) attempts to guarantee that all pages will print. If the page does not print, turn PAGE PROTECT to ON. This might increase chances of a 20 INSUFFICIENT MEMORY, PRESS GO TO CONTINUE message. If this occurs, simplify the print job or install additional memory.
Table 3-10. Configuration Menu (continued) Item Values Explanation TONER LOW=CONTINUE CONTINUE STOP Determine how the printer behaves when Toner is low. The TONER LOW message will first appear when the Toner Cartridge is almost out of Toner. (About 100 to 300 sheets can still be printed.) CONTINUE: The printer will continue to print while the TONER LOW message is displayed. STOP: The printer will go offline and wait for further action.
Table 3-10. Configuration Menu (continued) Item Values Explanation JAM RECOVERY= AUTO AUTO ON OFF Determine how the printer behaves when a paper jam occurs. AUTO: The printer automatically selects the best mode for printer jam recovery (usually AUTO). This is the default setting. ON: The printer automatically reprints pages after a paper jam is cleared. OFF: The printer does not reprint pages following a paper jam. Printing performance might be increased with this setting.
Table 3-10. Configuration Menu (continued) Item Values Explanation QUICK COPY JOBS = 32 1 to 50 Specifies the number of quick copy jobs that can be stored on the printer’s hard disk. (HP LaserJet 4050 series printer with hard disk installed only) HELD JOB TIMEOUT = OFF 1 4 1 (HP LaserJet 4050 series printer with hard 1 HOUR HOURS DAY WEEK This setting allows the user to set the timeout value for how long a job will be stored before it is automatically deleted from the held job queue.
I/O Menu Items in the I/O (input/output) Menu affect the communication between the printer and the computer. Table 3-11. I/O Menu Item Values Explanation I/O TIMEOUT=15 5 to 300 Select the I/O timeout period in seconds. (I/O timeout refers to the time, measured in seconds, that the printer waits before ending a print job.) This setting allows you to adjust timeout for best performance. If data from other ports appear in the middle of your print job, increase the timeout value.
Table 3-11. I/O Menu (continued) Item Values Explanation PARALLEL HIGH SPEED=YES YES NO Select the speed at which data is transmitted to the printer. YES: The printer accepts faster parallel communications used for connections with newer computers. NO: The printer accepts slower parallel communications used for connections with older computers. PARALLEL ADV FUNCTIONS=ON ON OFF Turn the bidirectional parallel communication on or off. The default is set for a bidirectional parallel port (IEEE-1284).
Table 3-11. I/O Menu (continued) Item Values Explanation SERIAL ROBUST XON=ON ON OFF This item appears only when SERIAL PACING=XON/XOFF. Select the method for generating XONs. ON: The printer sends an XON when the printer is online and when sufficient buffer space is available. If the host does not receive data within approximately one second, the printer will transmit additional XONs at one second intervals until the host receives data.
EIO Menu (Networked Printers) EIO (enhanced input/output) Menus depend on the particular accessory product installed in an EIO slot of the printer. If the printer contains an HP JetDirect print server EIO card, you can configure basic networking parameters using the EIO Menu. These and other parameters can also be configured through HP JetAdmin. Table 3-12. EIO Menu Item Values Explanation CFG NETWORK=NO NO YES NO: The JetDirect Menu is not accessible. YES: The JetDirect Menu appears.
Table 3-12. EIO Menu (continued) Item Values Explanation CFG TCP/IP=NO NO YES NO: The TCP/IP Menu is not accessible. YES: The TCP/IP Menu appears. In the TCP/IP Menu, you can specify BOOTP=YES for TCP/IP parameters to be automatically loaded from a bootp or DHCP server when the printer is turned on. If you specify BOOTP=NO, you can manually set selected TCP/IP parameters from the Control Panel.
Resets Menu Use this menu with caution. You can lose buffered page data or printer configuration settings when you select these items. Only reset the printer under the following circumstances: ● You want to restore the printer’s default settings. ● Communication between the printer and computer has been interrupted. ● You are using both the serial and parallel I/O ports, and one of the ports is having problems.
Service Mode Service Mode should be used only by authorized service personnel. While in Service Mode, you can: ● Verify and set the page count and serial number. These are displayed on the Configuration Page. ● Set the Cold Reset Default. (This sets the factory default paper size to either Letter or A4). ● Turn the diagnostic functions on or off (for software developers only). ● Clear the Event Log. ● Set the interval at which the PERFORM PRINTER MAINTENANCE message appears on the Control Panel.
Service Menu Figure 3-2 Service Menu Setting the Page Count, Maintenance Count, and Serial Number The page count and printer serial number are stored in non-volatile memory. If it is necessary to replace the Formatter PCA, the page count should be set to the current value to reflect the age of the Print Engine. The procedure for setting the serial number is similar to setting the page count.
Page Count The page count stored in NVRAM and displayed on the Configuration Page printout represents the number of pages which the printer has printed (excluding engine test prints). If it becomes necessary to repair a printer by installing a new Formatter, the page count must be reset so that it represents the age of the printer’s engine rather than the age of the Formatter. The page count value is changed using a different method than is used for other Control Panel values.
Table 3-14. Changing the Page Count (continued) Key Press Display Description [Select] PAGES=0000000 * Advance the cursor one digit to the right. [Value +] PAGES=0010000 * Increase the value of the third digit by one. [Select] PAGES=0010000 * Enter the change to the third digit and advance the cursor one digit to the right. [Select] PAGES=0010000 * Advance the cursor one digit to the right. [Value +] (4 presses) PAGES=0010400 * Increase the value of the fifth digit by four.
MAINTENANCE COUNT in the Service Mode Menu sets the page count interval at which the next service is due for the printer. This is set initially at the factory to 200,000 pages. (For example, the message displays at 200,000 pages. If the Printer Maintenance Kit is installed at 200,114 pages, the message displays 200,000 pages later, at 400,114 pages.) Editing this number is similar to editing the PAGES item above. Serial Number If a Formatter is replaced, then the printer serial number must be reentered.
Testing the Printer When you print a Configuration Page, the printer checks its internal controller and I/O interface, and then prints a test page. You can review the Configuration Page printout to verify proper installation of such options as paper trays or printer languages. For more information, see page 7-52. Engine Test The engine test print can be used to verify that the Print Engine is functioning correctly. For more information, see page 7-11.
Resetting the Printer Cold Reset Cold reset clears all data from the printer memory and sets all the defaults back to the factory settings. CAUTION Performing a Cold Reset resets the HP JetDirect configuration. To avoid making changes to your configuration, remove the HP JetDirect card before performing a cold reset. If possible, print a Configuration Page prior to performing a Cold Reset. This will document current settings for later reference. To perform a Cold Reset: 1 Turn off the printer.
System Configuration MS-DOS System Configuration To communicate properly with the printer, the MS-DOS environment requires the addition or modification of MODE commands in the AUTOEXEC.BAT file. Add or modify the MODE command(s), depending on the interface configuration, as follows: Parallel DOS Commands Most IBM and AT compatible computers default to a parallel printer port.
Serial MS-DOS Commands Most IBM compatible computers default to a parallel printer port. To ensure that information is sent to the serial printer port, type the following MS-DOS commands at the MS-DOS prompt, or include them in the AUTOEXEC.BAT file. MODE COM1: 9600, N, 8, 1, P MODE LPT1: =COM1 For MS-DOS version 4.0 or above, enter: MODE COM1: 9600, N, 8, 1, B MODE LPT1: =COM1 Note These examples assume that you are using serial printer port COM1.
Printer I/O Configuration Parallel Menu The default setting for the HIGH SPEED PARALLEL I/O is YES. If it is set to NO, the interface runs at a slower speed that is compatible with older computers. When the default is set to YES, the parallel interface runs at a higher rate supported by newer computers. Advanced Functions The ADVANCED FUNCTIONS feature of the printer enables bidirectional communications between the printer and the host. The default setting is ON.
Pacing (Handshaking) Pacing (or “handshaking”) is a type of communication between the printer and the computer. This is an important setting in the printer because it allows the printer to tell the computer when to send information. If the printer is unable to receive information, for example, when the print buffer is full or when the printer is out of paper, a signal is sent to the computer to stop sending information.
4 Printer Maintenance Overview This chapter discusses the following: ● Cleaning the Printer and Accessories ● Preventative Maintenance Overview 4-1
Cleaning the Printer and Accessories To maintain high print quality and performance, thoroughly clean the printer and the paper handling accessories: ● Every time you change the Toner Cartridge (run a cleaning page). ● After printing approximately 10,000 pages. ● Whenever print quality problems occur. Clean the outside surfaces with a lightly water-dampened cloth. Clean the inside parts as indicated in Table 4-1. Observe the warning and caution below.
Table 4-1. Cleaning the Printer Component Cleaning Method / Notes Outside Covers Use a water-dampened cloth. Do not use solvents or ammonia-based cleaners. Inside General With a dry lint-free cloth, wipe any dust, spilled Toner, and paper particles from the paper path area, the Registration Roller, and the Toner Cartridge cavity. Paper Pickup, Feed, and Separation Rollers Use a water-dampened, lint-free cloth. Separation Pad Use a dry, lint-free cloth.
Using the Printer Cleaning Page If Toner specks appear on the front or back side of your print jobs, follow the procedure below. From the printer’s Control Panel, do the following: Note 1 Press [Menu] until PRINT QUALITY MENU appears. 2 Press [Item] until CREATE CLEANING PAGE appears. 3 Press [Select] to create the cleaning page. 4 Follow the instructions on the cleaning page to complete the cleaning process.
Preventative Maintenance The preventative maintenance cycle for this printer is every 200,000 pages. To order the maintenance kit see page 8-2. The kit contains the following replacement parts: ● One Fuser ● One Transfer Roller ● One Tray 1 Roller ● Three Feed Rollers ● Three Separation Rollers Refer to the instructions included in the kit for detailed replacement procedures. Reset Maintenance Count After the PM kit has been installed, reset the maintenance count. 1 Turn the printer off.
Expected Life of Components The following table shows the expected life of certain components in the printer. To order parts, see Chapter 8. Table 4-2. Life of Components for the HP LaserJet 4000 and 4050 Series Printer No. Part name Part No.
5 Functional Information Overview This chapter presents a generalized functional overview of the printer and the printing processes.
Power Supply System AC/DC Power Distribution AC power is supplied to the low-voltage power supply circuit in the Engine Controller Board when the power switch (SW1) is turned on. The low-voltage power supply circuit supplies +24 VDC and +3.3 VDC required for the printer. +24 VDC is supplied to drive the main motor, scanner motor and fan, and to the high-voltage power supply. +3.3 VDC is used for sensors and ICs on the engine controller board.
Overcurrent Overvoltage Protection The Fusing Heater Safety Circuit is located on the Engine Controller Board, and constantly monitors the fusing temperature. In case of abnormality, the output from this circuit turns off the relay (RL101) and interrupts the power to the fusing heater. If an increase in the temperature of the Fusing Heater causes the Thermistor Output voltage to exceed about 1.2V (240° C), the output of pin #13 of the comparator (IC301) becomes “L”.
High-voltage Power Distribution Figure 5-2 Engine Controller Board In response to the instructions from the microprocessor (CPU:IC 501) on the Engine Controller Board, this circuit applies the superimposed voltage of DC voltage and AC voltage to the primary charging roller and Developing Cylinder, and a positive or negative DC voltage to the transfer charging roller.
Toner Cartridge Detection The Toner Cartridge has a Toner sensor. The circuit compares the output value of the developing AC bias and the output value from the antenna inside the Cartridge, and outputs the Toner detection signal. The CPU detects the remaining Toner level and the presence of the Cartridge when the developing bias is applied to the Developing Cylinder. The remaining Toner level is always detected when the developing bias is applied.
Engine Controller System The following systems and functions are controlled by the engine controller board: ● DC power distribution (+3.3V DC, +5V DC, +24VA) ● Laser and scanner drive ● Paper motion monitoring and control (photosensors and flags) ● Clutches (tray pickup and Tray 1 feed) ● Engine Test ● Motors (main drive, scanner, and fans) The operation sequences of this printer are controlled by the CPU of this circuit.
Figure 5-3 Engine Controller Board Engine Controller System 5-7
Engine Controller Board Inputs and Outputs Figure 5-4 Engine Controller Board I/O (1 of 4) 5-8 Functional Information
Figure 5-5 Engine Controller Board I/O (2 of 4) Engine Controller System 5-9
Figure 5-6 Engine Controller Board I/O (3 of 4) 5-10 Functional Information
Figure 5-7 Engine Controller Board I/O (4 of 4) Engine Controller System 5-11
Laser and Scanner Drive Based on information received from the Formatter, the Engine Controller Board sends signals to the Laser Scanner Assembly to modulate the Laser Diode on and off and to drive the Laser Scanner motor. See “Image Formation System” on page 5-22 for more information. Paper Motion Monitoring and Control The Engine Controller Board controls paper motion by continuously monitoring the various Paper Sensors and coordinating paper movement with the other print processes.
Motors See “Timing Diagram” on page 5-50 for specific timing details for the printer motors. The Main Motor, MT1, is controlled by the Engine Controller Board. The Main Motor drives the Main Gear Assembly and rotates during the initial rotation period (following power-on), the print period, the last rotation period, or whenever the printer’s Top Cover is opened and closed. Figure 5-8 Main Motor Control The Main Motor is a DC brushless motor and is unified with the motor drive circuit.
The Scanner Motor is controlled and monitored by the Engine Controller Board. It rotates the Scanner Mirror during the initial rotation period and the print period. The Fan Motor is controlled and monitored by the Engine Controller Board. The fan operates at full speed during the printing modes. The Fan turns off in PowerSave mode after the Fuser cools down.
Formatter System The Formatter PCA is responsible for the following: ● Controlling the PowerSave mode ● Receiving and processing print data from the various printer interfaces ● Monitoring Control Panel inputs and relaying printer status information (through the Control Panel and the bidirectional I/O) ● Developing and coordinating data placement and timing with the print engine ● Storing font information ● Communicating with the host computer through the Bidirectional Interface The Formatter PC
Note Printer error messages override the PowerSave message. The printer will enter PowerSave mode at the appropriate time, but the error message will continue to be displayed. Resolution Enhancement technology (REt) The Formatter PCA contains circuitry for Resolution Enhancement technology (REt), which modifies the standard video dot data on its way to the Engine Controller Board to produce “smoothed” black-to-white boundaries.
Input/Output Parallel Interface The Formatter PCA receives incoming data through its Bidirectional Interface (IEEE 1284). The I/O provides high speed and two way communication between the printer and the host, allowing the user to change printer settings and monitor printer status from the host computer. The user may configure the HIGH SPEED item in the Control Panel Menu. The default setting, YES, allows the I/O to run at the higher speeds supported by most newer computers.
Disk The disk accessory is mounted on the rear of the Formatter PCA. The optional greater than 1 GB EIO-based hard drive is used for creating multiple original prints (mopies) and storing forms, fonts, and signatures. Local Talk I/O The printer implements AppleTalk networking protocol through LocalTalk hardware. The LocalTalk network cable (HP P/N 92215N) is connected through the EIO card. The LocalTalk hardware is an optional feature for the HP LaserJet 4000, 4000 T, and 4050 series printers.
Random Access Memory (RAM) The RAM contains the page and I/O buffers and the font storage area. It stores printing and font information received from the host system, and can also serve to temporarily store a full page of print image data before the data is sent to the print engine (see “Page Protect” below). RAM memory capacities for each printer are shown in “Printer Features” on page 1-2. Memory capacity can be increased by adding DIMMs to the Formatter PCA.
Page Protect Page complexity (rules, complex graphics, or dense text) may exceed the printer’s ability to create the page image fast enough to keep pace with the image formation process. If Page Protect is disabled, and a page is too complex, it may print in parts (for example, the top half on one page and the bottom half on the next page). Some print data loss is likely in these instances, and the printer will display the 21 PAGE TOO COMPLEX error message, alternating with PRESS GO TO CONTINUE.
PML PML is a Printer Management Language that allows remote configuration and status readback through the I/O ports. Control Panel The Formatter PCA sends and receives printer status and command data via a Control Panel PCA. See “Using the Control Panel” on page 3-2, and “Printer Messages” on page 7-17 for more information.
Image Formation System The image formation system is the main system in the printer. It consists of six stages: 1. Cleaning 2. Conditioning 3. Writing 4. Developing 5. Transferring 6. Fusing When the Formatter Board sends the print signal to the Engine Controller Board, it drives the Main Motor to rotate the Photosensitive Drum, the Developing Cylinder, the Primary Charging Roller, and the Transfer Charging Roller.
Figure 5-9 Image Formation System After the image has been transferred to the paper, it is then fused onto the paper by heat and pressure at the Fuser.
Toner Cartridge Figure 5-10 Toner Cartridge A major portion of the Image Formation System is contained in the Cartridge as shown in the figure above. The Toner Cartridge is the “heart” of the Image Formation System. It houses the cleaning, conditioning, and developing steps of the process. The Toner Cartridge contains the photosensitive Drum, primary charging roller, developing station, Toner cavity, and cleaning station.
Photosensitive Drum The special properties of the Photosensitive Drum allow an image to be formed on the Drum surface and then transferred to paper. The Drum is an aluminum cylinder. The outside of the cylinder is coated with a layer of organic-photoconductive material (OPC) which is non-toxic. The OPC material has properties similar to a photo-resistor. It becomes electrically conductive when exposed to light.
Cleaning the Drum The cleaning blade is in contact with the surface of the Drum at all times. As the Drum rotates during printing, excess Toner is stored in the waste Toner receptacle.
Conditioning the Drum After the Drum is cleaned, it must be conditioned. This process consists of applying a uniform negative charge on the surface of the Drum with the Primary Charging Roller. The Primary Charging Roller is coated with conductive rubber with an AC bias applied to erase any residual charges and maintain a constant Drum surface to create a uniform negative potential on the Drum surface. The amount of DC voltage is modified by the print density setting.
Writing the Image During the writing process, a modulated Laser Diode projects the beam onto the rotating six-sided Scanning Mirror. As the mirror rotates, the beam reflects off the mirror, through a set of focusing lenses, through a slot in the rear of the Toner Cartridge, and onto the Photosensitive Drum. The beam sweeps the Drum from left to right, discharging the negative potential wherever the beam strikes the surface.
Developing the Image The developing process develops the latent electrostatic image into a visible image on the Drum. The Developing Unit consists of a metallic cylinder that rotates around a fixed magnetic core inside the Toner cavity. Toner is a powdery substance made of black plastic resin bound to iron particles, which is uniformly attracted to the magnetic core of the cylinder.
Transferring the Image During the transferring process the Toner image on the Drum surface is transferred to the paper. A positive charge applied to the back of the paper by the transfer roller causes the negatively charged Toner on the Drum surface to be attracted to the page. The small diameter of the Drum, combined with the stiffness of the paper, causes the paper to peel away from the Drum. The static eliminator teeth also help separate the paper from the Drum.
Image Fusing/Variable Fusing Temperature During the fusing process, the Toner is fused into the paper by heat and pressure to produce a permanent image. The paper passes between a heated Fusing Roller and a soft Pressure Roller. This melts the Toner and presses it into the paper. The Fusing Roller contains a ceramic heating element that provides heat for the fusing process. Fusing temperature is monitored by the Engine Controller Board, via the Thermistor TH901.
Variable Fusing Temperature Figure 5-18 Fusing Temperature Control Variable fusing temperature is a feature that gives the user or service technician the ability to adjust the fusing temperature based on the media being used in the printer. The default mode is normal and should be optimal for most users. There is an optional low and high Fuser mode selection. If very heavy or rough media is being used, then high Fuser mode is beneficial.
Paper Feed System Figure 5-19 Paper Feed Subsystem Paper Feed System 5-33
Figure 5-20 Paper Path The presence of paper in Tray 1 is detected by the Tray 1 Paper Sensor (PS105). Presence of paper in Tray 2 is detected by the Tray 2 Paper Sensor (PS101) for the HP LaserJet 4000, 4000 N, 4050 and 4050 N; and by the Upper Tray Paper Sensor (PS101) or the Lower Tray Paper Sensor (PS102) for the HP LaserJet 4000 T, 4000 TN, 4050 T, and 4050 TN.
and by the six switches (SW600, 601, 602, 603, 604, 605) on the Paper Size Detection PCA for the HP LaserJet 4000 T, 4000 TN, 4050 T, and 4050 TN. While the Main Motor rotates, the Tray 1 Pickup Solenoid (SL102) is turned on, the Tray 1 Pickup Roller rotates, and a sheet of paper is fed into the printer. The paper passes the pre-feed roller, which compensates for the skew of the paper.
Printing from Tray 1 The presence of paper in Tray 1 is detected by the Tray 1 Paper Sensor (PS105). When the Engine Controller Board receives the /PRNT signal from the Formatter, the printer starts the initial rotation phase. (This consists of Main Motor warm-up, Scanner Motor warm-up, high-voltage control sequence and Fuser warm-up.) When the initial rotation phase ends, the Tray 1 Pickup Solenoid (SL102) is turned on.
Figure 5-22 Tray 1 Pickup Paper Feed System 5-37
Printing from Tray 2 When the Formatter inputs the /PRNT signal to the printer, the Main Motor (M1) starts rotation. When the Main Motor reaches its prescribed speed, the Feed Roller Clutch (CL101) and Tray 2 Pickup Solenoid (SL 101 or SL 103) are turned on. (The Tray 2 Pickup Roller, Tray 2 Feed Roller, Separation Roller, and Feed Rollers are driven by the Main Motor rotation.) The Tray 2 Pickup Roller, driven by the Pickup Solenoid, rotates once and picks up the paper in the tray.
Figure 5-24 Tray 2 Pickup Paper Feed System 5-39
Multi-Feed Prevention Mechanism When feeding paper from Tray 2, the printer uses the Separation Roller to prevent multi-feeding. Normally, the Separation Roller is imparted with a rotational force in the same direction as the Feed Roller. However, since the Separation Roller is equipped with a Torque Limiter, it rotates with Feed Roller 1 by transmission of its rotational force via the transported paper.
Printing from the Optional 500-sheet Universal Tray The operation sequences of the Paper Feeder are controlled by the Paper Feeder Driver. A 4-bit microprocessor is used in the Paper Feeder Driver, which controls the sequences of the Paper Feeder and the serial communication with the Engine Controller Board. The Engine Controller Board outputs the pickup command to the Paper Feeder Driver with the necessary timing. The Paper Feeder Driver drives the solenoid in response to the pickup command.
Pickup and Feeding The Paper Feeder picks up the paper from the installed trays and feeds the paper to the printer. The flow of the paper is shown below. Figure 5-27 Paper Feed from Trays The paper size and the presence of the 500-sheet Tray are detected by three switches (SW801, 802, 803) on the Paper Feeder Driver PCA. The relationship between the switch combinations and the paper sizes is the same as for the printer. The Paper Feeder is driven by the Main Motor (M101) of the printer.
The CPU on the Engine Controller Board monitors the conditions of the PS102 for a prescribed period of time after the pickup starts. If the PS102 does not detect paper within that time interval, the CPU turns off the Feed Roller clutch (CL101) to stop the paper after the top of page sensor (PS103) detects the presence of the preceding page. The paper then reaches the Registration Arm, where its skew is corrected.
Envelope Feeder The operation sequences of the Envelope Feeder are controlled by the Envelope Feeder Driver. A 4-bit microprocessor is used in the Envelope Feeder Driver, which controls the sequences of the Envelope Feeder and the serial communication with the Engine Controller Board of the printer. The Engine Controller Board outputs the pickup command to the Paper Feeder Driver with the necessary timing. The Envelope Feeder Driver drives the solenoid in response to the command.
is completed, the Envelope Feeder Driver PCA receives the pickup command from the Engine Controller Board and turns on the envelope pickup solenoid (SL901). The Pickup Roller, Feed Roller and Separation Roller are rotated sequentially by the Main Motor rotation, and an envelope is picked up. Then, any unnecessary envelopes are removed by the Separation Roller, and the envelope is fed to the printer.
Duplexer The operation sequences of the Duplexer are controlled by the Duplexer Driver. A 4-bit microprocessor is used in the Duplexer Driver, which controls the sequences of the Duplexer and the serial communication with the Engine Controller Board. The Duplexer Driver drives the Solenoid, Motors, and Fan according to commands sent from the Engine Controller Board to the Duplexer and Duplex Pickup command via serial communication. The Duplexer also returns its status to the Engine Controller Board.
Figure 5-31 Paper Path for the Duplexer Paper Feed System 5-47
Figure 5-32 Paper Feed for the Duplexer Paper Jam There are four photointerrupters (PS102, PS103, PS106, PS501) in the paper path for detecting the presence of the paper. If the paper does not reach or pass three sensors within the prescribed time, the microprocessor in the Engine Controller Board notifies the Formatter of a paper jam.
Basic Sequence of Operation The Formatter PCA and the Engine Controller Board share information during printer operation. The Interface PCA forms a link which operates as a serial data bus. This allows printer status, command, and dot-image data to be passed between the two PCAs. Table 5-1 shows the general timing of the printer events. The following events take place during normal printer operation: Table 5-1.
Figure 5-33 Timing Diagram 5-50 Functional Information
6 Removing and Replacing Parts Overview This chapter discusses the following: ● Removal and Replacement Strategy ● Removing Covers ● Removing Assemblies ● Separating the Engine Module from the Paper Feed Module Overview 6-1
Removal and Replacement Strategy This chapter describes the complete disassembly of the printer. In every instance, tasks that must be performed before beginning the procedure are listed first. Remove the assemblies in the order listed to prevent damage during re-assembly. To ensure optimum print quality, the printer will prompt to have routine maintenance performed every 200,000 pages. When the message PERFORM PRINTER MAINTENANCE appears on the Control Panel, the Printer Maintenance Kit must be installed.
Tools ● Phillips #2 magnetized screwdriver with 6-inch shaft ● Flat-blade screwdriver with 6-inch shaft ● Needle-nose pliers ● Penlight Screws Used in the Printer All screws used in the printer are Phillips head, which require a Phillips screwdriver. The following figure shows the difference between a Phillips and a Posidriv screwdriver. Note that the Phillips tip has more beveled surfaces. CAUTION Using a Posidriv screwdriver will damage the screw heads. Use Phillips only.
Table 6-1. Screws Used in the Printer Drawing and Description Purpose Used to fasten metal to metal when good electrical contact is needed. Threaded Phillips with captive star washer Used to fasten metal or plastic to plastic mainframes. Silver Self-tapping Phillips screw Used to fasten metal or plastic to plastic mainframes. Black Self-tapping Phillips screw Used to fasten metal or plastic to threaded plastic or metal.
Table 6-1. Screws Used in the Printer (continued) Drawing and Description Purpose Used to anchor Tray 1 Pickup Assembly Long screw (4.8 in/116 mm) Hint To insert self-tapping screws, turn the screw to the left (counter-clockwise) until it clicks, then turn it to the right (clockwise) until it is seated. If a self-tapping screw-hole strips, you must repair the screw-hole or replace the affected assembly.
Removing Covers It is usually best to remove and replace the covers in the order shown. Turn the printer off and unplug the power cord and any cables. Hint Left and right are indicated as you face the front of the printer unless otherwise noted. Rear Right Side Cover Figure 6-2 Removing the Rear Right Side Cover The Formatter and Dual In-line Memory Modules (DIMMs) are located underneath the Right Side Cover.
Top Cover Open the Top Cover and remove the Toner Cartridge. CAUTION To prevent damage to the Toner Cartridge, do not expose it to light for more than a few minutes. To remove the Top Cover, you must remove the Rear Right Side Cover (page 6-6), the Toner Cartridge Drive Arm (page 6-9), the Control Panel Overlay (below) and the Control Panel (page 6-8).
Control Panel Tab Figure 6-4 Removing the Control Panel 1 Using a flat-blade screwdriver, pry each side of the Control Panel upward. 2 Remove the top of the Control Panel from the tab. 3 Disconnect the ribbon cable from the Control Panel.
Toner Cartridge Drive Arm Figure 6-5 Removing the Toner Cartridge Drive Arm 1 Note Remove the Toner Cartridge Drive Arm by using needle-nose pliers to pinch the pin from its hinge on the Top Cover. Be sure to reconnect the Toner Cartridge Drive Arm when you replace the Top Cover, or the Toner Cartridge will not seat properly.
Toner cartridge drive arm Rear screws Top screws Figure 6-6 Removing the Top Cover 2 Remove the four screws holding the Top Cover (two are behind the Rear Output Bin, near the top, and two are on top of the printer under the Top Cover).
Release tab if necessary Figure 6-7 Releasing tabs to lift the Top Cover 3 Squeeze the right front side of the Top Cover to remove it. It may be necessary to use a small flat-blade screwdriver to release the tab inside the small hole. 4 Holding the output assembly in place (located toward the rear of the printer), remove the Top Cover.
Left Side Cover Latch (inside) Figure 6-8 Catches Removing the Left Side Cover 1 Open Tray 1. 2 Release the latch on the left side cover from the inside of the printer. Release the catches on the front side of the cover. 3 Lift the cover upward to release the front top side of the cover, then pull the cover away from the printer.
Front Right Side Cover Latch Figure 6-9 Hint Removing the Front Right Side Cover 1 Release the latch at the top center of the cover. 2 Lift the cover straight up until it is free of the tabs at the bottom and the power switch rod, then pull it away from the printer. When you reinstall the Front Right Side Cover, be sure to reconnect the power switch rod.
Rear Cover/Rear Output Bin Step 2 Step 1 Figure 6-10 Removing the Rear Cover/Rear Output Bin 1 Facing the rear of the printer, pinch the right side of the Rear Output Bin and release the hinge from the slot. 2 Rotate the bin upward and slide it to the right to release the left hinge.
Tray 1 Figure 6-11 Removing Tray 1 from the Front Cover 1 Open Tray 1. 2 Push outward on the two slot hinges to release the pins on Tray 1. 3 Slide the Front Cover to the right and remove it from the three hinges on the bottom.
Figure 6-12 Removing the Tray 1 Sensor Arm Cover 4 Firmly pull both sides of the Tray 1 Sensor Arm Cover toward you until it releases from the shaft. See Figure 6-13, “Detail of the Tray 1 Sensor Arm Cover,” on page 6-17. 5 Rotate Tray 1 downward and remove it from the two hinges.
Figure 6-13 Detail of the Tray 1 Sensor Arm Cover Hint When you reinstall the Tray 1 Sensor Arm Cover be sure the Sensor Arms move freely.
Removing Assemblies The order in which you replace the following assemblies depends on the part needing to be replaced. It is not necessary to remove every assembly. Fuser WARNING! Let the Fuser Assembly cool before disassembly. 1 Figure 6-14 Remove the Rear Cover/Rear Output Bin (page 6-14). Removing the Left and Right Duplex Connector Covers 2 If a Duplexer is installed, remove it.
Figure 6-15 Loosening the captive screws in the Fuser Assembly 3 Loosen the two captive screws on the Fuser Assembly. 4 Pull the Fuser Assembly straight out of the printer.
Formatter Cage Assembly For accessing DIMMs EIO accessory Figure 6-16 Note Removing the Formatter Cage Assembly 1 Print a Configuration Page. The information is necessary to reconfigure the printer after you replace the Formatter. 2 Remove the rear right side cover (page 6-6). The Formatter Cage Assembly is directly underneath. 3 Remove the captive screw and open the DIMM access door to see if any DIMMs are installed. Remove and transfer any DIMMs or EIO accessories if you replace the Formatter.
Output Assembly Brass arm Figure 6-17 White tab Removing the Output Assembly 1 Remove the Top Cover (page 6-7). The Output Assembly is on the top, rear of the printer.
2 Figure 6-18 Facing the rear of the printer, release the 2 latches as follows: Left end of Output Assembly (brass arm) a On the left end of the assembly, rotate the brass arm up 90°. Figure 6-19 Right end of Output Assembly (white tab) b On the right end of the assembly, release the white tab. 3 CAUTION Lift the assembly up and out of the printer. Lift the assembly carefully to avoid damaging the Top Output Bin full sensor flag. When the assembly is replaced, the flag must be able to rotate freely.
Laser Scanner Shutter interlock and plate Figure 6-20 Hint Removing the Laser Scanner 1 Remove the Top Cover (page 6-7). The Laser Scanner is on the top of the printer, tilted toward the rear, and has a yellow label on it. 2 Unplug the 3 connectors as shown. 3 Remove the 4 black screws around the edges of the Laser Scanner. Do not remove the two screws on the cover of the Laser Scanner. 4 Lift the Laser Scanner straight up.
Fan Figure 6-21 Hint Removing the Fan 1 Remove the Top Cover (page 6-7) and the Left Side Cover (page 6-12). The Fan is on the left side of the printer. 2 Unplug the Fan’s connector to the Engine Controller Board. 3 Squeeze the latches on the left and right sides of the Fan cover. 4 Pull the Fan straight out. The cover attaches to the Fan at the top right and bottom left corners. Retain the cover; it is separate from the Replacement Fan.
Main Motor Figure 6-22 Removing the Main Motor 1 Remove the Top Cover (page 6-7) and the Front Right Side Cover (page 6-13). The Main Motor is on the right front side of the printer. 2 Unplug the connector. 3 Remove the 4 silver screws around the corners of the metal plate. 4 Remove the Main Motor from the printer.
Transfer Roller DO NOT TOUCH! (See Hint) Figure 6-23 Removing the Transfer Roller 1 CAUTION Do not touch the black rubber part of the roller. Skin oils on the roller can cause problems with print quality. 2 Hint Open the Top Cover and remove the Toner Cartridge. The Transfer Roller is underneath the Toner Cartridge. Using a flat-blade screwdriver, pry the right end of the metal shaft out of place, then the left end.
Tray 1 Pickup Roller Figure 6-24 Hint Removing the Pickup Roller (shown with Envelope Entrance Cover removed) 1 Open Tray 1. The Tray 1 Pickup Roller is in the center of the Tray 1 Pickup Assembly. 2 Grasp the Envelope Entrance Cover and pull it straight away from the printer. 3 Pry open the blue latch on the roller. 4 Lift the roller out. To replace the roller, make sure the pin in the roller lines up with the hole in the shaft.
Figure 6-25 Detail of the Tray 1 Pickup Roller 6-28 Removing and Replacing Parts
Tray 1 Pickup Assembly 1 Remove the covers (starting on page 6-6): Top Cover, Left Side Cover, Front Right Side Cover, and Tray 1. The Tray 1 Pickup Assembly is on the front of the printer. Envelope feeder gear cover Step 4b Step 4a Figure 6-26 Envelope feeder connector cover Removing the Envelope Feeder Gear Cover 2 Flip down or remove the Envelope Feeder Connector Cover. 3 Remove the Envelope Entrance Cover.
Figure 6-27 Removing the Tray 1 Pickup Assembly – Right Side 5 Disconnect the solenoid cable on the right side of the Tray 1 Pickup Assembly. (Note the way the cables are routed for replacement.
Step 7 Step 8 Step 6 Figure 6-28 Removing the Tray 1 Pickup Assembly – Left Side 6 Unplug the connector to the Engine Controller Board on the left side of the Tray 1 Pickup Assembly. 7 Remove the long screw (4.8 in/116 mm) from the left side of the assembly. 8 Remove the self-tapping screw shown.
Toner cartridge guide Figure 6-29 Removing the Tray 1 Pickup Assembly – Front Side 9 Remove the 3 screws shown. 10 Lift the black Toner Cartridge Guide on the right side of the assembly and pull the assembly straight out of the printer. See page 6-33 for the procedure.
Right Side Toner Cartridge Guide You can lift aside the Right Side Toner Cartridge Guide (instead of removing it) to access the Registration Assembly. It is not necessary to unplug the connectors. Remove the Right Side Toner Cartridge Guide to access the Gear Train. Follow the steps below: 1 Remove the Top Cover (page 6-7), Front Right Side Cover (page 6-13), and Tray 1 (page 6-15). The Right Side Toner Cartridge Guide is on the right front side of the printer.
Registration Assembly Figure 6-31 Removing the Registration Assembly 1 Remove the following covers (starting on page 6-6): Top Cover, Left Side Cover, Front Right Side Cover, and Tray 1. Remove the Tray 1 pickup assembly (page 6-29). The Right Side Toner Cartridge Guide can be lifted without removal (page 6-33). The Registration Assembly is under the Toner Cartridge. 2 Remove the 3 black self-tapping screws shown.
DO NOT REMOVE! Figure 6-32 Detail of screws for the Registration Assembly CAUTION Do not remove the silver screw closest to the Registration Assembly! It holds the spring in place. Take out the silver screw farther from the registration assembly, the one that is under the green handle. 3 Hint Lift the green handle. Remove the 2 black self-tapping screws and the rearmost silver screw shown. See the caution above.
Paper Feed Assembly 1 Remove the following covers (starting on page 6-6): Top Cover, Left Side Cover, Front Right Side Cover, and Tray 1. Remove the Tray 1 Pickup Assembly (page 6-29). The Paper Feed Assembly is on the front of the printer. Note routing Figure 6-33 Unplugging the connector to the Paper Feed Assembly 2 CAUTION Unplug and unroute the 2-pin connector from the right side. For replacement of the Paper Feed Assembly, note the way the wires are routed to the connector.
Figure 6-34 Removing the upper screws from the Paper Feed Assembly 3 Hint Remove the 2 black upper screws. After replacing the Paper Feed Assembly, make sure to insert the 2 upper screws only. The 2 lower screws are for holding the Tray 1 Pickup Assembly in place.
Hint For replacement of the Paper Feed Assembly, orient the clutch properly by inserting it into the slot, as shown.
Formatter Pan Figure 6-36 Removing the Formatter Pan 1 Remove the Top Cover (page 6-7) and the Front Right Side Cover (page 6-13). Remove the Formatter Cage Assembly (page 6-20). The Formatter Pan is on the right rear side. Remove the Formatter Pan in order to split the engine from the tray assembly or to access the Gear Train. 2 Remove the 4 black self-tapping screws. 3 Remove the 3 silver M-3 screws. 4 Pull the Formatter Pan straight out, away from the printer.
Gear Train Toner Cartridge Drive Arm Step 4 Figure 6-37 Note Removing the Gear Train 1 Remove the following covers (starting on page 6-6): Top Cover, Front Right Side Cover, Rear Cover/Rear Output Bin, and Tray 1. Remove the Right Side Toner Cartridge Guide (page 6-33), the Registration Assembly (page 6-34), the Formatter Cage Assembly (page 6-20), and the Formatter Pan (page 6-39). The Gear Train is on the right side of the printer.
Delivery Drive Assembly Figure 6-38 Removing the Delivery Drive Assembly 1 Remove the covers (starting on page 6-6): Top Cover, Left Side Cover, Front Right Side Cover, Rear Cover/Rear Output Bin, and Tray 1. Remove the Output Assembly (page 6-21), Formatter Cage Assembly (page 6-20), Formatter Pan (page 6-39), and Fuser Assembly (page 6-18). The Delivery Drive Assembly is on the right rear side of the printer. 2 Remove the single screw. 3 Unplug the 3-pin connector shown.
Separating the Engine Module from the Paper Feed Module This procedure is the same for printers with a single 500-sheet Tray or two 250-sheet Trays. 1 Figure 6-39 Remove the Rear Right Side cover (page 6-6). Remove the Formatter Cage Assembly (page 6-20), Formatter Pan (page 6-39), and 2 long screws from the Tray 1 Pickup Assembly (See Figure 6-26 on page 6-29 and Figure 6-28 on page 6-31).
Figure 6-40 Separating the Engine from the Paper Feed Module 3 CAUTION Remove the single black, self-tapping screw from the left side of the printer, below the Fan. Lift the Engine carefully, being sure that all cables are disconnected. 4 Lift the Engine away from the Paper Feed Module.
Engine Controller Board Note After you replace the Engine Controller Board, do not forget to readjust the top margin as described on page 6-46. 1 Separate the Engine from the Paper Feed Module (page 6-42).
Facing the front of the Engine Module: 3 Remove 7 screws (shown in Figure 6-41 on page 6-44): • 4 black, self-tapping M4 screws (3 in front and 1 in the right rear) • From the left rear, 3 M3 screws (1 recessed) Figure 6-42 4 Disconnect the spring on the right side from the notch. 5 Disconnect the Power Switch Rod. Removing the Engine Controller Board 6 Hint Lifting from the printer’s left side (the side the Fan is on), tip the board up, then unplug all connectors.
Adjusting the Top Margin When you replace the Engine Controller Board, you must readjust the top margin as follows: Figure 6-43 Location of VR501 1 After setting the VR501 on the Engine Controller Board to the center position (0), load letter or A4 paper in the tray. Press the Engine Test Print Button (located on the left side of the printer, below the vent) to make several test prints.
Measure this distance Figure 6-44 Adjusting the top margin 2 Measure the distance between the edge of the paper and the print pattern. Measure all the test prints and calculate the average. 3 Adjust VR501 so that the margin becomes .08 in (2 mm). Turn VR501 clockwise to decrease the margin or counter-clockwise to increase the margin. 4 Make several test prints again and perform step 2 above. If the top margin is still incorrect, repeat the procedure.
Paper Feed Rollers The following procedure is the same for all HP LaserJet 4000 and 4050 series printers; there are 2 Feed Rollers for the HP LaserJet 4000 T/4000 TN and 4050 T/4050 TN and one Feed Roller for the HP LaserJet 4000/4000 N and 4050/4050 N printers. Figure 6-45 Removing the Paper Feed Rollers (HP LaserJet 4000 T/4000 TN and 4050 T/4050 TN shown) 1 Remove the tray(s) from the Feeder. The Paper Feed Rollers are inside the Feeder.
Separation Rollers Figure 6-46 Removing the Separation Rollers The Separation Rollers are inside the paper trays. 1 Release the latch and lift the cover inside the tray. 2 Pinch the release at the left side of the Roller and slide it off the shaft.
Paper Feed Module Plate Remove the Paper Feed Module Plate to access the Controller PCA. This procedure is the same for one 500-sheet Tray or two 250-sheet Trays. (Small) Figure 6-47 Removing the Paper Feed Module Plate 1 Remove the 7 black self-tapping screws (one of them is recessed in front). 2 Remove 2 small metal-to-metal screws. 3 Lift up the Paper Feed Module Plate to remove it.
Paper Feed Module Gear Train Assembly This procedure is the same for one 500-sheet Tray or two 250-sheet Trays. Unplug connector Figure 6-48 Removing the Gear Train 1 Remove the long recessed screw shown. 2 Unplug the connector (note routing). 3 Lift the gear train upward, away from the Paper Feed Module.
Paper Feed Module Side Rails Remove the Paper Feed Module side rails to access the PCA Controller. This procedure is the same for one 500-sheet Tray or two 250-sheet Trays. (Long screw) Figure 6-49 Unplug connector Removing the Paper Feed Module side rails (HP LaserJet 4000 T/4000 TN and 4050 T/4050 TN shown) 1 To remove the side rails, remove the 4 recessed screws (1 is long). 2 Unplug the connector. 3 Lift the side rails off of the Paper Feed Module.
Lower Paper Feed Module Plate (HP LaserJet 4000 T/4000 TN and 4050 T/4050 TN) Figure 6-50 Removing the lower Paper Feed Module Plate 1 Remove 9 black self-tapping screws. 2 Remove 2 small black M3 screws. 3 Lift up the lower Paper Feed Module Plate to remove it.
PCA Cover (HP LaserJet 4000 T/4000 TN and 4050 T/4050 TN) Figure 6-51 Removing the PCA Cover (HP LaserJet 4000 T/4000 TN and 4050 T/4050 TN) 1 Pinch the left and right sides of the PCA Cover to release it from the side latches. 2 Rotate the PCA Cover downward and toward you to remove it.
PCA Cover (HP LaserJet 4000/4000 N and 4050/4050 N) Figure 6-52 Removing the PCA Cover (HP LaserJet 4000/4000 N and 4050/4050 N) 1 Release the latches shown. 2 Remove the PCA Cover.
PCA Controller This procedure is the same for one 500-sheet Tray or two 250-sheet Trays. Figure 6-53 Removing the PCA Controller 1 Unplug 3 connectors to the PCA Controller. 2 Unclip the left side of the PCA Controller and remove it.
7 Troubleshooting Overview This chapter discusses the following: ● Troubleshooting Process ● Troubleshooting the Printing System ● Reference Diagrams Overview 7-1
Troubleshooting Process The troubleshooting process is a systematic approach that addresses the major problems first, and then other problems as you identify the causes for printer malfunctions and errors. The “Troubleshooting Flowchart” on page 7-4 illustrates the major steps for troubleshooting the printing system. Each heading depicts a major troubleshooting step. A “yes” answer to the questions allows you to proceed to the next major step. A “no” answer indicates that additional testing is needed.
Table 7-1. Major Steps for Troubleshooting (continued) General Paper Path Troubleshooting (page 7-45) Is there a paper jam in the printer? Information Pages (page 7-48) Will the printer print information pages successfully? This section gives information about solving problems in the paper path. This section gives the procedures for printing the information pages and evaluating and correcting the printer’s configuration.
Troubleshooting Flowchart Figure 7-1 Troubleshooting Flowchart (1 of 2) 7-4 Troubleshooting
Troubleshooting Flowchart (Continued) Troubleshooting Flowchart, continued Troubleshooting Process 7-5
Troubleshooting the Printing System Preliminary Operating Checks Prior to troubleshooting a specific printer problem, you should ensure that: Note ● The printer is being maintained on a regular basis as described in Chapter 4. ● The customer is using acceptable paper as specified in the HP Printer Family Paper Specification Guide. ● The printer is positioned on a solid, level surface. ● The line voltage does not vary more than 10% from the nominal rated value as specified on the Power Rating Label.
Power On Note It is important to have the printer’s Control Panel functional as soon as possible in the troubleshooting process so that the printer’s diagnostics can assist in locating printing errors. Table 7-2. Power On Defect or Blank Display Problem Action Is the power cord plugged into the wall and the printer? Is AC and DC power available? Verify. See Table 7-3, “No AC Power,” on page 7-9 and Table 7-4, “No DC Power,” on page 7-10.
Table 7-2. Power On Defect or Blank Display (continued) Problem Action Does the Fan turn on for Note: Fan operation is significant since the Fan is controlled by about 4 seconds when you the printer’s Engine Controller Board. An operational Fan first turn the printer on? indicates the following: 1. AC power is present in the printer. 2. DC power supply is functional (both 24VDC and 3.5VDC are being generated). 3. The Engine Controller Board’s micro-processor is functional. If the Fan is not working: 1.
Table 7-3. No AC Power Cause Action No correct voltage present at the outlet. Plug the power cord into another AC circuit outlet. Inform the customer that the correct line voltage is not available at the outlet. The power cord is not firmly plugged into the printer and the outlet. Insert the power plug firmly. Blown fuse. 1. Check the fuses (FU1 and FU2) on the Engine Controller Board. 2. Replace the fuses if necessary. Defective power switch. Remove the Engine Controller Board.
Table 7-4. No DC Power Cause Action No AC power is supplied. Check the AC power supply. See Table 7-3, “No AC Power,” on page 7-9 The overcurrent/overvoltage detection circuit activated. If the problem is not rectified after the power switch is turned off and on again, find the cause of activation of the overcurrent/overvoltage detection circuit in the power supply. Wait for more than two minutes before turning the printer back on. Blown fuse. 1.
Engine Test The printer has one test pattern (vertical lines). When an image defect appears, a test print can be made to identify the problem. The test print can be made by pressing the test print switch located on the left side of the printer (see Figure 7-2 on page 7-12). A test pattern can be printed by pressing the test print switch once after the Photosensitive Drum has stopped and the printer has entered the standby mode. If the switch is held down, the test pattern is printed continuously.
Figure 7-2 Location of the Engine Test Button Printing an Engine Test To print an engine test, use a non-metallic object (such as a pencil) to press the engine test button. A single test page with vertical lines prints. To print multiple test pages, hold down the engine test button. Display The Control Panel should display READY, OFFLINE, or POWERSAVE ON. For information about errors displayed, access the Event Log (see page 7-13). If the display is blank, see page 7-7.
Event Log Use the Event Log to diagnose and troubleshoot printer errors and intermittent failures. You can either display or print the Event Log. Access the Event Log from the Control Panel’s Information Menu. (Select PRINT EVENT LOG or SHOW EVENT LOG.) The Event Log retains the printer’s last 30 error messages. See the tables starting on page 7-18 for more information about correcting Event Log messages in the printer.
Most recent error (up to 30) Figure 7-3 Sample Event Log 7-14 Troubleshooting
Display the Event Log If the printer cannot print or move any paper, follow these steps to display the Event Log. Otherwise, print the event log. 1 Press [Menu] until INFORMATION MENU appears. 2 Press [Item] until SHOW EVENT LOG appears. 3 Press [Select] to show the Event Log. 4 Press [+] to scroll through the Event Log. 5 Write down the error messages. 6 Check the Event Log for specific error trends in the last 10,000 printed pages. 7 Ask the customer for any observed error trends.
Interpret the Event Log The Event Log is the key tool in troubleshooting printer problems. Figure 7-3 shows a typical Event Log. The Event Log shows the current page count at the top left of the page with the printer’s serial number directly to the right of the page count. The left column is the error sequence number, with the error listed at the top (the highest sequence number is the most recent error logged).
Printer Messages The following tables explain messages that might display on the printer’s Control Panel. Alphabetical printer messages and their meanings are listed in Table 7-5, and numerical printer messages are listed in Table 7-6. Hint If a message persists requesting that you load a tray, or if a message indicates that a previous print job is still in the printer’s memory, press [Go] to print or press [Cancel Job] to clear the job from the printer’s memory.
Table 7-5. Alphabetical Printer Messages Control Panel Message Event Log Explanation Message Recommended Action ACCESS DENIED MENUS LOCKED The Control Panel function you are trying to access has been locked by the network administrator to prevent unauthorized access. Ask the network administrator to unlock the function. BAD DUPLEXER CONNECTION The Duplexer is not connected properly. 1. Re-install the Duplexer. 2.
Table 7-5. Alphabetical Printer Messages (continued) Control Panel Message Event Log Explanation Message Recommended Action CHOSEN LANGUAGE NOT AVAILABLE A print job requested a printer language that does not exist in the printer. The job will not print and will be cleared from memory. 1. Print the job using a driver for a different printer language, or add the requested language to the printer (if available). 2. Press [Go] to continue.
Table 7-5. Alphabetical Printer Messages (continued) Control Panel Message Event Log Explanation Message Recommended Action DISK IS WRITE PROTECTED The EIO disk is protected, Disable the write and no new files can be protection through written to it. HP JetAdmin. EIO n DISK INITIALIZING The disk accessory card takes a long time to initialize. The first parameter is the accessory slot number for this disk accessory card. EIO n DISK NOT FUNCTIONAL The EIO disk is not working correctly.
Table 7-5. Alphabetical Printer Messages (continued) Control Panel Message Event Log Explanation Message Recommended Action ENV FEEDER LOAD [TYPE] [SIZE] There is no envelope in the feeder, the wrong size is loaded in the feeder, or the type and size is set incorrectly in the Control Panel. 1. Load the requested envelope type and size into the Envelope Feeder. 2. Make sure the envelope size and type are set correctly from the Paper Handling Menu in the printer’s Control Panel. 3.
Table 7-5. Alphabetical Printer Messages (continued) Control Panel Message Event Log Explanation Message Recommended Action FLASH IS WRITE PROTECTED The flash DIMM is protected, and no new files can be written to it. Disable the write protection through HP JetAdmin. INITIALIZING If the message displays continually, a DIMM may not be inserted completely. Reseat DIMM(s). INPUT DEVICE CONDITION XX.YY An input paper handling device has a condition that needs attention before printing can resume.
Table 7-5. Alphabetical Printer Messages (continued) Control Panel Message LOADING PROGRAM alternates with DO NOT POWER OFF Event Log Explanation Message Recommended Action Wait for the program to Programs and fonts can be stored on the printer’s load. file system. At bootup time these entities are loaded into RAM. (These entities can take a long time to load into RAM depending on the size and number of entities being loaded.
Table 7-5. Alphabetical Printer Messages (continued) Control Panel Message Event Log Explanation Message Recommended Action MEMORY SETTINGS CHANGED The printer changed its memory settings because it did not have enough memory to use the previous settings for I/O Buffering and Resource Saving. This usually occurs after removing memory from the printer, adding a Duplexer, or adding a printer language.
Table 7-5. Alphabetical Printer Messages (continued) Control Panel Message Event Log Explanation Message Recommended Action RAM DISK DEVICE FAILURE The RAM disk had a critical failure and can no longer be used. 1. Turn the printer off, and then turn the printer on to clear the message. 2. If the message persists, install a new RAM disk. RAM DISK FILE OPERATION FAILED The requested operation could not be performed.
Table 7-5. Alphabetical Printer Messages (continued) Control Panel Message TRAY X EMPTY 7-26 Troubleshooting Event Log Explanation Message The specified tray is empty, but the current job does not need this tray in order to print correctly. If this message appears and the tray contains paper, a sensor could be damaged. PS101 detects paper in Tray 2. PS105 detects paper in Tray 1. PS107 detects paper in Tray 3 (HP LaserJet 4050 T/4050 TN). PS801 detects paper in the optional 500-sheet feeder.
Table 7-5. Alphabetical Printer Messages (continued) Control Panel Message TRAY X LOAD [TYPE] [SIZE] Event Log Explanation Message One of the following occurred: There is no paper loaded in the specified tray, or the paper is not the size requested, or the Control Panel is not set for the size of paper loaded. The tray is not properly adjusted for size. The default paper size is set incorrectly.
Table 7-5. Alphabetical Printer Messages (continued) Control Panel Message Event Log Explanation Message Recommended Action UNABLE TO MOPY JOB Memory or file system failures would not allow a mopy job to occur. Only one copy will be produced. UNSUPPORTED SIZE IN TRAY [YY] An external paper Load a supported paper handling device detected size in the tray. an unsupported paper size. The printer will go offline until the condition is corrected.
Table 7-6. Numerical Printer Messages Control Panel Message Event Log Explanation Message 13.XX PAPER JAM [LOCATION] Recommended Action Paper is jammed at the specified location (and possibly at other locations). If the message persists after all jams have been cleared, a sensor or sensor lever might be stuck or broken. See page 7-45. For all paper jam messages, do the following: 1. Remove jammed paper from the specified location. Check the entire paper path for other pieces of paper in the path. 2.
Table 7-6. Numerical Printer Messages (continued) Control Panel Message Event Log Explanation Message 13.5 PAPER JAM 13.5 13.6 PAPER JAM 13.6 13.10 PAPER JAM 13.10 or 13.22 (LJ 4000 printer only) Paper delay jam at paper reversing area Paper jam at Duplexer. 1. Check the Duplexer and the rear area of the printer for obstructions or damage. 2. Check PS701 and PS703 in the Duplexer for proper operation. Replace the Duplexer if a sensor is defective. 13.20 PAPER JAM 13.20 or 13.
Table 7-6. Numerical Printer Messages (continued) Control Panel Message 20 INSUFFICIENT MEMORY alternates with PRESS GO TO CONTINUE 21 PAGE TOO COMPLEX alternates with PRESS GO TO CONTINUE 22 EIO X BUFFER OVERFLOW alternates with Event Log Explanation Message Recommended Action The printer received more data than can fit in its available memory. You might have tried to transfer too many macros, soft fonts, or complex graphics.
Table 7-6. Numerical Printer Messages (continued) Control Panel Message 22 PARALLEL I/O BUFFER OVERFLOW Event Log Explanation Message Recommended Action PRESS GO TO CONTINUE Too much data was sent to the parallel port. This error can occur if the driver you are using is not IEEE-1284 compliant. For best results, use an HP driver that came with the printer. Check for a loose cable connection and be sure to use a high-quality cable.
Table 7-6. Numerical Printer Messages (continued) Control Panel Message 40 BAD SERIAL TRANSMISSION alternates with PRESS GO TO CONTINUE 40 EIO X BAD TRANSMISSION alternates with PRESS GO TO CONTINUE Event Log Explanation Message Recommended Action The printer encountered an error while transferring data from the computer. The error might have occurred for several reasons: The computer was turned on or off while the printer was online.
Table 7-6. Numerical Printer Messages (continued) Control Panel Message Event Log Explanation Message Recommended Action 41.3 UNEXPECTED PAPER SIZE The paper size you are trying to print is not the same as the settings for the tray. 1. Make sure that all trays are correctly adjusted for size. (The printer will continue trying to print the job until size settings are correct.) If you are trying to print from Tray 1, make sure the printer’s Control Panel setting for paper size is correctly configured.
Table 7-6. Numerical Printer Messages (continued) Control Panel Message Event Log Explanation Message 50.X FUSER ERROR Recommended Action A Fuser error has occurred. X Description: 1 = Low Fuser temperature 2 = Fuser warm up service 3 = High Fuser temperature 4 = Low/Bad line voltage. (Printer hooked up to UPS uninterruptible power supply) 5 = Inconsistent Fuser Turn the printer off, wait 20 minutes, and then turn the printer on. If the message persists, reseat the Fuser.
Table 7-6. Numerical Printer Messages (continued) Control Panel Message Event Log Explanation Message Recommended Action 51.X PRINTER ERROR A loss of beam detect occurred. X Description: 1 = Beam detect error 2 = Laser error 1. Press [Go]. The page containing the error will automatically be reprinted. 2. Turn the printer off and then on. 3. Reseat cables. See the wiring diagrams at the back of this manual. 4. Replace the Laser Scanner. 52.X PRINTER ERROR The Laser Scanner speed is incorrect.
Table 7-6. Numerical Printer Messages (continued) Control Panel Message 53.XY.ZZ PRINTER ERROR Event Log Explanation Message There is a memory error with an accessory. The DIMM that caused the error will not be used. Values of X, Y, and ZZ are as follows: X = DIMM type 0 = ROM 1 = RAM Recommended Action 1. Turn the printer off, and reseat or replace the specified DIMM. 2. Try the DIMM in another slot. 3. Replace the DIMM that caused the error.
Table 7-6. Numerical Printer Messages (continued) Control Panel Message 55 PRINTER ERROR Event Log Explanation Message Recommended Action An internal communications error occurred. 1. Press [Go]. The page containing the error will automatically be reprinted. 2. Check the power at the customer’s location. 3. Replace the Formatter PCA. 4. Replace the Engine Controller Board. 56.X PRINTER ERROR A temporary printing error occurred.
Table 7-6. Numerical Printer Messages (continued) Control Panel Message Event Log Explanation Message Recommended Action 59.X PRINTER ERROR A printing error occurred. X Description: 0 = Motor error 1 = Motor startup error 2 = Motor rotation error 62.X PRINTER ERROR There is a problem with Reseat or replace the the printer’s memory. The specified DIMM. X value refers to the location of the problem: 0 = Internal memory 1 to 4= DIMM slots 1, 2, 3, or 4 64.X PRINTER ERROR A scan buffer error occurred.
Table 7-6. Numerical Printer Messages (continued) Control Panel Message Event Log Explanation Message Recommended Action 68 NVRAM ERROR CHECK SETTINGS An error occurred in the printer’s nonvolatile memory (NVRAM) and one or more printer settings has been reset to its factory default. 1. Print a Configuration Page and check the printer settings to determine which values have changed. 2. Hold down [Cancel Job] while turning the printer on.
Table 7-6. Numerical Printer Messages (continued) Control Panel Message 79.XXXX PRINTER ERROR Event Log Explanation Message The printer detected an error. The numbers (XXXX) indicate the specific type of error. Recommended Action 1. Turn the printer off, and then turn the printer on. 2. Try printing a job from a different software application. If the job prints, go back to the first application and try printing a different file.
Table 7-6. Numerical Printer Messages (continued) Control Panel Message 8X.YYYY 7-42 Troubleshooting Event Log Explanation Message The EIO accessory in slot X has encountered a critical error as specified by YYYY. X Description: 1 = EIO slot 1 – The printer detected an error with the EIO card. 2 = EIO slot 2 – The printer detected an error with the EIO card. 6 = EIO slot 1 – The EIO card detected an error. The EIO card may be defective. 7 = EIO slot 2 – The EIO card detected an error.
The following table lists the disk error numbers reported on either the Printer Collation or Job Storage Disk Error page, which is printed when an error exists. Table 7-7. Mopy Disk Error Messages Disk Error Number Error Description Solution 1 Disk volume not present – it may be uninitialized. • Hard disk: Initialize the hard disk. If the problem persists, replace the hard drive. • RAM disk: Power cycle the printer. 3 A file or directory asked for could not be found.
Disk Error Number Error Description Solution 59 The maximum number of directories has been reached There is a maximum number of directories that can be put on a disk. Stored jobs are stored in directories created for each user. To solve this problem: • Delete all jobs stored for a user. The firmware will automatically delete the directory for a user with no stored jobs. • Delete other directories on the disk. 70 Disk Error • Contact your HP Service and Support Representative.
General Paper Path Troubleshooting Paper jams occur in the printer when paper does not either reach or clear a photosensor along the printer’s paper path in a specific amount of time. If a paper jam occurs, a 13.XX PAPER JAM message is displayed on the printer’s Control Panel. The following table contains general questions you might ask and topics to explore prior to troubleshooting. See the 13.xx section in the Event Log for specific error codes. Table 7-8.
Table 7-8. General Paper Path Troubleshooting Questions (continued) Troubleshooting Check Action Are the paper tray guides set correctly? Ensure that the left-side paper guides for Trays 2 and 3 are set correctly at both the front and rear of the trays, and that the front guide is locked into the correct position. For Tray 4 ensure that all adjustments are set correctly: front, back, and side, at the top and bottom of the tray.
Paper Path Test To perform a Paper Path Test: 1 Press [Menu] until INFORMATION MENU appears. 2 Press [Item] until PRINT PAPER PATH TEST appears. 3 Press [Select]. 4 Press [+] to cycle selections until the desired paper tray appears. 5 Press [Select]. 6 Press [+] until the desired output bin appears (open the Rear Output Bin to print to it). 7 Press [Select]. 8 Press [+] until the desired duplex mode (on or off) appears. 9 Press [Select].
Information Pages From the printer’s Control Panel you can print pages that give details about the printer and its current configuration. The following information pages are described here: ● Menu Map ● Configuration Page ● PCL or PS font list For a complete list of the printer’s information pages, print a Menu Map and see the Information Menu.
Figure 7-5 Sample Menu Map (4000 series printer) Troubleshooting the Printing System 7-49
Figure 7-6 Sample Menu Map (4050 series printer) 7-50 Troubleshooting
Configuration Page Use the Configuration Page to view current printer settings, to help troubleshoot printer problems, or to verify installation of optional accessories, such as memory (DIMMs), paper trays, and printer languages. Note If an HP JetDirect print server EIO card is installed, a JetDirect Configuration Page will print out as well. To print a Configuration Page: 1 Press [Menu] until INFORMATION MENU appears. 2 Press [Item] until PRINT CONFIGURATION appears.
Printer Information Lists the serial number, HP JetSend IP addresses, page counts, and other information for the printer. Memory Lists printer memory, PCL Driver work space (DWS), and I/O buffering and resource saving information. Installed Personalities and Options Lists all printer languages that are installed (such as PCL and PS) and lists options that are installed in each DIMM slot and EIO slot. Security Lists the status of the printer’s Control Panel Lock, Control Panel Password, and disk drive.
Printer Information Lists the serial number, HP JetSend IP addresses, page counts, and other information for the printer. addresses, page counts, and other information for the printer. Memory Lists printer memory, PCL Driver work space (DWS), and I/O buffering and resource saving information. Event Log Lists the number of entries in the log, the maximum number of entries viewable, and the last three entries.
Verify Installed Options Under “Installed Personality” on the Configuration Page, look for options such as hard disk or DIMM types and sizes. Verify that the options which are installed in the printer are reflected on the Configuration Page. If an installed device is not shown, reseat the device and print a new Configuration Page. Image Quality When you are working with customers, obtain a print sample before you begin troubleshooting the printer.
Check the Toner Cartridge Image formation defects are often the result of problems with the Toner Cartridge. If there is any doubt, always replace the Toner Cartridge before troubleshooting image defects. Use the following checklist to ensure that the Toner Cartridge is still operable. ● Ensure that the Toner Cartridge has Toner. Table 7-10. Weights of Toner Cartridges Toner Cartridge Capacity Full Weight Empty Weight 6,000 pages 45.
Note Toner Cartridges are rated for 6,000 or 10,000 images at 5% coverage (depending on the model). It is possible to wear out the gears and the cartridge seals before TONER LOW is displayed if the number of images exceeds 6,000 or 10,000 (depending on the model). See “EconoMode” below. ● Check the surface of the Photosensitive Drum in the cartridge to see if it has been damaged or scratched. Touching the Drum will contaminate the photosensitive surface and may cause spotting and defects during printing.
Image Defects The quality of the printer’s output is subject to the judgment of the user. This section of the manual helps you define print quality defects and understand what factors affect print quality. The print samples shown in the following tables illustrate some print quality defects. Keep copies of print quality defects encountered in the field with an explanation of their causes for future reference. The image defects listed below are covered in the following tables.
Hint If you find a defect that is not depicted, record the probable cause along with the conditions in the printing environment and save a copy of the defect for future reference. Table 7-11. Black Page Possible Cause Action The high-voltage power supply connections are contaminated. Clean the high-voltage power supply terminals. See Figure 7-20, “Engine Controller Board Layout,” on page 7-93. Also clean the high-voltage springs where they contact the Toner Cartridge.
Table 7-12. Blank Page Possible Cause Action No Toner is available for print. Remove sealing tape or replace the Toner Cartridge. Defective laser shutter. Check the laser shutter for free operation when inserting the Toner Cartridge. Toner Cartridge Guide Make sure the guide is installed properly above the damaged, improperly Toner Cartridge. positioned, or missing. No Transfer Roller voltage. Without Transfer Roller voltage, Toner cannot be attracted from the surface of the Drum to the paper.
Table 7-13. Blank Spots Possible Cause Action Paper does not meet printer specifications or is stored improperly. 1. Print a few more pages to see if the problem corrects itself. 2. Turn over the stack of paper in the tray. Also try rotating the paper 180°. 3. Check the paper (or other print media) type and quality. Replace the paper, and advise the customer to use the recommended paper and store it properly. Contaminated or deformed Transfer Roller. Replace the Transfer Roller.
Table 7-14. Creases Possible Cause Action Paper does not meet printer specifications or is stored improperly. 1. Print a few more pages to see if the problem corrects itself. 2. Turn over the stack of paper in the tray. Also try rotating the paper 180°. 3. Check the paper (or other print media) type and quality. Replace the paper, and advise the customer to use the recommended paper and store it properly.
Table 7-15. Curl Possible Cause Action Paper does not meet printer specifications or is stored improperly. 1. Print a few more pages to see if the problem corrects itself. 2. Turn over the stack of paper in the tray. Also try rotating the paper 180°. 3. Check the paper (or other print media) type and quality. Replace the paper, and advise the customer to use the recommended paper and store it properly.
Table 7-16. Contamination on Back Possible Cause Action Contamination inside printer (Tray Separation Roller, Feed Roller, Transfer Roller, Fuser, Toner Cartridge). 1. Print at least 10 pages to see if the problem goes away. 2. Print a cleaning page (page 4-4). Identify and clean the contaminated part according to the “Repetitive Defect Ruler” on page 7-73. If contamination cannot be removed, replace the contaminated part. 3. Check for Toner leaks.
Table 7-17. Distorted Image Possible Cause Action Paper does not meet printer specifications or is stored improperly. 1. Print a few more pages to see if the problem corrects itself. 2. Turn over the stack of paper in the tray. Also try rotating the paper 180°. 3. Check the paper (or other print media) type and quality. Replace the paper, and advise the customer to use the recommended paper and store it properly.
Table 7-18. Dropouts Possible Cause Action Paper might be too smooth. Check the paper (or other print media) type and quality. Printer’s operating Make sure the printer’s operating environment meets environment does not specifications. meet specifications. Wrong Toner density setting. From the print quality menu on the Control Panel, adjust the Toner density setting. Make sure EconoMode is off. Wrong Fuser setting for paper type.
Table 7-20. Gray Background Possible Cause Action Paper does not meet printer specifications or is stored improperly. 1. Print a few more pages to see if the problem corrects itself. 2. Turn over the stack of paper in the tray. Also try rotating the paper 180°. 3. Check the paper (or other print media) type and quality. Replace the paper, and advise the customer to use the recommended paper and store it properly.
Table 7-21. Horizontal Black Lines Possible Cause Action Defective Laser Scanner Assembly or Engine Controller Board. 1. See the “Repetitive Defect Ruler” on page 7-73. 2. Reseat connectors on the Laser Scanner and Engine Controller Board. 3. Replace the Laser Scanner Assembly followed by the Engine Controller Board, if necessary. Table 7-22. Horizontal Smudges Possible Cause Action Paper path contamination or damage. 1. See the “Repetitive Defect Ruler” on page 7-73. 2.
Table 7-24. Light Print, Dark Print, or Fade Possible Cause Action Wrong Toner density setting. From the print quality menu on the Control Panel, adjust the Toner density setting. Make sure EconoMode is off. Toner Cartridge is low. Replace the Toner Cartridge. Transfer Roller is defective. Replace the Transfer Roller. Paper does not meet printer specifications or is stored improperly. 1. Print a few more pages to see if the problem corrects itself. 2. Turn over the stack of paper in the tray.
Table 7-25. Loose Toner Possible Cause Action Contamination in the printer. 1. Print a few more pages to see if the problem corrects itself. 2. Clean the inside of the printer (page 4-2) or use the printer’s cleaning page (page 4-4). Toner Cartridge is defective. Replace the Toner Cartridge. Paper might be too smooth. Check the paper (or other print media) type and quality. Wrong Fuser setting for paper type.
Table 7-27. Skew Possible Cause Action Paper does not meet printer specifications or is stored improperly. 1. Print a few more pages to see if the problem corrects itself. 2. Turn over the stack of paper in the tray. Also try rotating the paper 180°. 3. Check the paper (or other print media) type and quality. Replace the paper, and advise the customer to use the recommended paper and store it properly.
Table 7-29. Toner Specks Possible Cause Action Contamination in printer. 1. Print a few more pages to see if the problem corrects itself. 2. Clean the inside of the printer (page 4-2) or use the printer’s cleaning page (page 4-4). Paper does not meet printer specifications or is stored improperly. 1. Print a few more pages to see if the problem corrects itself. 2. Turn over the stack of paper in the tray. Also try rotating the paper 180°. 3. Check the paper (or other print media) type and quality.
Table 7-31. Vertical Dots Possible Cause Action Contaminated Static Eliminator teeth. Clean the Static Eliminator. Poor contact between Clean the contacts, if contaminated. If the problem the Static Eliminator remains after cleaning, or parts are damaged or and the Engine deformed, replace them. Controller Board. Deformed or deteriorated Transfer Roller. Replace the Transfer Roller. Defective Engine Controller Board. Replace the Engine Controller Board. Table 7-32.
Repetitive Defect Ruler Repetitive print defects are usually associated with a specific roller within the printer or the Toner Cartridge. Use Figure 7-9 to isolate the cause of repetitive print defects. Align the first occurrence of the defect with the top of the “ruler” and measure to the next occurrence of the defect to determine the roller in question. When you are certain that your defect pattern matches the pattern of the ruler, replace the indicated roller.
Image System Troubleshooting Half Self Test Functional Check The electrophotographic process can be subdivided into the following stages: ● Cleaning (removes excess Toner from Drum surface) ● Conditioning (places a uniform electrical charge on Drum) ● Writing (laser strikes surface of Drum and creates latent image) ● Developing (forms the Toner image on Drum) ● Transferring (charge transfers the image to paper) ● Fusing (heat and pressure produces a permanent image) The purpose of the Half Self
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. To verify whether the Drum is rotating: Note 1 Open the Top Cover. 2 Remove the Toner Cartridge. 3 Mark the cartridge’s drive gear with a felt-tipped marker. Note the position of the mark. 4 Install the Toner Cartridge and close the Top Cover.
High-voltage Power Supply Functional Check The High-voltage Power Supply Assembly provides the necessary voltages for the printer’s electrophotographic processes. The +24B VDC supply is used to power the High-voltage Power Supply Assembly. A summary of the major components of the High-voltage System is given in Table 7-33. Table 7-33.
Interface Troubleshooting This section provides an overview of the printer’s interface requirements. Communications Check Note Communication problems are normally the customer’s responsibility. Time spent attempting to resolve these problems may not be covered by the product’s Hewlett-Packard warranty. Refer the customer to the network administrator for assistance in troubleshooting network problems.
Network statistics I/O card status IP address Novell status Node name Figure 7-10 Sample JetDirect Configuration Page (4000 series printer) 7-78 Troubleshooting
Sample JetDirect Configuration Page (4050 series printer) Troubleshooting the Printing System 7-79
HP JetDirect Configuration ● If the HP EIO JetDirect Card has successfully powered up and completed its internal diagnostics, the I/O CARD READY message appears. If communication is lost, an I/O NOT READY message appears followed by a two-digit error code. See the HP JetDirect Network Interface Configuration Guide for further details and recommended action. ● The “Network Statistics” column indicates that network activity has been occurring.
AUTOEXEC.BAT Standard Configurations Parallel DOS Commands If the previous check did not produce the desired result, ensure that the AUTOEXEC.BAT file contains the following statements for parallel interface communications: MODE LPT1: , , P For MS-DOS version 4.0 and above: MODE LPT1: , , B Note This example assumes that you are using parallel printer port LPT1. If you are using LPT2 or LPT3, replace LPT1 in the example with the appropriate printer port.
Communications Checks Table 7-34. Communications Checks Checks Action Is your computer configured These parameters are required to communicate with the printer. to the parameters described Verify that the configuration of the computer's communications in the configuration port matches these parameters. instructions? Note: If these parameters are not set properly, an error may display on the Control Panel.
Table 7-34. Communications Checks (continued) Checks Action If using a bidirectional parallel cable, is it longer than 10 feet (3 meters) long? The maximum recommended cable length for the printer is 10 feet (3 meters). Use a serial interface connection or move the printer closer to the host. Do all the current Control Panel Configuration Menu items match the host system's parameters? Make appropriate changes.
Reference Diagrams Locations of Components Figure 7-11 Components of the Paper Pickup and Feed System (HP LaserJet 4000/4000 N and 4050/4050 N) 7-84 Troubleshooting
Table 7-35.
Figure 7-12 Components of the Paper Feed System (HP LaserJet 4000/4000 N and 4050/4050 N with Optional 500-sheet Universal Tray Assembly) 7-86 Troubleshooting
Figure 7-13 Components of the Duplexer Reference Diagrams 7-87
Figure 7-14 Components of the Fusing and Delivery Unit 7-88 Troubleshooting
Figure 7-15 Components of the Envelope Feeder Reference Diagrams 7-89
Paper Path Figure 7-16 Paper Path (HP LaserJet 4000 T/4000 TN and 4050 T/4050 TN Shown) Figure 7-17 Paper Path with the Duplexer 7-90 Troubleshooting
Figure 7-18 Paper Path with the Envelope Feeder Reference Diagrams 7-91
Figure 7-19 Paper Sensors and the Paper Path Table 7-36. Paper Sensors in Figure 7-19 PS102 Pre-Feed Sensor Sensor and flag located on Registration/Feed Sensor Assembly. PS103 Top of Page Sensor Sensor and flag located on Registration/Feed Sensor Assembly. PS106 Fuser Paper Delivery Sensor 2 Sensor and flag located on Fuser Assembly. PS501 Fuser Paper Delivery Sensor 1 Sensor located on Engine Controller flags on Engine Controller Board and Fusing Assembly.
Engine Controller Board Figure 7-20 Engine Controller Board Layout Table 7-37.
Paper Size Detection Switches Figure 7-21 Paper Size Detection Switches (1 of 3), Tray 2 (HP LaserJet 4000/4000 N and 4050/4050 N) Figure 7-22 Tray 2 Switches Top Tray 3 Switches Paper Size Detection Switches (2 of 3), Trays 2 and 3 (HP LaserJet 4000 T/4000 TN and 4050 T/4050 TN) 7-94 Troubleshooting
Figure 7-23 Paper Size Detection Switches (3 of 3), Optional 500-sheet Universal Tray Assembly Table 7-38.
Motors Figure 7-24 Location of Motors Table 7-39.
Connectors Figure 7-25 Connectors (1 of 3) Reference Diagrams 7-97
Figure 7-26 Connectors (2 of 3) 7-98 Troubleshooting
Figure 7-27 Connectors (3 of 3) For locations of connectors see the wiring diagrams at the back of this manual.
PCAs Figure 7-28 Location of PCAs 7-100 Troubleshooting
Table 7-40. Location of PCAs 1 Engine Controller Board Sequence control, High-voltage output, DC output, and Heater Drive. 2 Paper Size Detection PCA Relay between Sensors/Solenoids and Engine Controller Board, and Paper Size Detection. 3 Paper Feeder Driver PCA Control and detection of solenoids in the Paper Feeder. 4 Envelope Feeder Driver PCA Control and detection of solenoids in the Envelope Feeder. 5 Duplexer Driver PCA Controls paper in the Duplexer.
Sensors and Thermistor Figure 7-29 Location of Sensors and Thermistor (1 of 2) 7-102 Troubleshooting
Figure 7-30 Location of Sensors and Thermistor (2 of 2) Table 7-41.
Table 7-41.
Solenoids and Clutch Figure 7-31 Location of Solenoids and Clutch (1 of 2) Reference Diagrams 7-105
Figure 7-32 Location of Solenoids and Clutch (2 of 2) 7-106 Troubleshooting
Table 7-42.
Switches Figure 7-33 Location of Switches 7-108 Troubleshooting
Table 7-43.
Timing Figure 7-34 Pickup Timing for Tray 2 (and lower trays) Figure 7-35 Pickup Timing for Tray 1 7-110 Troubleshooting
8 Parts and Diagrams Overview This chapter discusses the following: ● How To Use the Parts Lists and Diagrams ● Accessories and Supplies ● Illustrations and Parts Lists Overview 8-1
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 accompanies each exploded view diagram. Each table lists the item number for the replaceable part, the associated part number for the item, the quantity, and a description of the part.
Note Parts that have no item number or part number listed are not field replacement parts and cannot be ordered.
Accessories and Supplies The following items are available through your local authorized HP dealer. To find a dealer near you, call the HP Customer Information Center (800) 752-0900. Note See page 2-4 for documentation product numbers. Table 8-1. Accessories and Supplies Description Part No. Exchange No. 500-Sheet Paper Feeder and Tray Product No.
Table 8-1. Accessories and Supplies (continued) Description Part No. Exchange No. Font DIMM (8 MB Asian MROM) Traditional Chinese Simplified Chinese Euro FIR Receiver (4050 only) Product No.
Common Screws and Replacement Cables Table 8-2. Screws Used in the Printer Description Part No.
Table 8-3. Replaceable Cables Description Part No. Table No. Item No.
Illustrations and Parts Lists Laser Scanner Assembly Top Cover Assembly Tray 1 Pickup Assembly Paper Delivery Assembly Fusing Assembly Tray 1 Assembly Delivery Drive Assembly Paper Feed Guide Assembly Formatter Assembly Printer Drive Assembly Registration Assembly Engine Controller Board Assembly Figure 8-1 Assembly Location Diagram 8-8 Parts and Diagrams Paper Feed Assembly
Table 8-4. Assemblies (Listed Alphabetically) and Their Part Numbers Description Part No. Exchange No.
1 2 9 8 3 4 6 7 5 Figure 8-2 External Covers and Panels 8-10 Parts and Diagrams
Table 8-5. External Covers and Panels Item No. Part No.
5 4 1 3 2 Figure 8-3 Top Cover Assembly 8-12 Parts and Diagrams
Table 8-6. Top Cover Assembly Item No. Part No.
1 16 18 4 2 19 3 5 6 7 8 9 10 14 11 12 15 20 21 22 17 13 Figure 8-4 Internal Components (1 of 3) 8-14 Parts and Diagrams
Table 8-7. Internal Components (1 of 3) Item No. Part No.
23 21 20 1 19 18 17 2 3 16 15 4 5 6 13 14 12 11 10 9 8 22 Figure 8-5 Internal Components (2 of 3) 8-16 Parts and Diagrams 7
Table 8-8. Internal Components (2 of 3) Item No. Part No.
Table 8-8. Internal Components (2 of 3) (continued) Item No. Part No.
Notes: Illustrations and Parts Lists 8-19
1 5 2 4 3 Figure 8-6 Internal Components (3 of 3) 8-20 Parts and Diagrams
Table 8-9. Internal Components (3 of 3) Item No. Part No.
1 Figure 8-7 Engine Controller Board Assembly 8-22 Parts and Diagrams
Table 8-10. Engine Controller Board Assembly Item No. Part No. Exchange No.
2 Figure 8-8 1 Delivery Drive Assembly Table 8-11. Delivery Drive Assembly Item No. Part No.
1 2 3 Figure 8-9 Printer Drive Assembly Table 8-12. Printer Drive Assembly Item No. Part No.
1 7 2 6 3 5 Figure 8-10 Tray 1 Pickup Assembly 8-26 Parts and Diagrams 4
Table 8-13. Tray 1 Pickup Assembly Item No. Part No.
1 Figure 8-11 Tray 1 Assembly Table 8-14. Tray 1 Assembly Item No. Part No.
1 Figure 8-12 Paper Feed Assembly Table 8-15. Paper Feed Assembly Item No. Part No.
1 Figure 8-13 Registration Assembly Table 8-16. Registration Assembly Item No. Part No.
1 4 2 3 Figure 8-14 Paper Feed Guide Assembly Table 8-17. Paper Feed Guide Assembly Item No. Part No.
1 2 3 4 Figure 8-15 Delivery Assembly 8-32 Parts and Diagrams
Table 8-18. Delivery Assembly Item No. Part No.
1 2 Figure 8-16 Fuser Assembly (1 of 2) Table 8-19. Fuser Assembly (1 of 2) Item No. Part No. Exchange No.
1 2 3 Figure 8-17 Fuser Assembly (2 of 2) Table 8-20. Fuser Assembly (2 of 2) Item No. Part No. Exchange No.
13 1 2 4 3 5 12 6 14 7 8 10 11 9 Figure 8-18 Internal Components of 500-Sheet Feeder 8-36 Parts and Diagrams
Table 8-21. Internal Components of 500-sheet Feeder Item No. Part No.
1 8 2 3 6 5 7 Figure 8-19 Paper Pickup Drive Assembly 8-38 Parts and Diagrams 4
Table 8-22. Paper Pickup Drive Assembly Item No. Part No.
7 12 1 11 3 4 5 2 6 9 8 10 Figure 8-20 500-sheet Tray 8-40 Parts and Diagrams
Table 8-23. 500-sheet Tray Item No. Part No.
1 12 11 13 3 2 4 5 3 10 6 8 7 6 9 Figure 8-21 Internal Components of 250-sheet Module (1 of 2) 8-42 Parts and Diagrams
Table 8-24. Internal Components of 250-sheet Module (1 of 2) Item No. Part No.
6 7 4 5A 1 5B 3 8 2 Figure 8-22 Internal Components of 250-sheet Feeder (2 of 2) 8-44 Parts and Diagrams
Table 8-25. Internal Components of 250-sheet Feeder (2 of 2) Item No. Part No.
1 2 Figure 8-23 Upper Paper Pickup Drive Assembly Table 8-26. Upper Paper Pickup Drive Assembly Item No. Part No.
2 1 Figure 8-24 Lower Paper Pickup Drive Assembly Table 8-27. Lower Paper Pickup Drive Assembly Item No. Part No.
6 5 1 4 3 2 Figure 8-25 250-sheet Tray 8-48 Parts and Diagrams
Table 8-28. 250-sheet Tray Item No. Part No.
13 11 13 1 11 2 3 4 10 5 6 9 12 7 8 Figure 8-26 Internal Components of Optional 500-sheet Universal Tray Assembly 8-50 Parts and Diagrams
Table 8-29. Internal Components of Optional 500-sheet Universal Tray Assembly Item No. Part No.
2 3 4 8 7 1 5 Figure 8-27 Optional 500-sheet Universal Tray Assembly 8-52 Parts and Diagrams 6
Table 8-30. Optional 500-sheet Universal Tray Assembly Item No. Part No.
4 3 2 1 Figure 8-28 Envelope Feeder 8-54 Parts and Diagrams
Table 8-31. Envelope Feeder Item No. Part No. Exchange No.
1 2 6 3 5 4 Figure 8-29 Internal Components of Duplexer 8-56 Parts and Diagrams
Table 8-32. Internal Components of Duplexer Item No. Part No. Exchange No.
Alphabetical Parts List Table 8-33.
Table 8-33.
Table 8-33.
Table 8-33.
Table 8-33.
Table 8-33.
Table 8-33.
Table 8-33.
Table 8-33.
Numerical Parts List Table 8-34.
Table 8-34.
Table 8-34.
Table 8-34.
Table 8-34.
Table 8-34.
Table 8-34.
Table 8-34.
Index Numerics 250-sheet tray, paper specifications 1-13 500-sheet tray, paper specifications 1-12 A AC/DC power distribution 5-2 accessories 8-4 assemblies Delivery 8-32 Delivery Drive 6-41, 8-24 Engine Controller Board 8-22 Fan 6-24 Formatter Cage 6-20 Fuser 6-18, 8-34 Gear Train 6-40 Laser Scanner 6-23 locations of 8-8 Main Motor 6-25 Output 6-21 Paper Feed 6-36, 8-29 Paper Feed Guide 8-31 Paper Pickup Drive 8-38 Paper Pickup Drive, lower 8-47 Paper Pickup Drive, upper 8-46 Printer Drive 8-25 Registrati
Engine Controller Board Assembly 8-22 removing and replacing 6-44 engine controller subsystem 5-6 Engine Module 6-42 engine test 7-11 Envelope Feeder 5-44 envelopes 1-20 environmental product stewardship 1-28 error messages 7-17 Event Log 7-13 F Fan, removing and replacing 6-24 500-sheet tray, paper specifications 1-12 Formatter Cage Assembly, removing and replacing 6-20 Formatter Pan, removing and replacing 6-39 Formatter system 5-15 Front Right Side Cover, removing and replacing 6-13 Fuser Assembly 8-34
Paper Pickup Drive Assembly 8-38 Paper Pickup Drive assembly lower 8-47 upper 8-46 paper specifications card stock 1-23 envelopes 1-20 guidelines for using paper 1-16 heavy paper 1-23 labels 1-19 supported types 1-15 transparencies 1-19 weight equivalence 1-18 parts 2-3 parts lists alphabetical 8-58 how to use 8-2 numerical 8-67 PCA Controller, removing and replacing 6-56 PCA Cover, removing and replacing HP LaserJet 4000 T/4000 TN 6-54 HP LaserJet 4000/4000 N 6-55 PCAs 7-100 Phillips screwdriver 6-3 photos
T V testing, engine 7-11 thermistor 7-102 timing diagrams 7-110 toner cleaning spilled 4-4 consumption 1-28 toner cartridge 2-9, 5-22, 5-24 detection 5-5 recycling 2-9 refilled 2-9 Toner Cartridge Drive Arm, removing and replacing 6-9 tools 6-3 Top Cover Assembly 8-12 removing and replacing 6-7 top margin adjustment 6-46 training media 2-4 Transfer Roller, removing and replacing 6-26 transparencies 1-19 Tray 1 Assembly 8-28 paper sensor 5-36 Pickup Assembly 8-26 printing from 5-36 removing and replacing 6
6 5 J715 Duplex pickup Duplexing unit paper sensor solenoid PS701 SL701 Duplex feed motor Reversing motor M702 M701 4 J716 J717 PS703 Reversed paper sensor J713 J702 J701 J706 J703 J133 PS702 Rear Output Bin sensor PS 106 Fuser paper delivery sensor 2 J714 J705 3 J704 J134 J137 FM701 J719 Laser/scanner unit D Scanning motor FG J135 J132 J707 J718 J711 Duplexing unit exhaust fan J712 BD PCA Laser driver J551 J401 J501 J131 Duplexing unit J114 J102 J154 J58 J103 J31 J
6 5 J715 Duplex pickup Duplexing unit paper sensor solenoid PS701 SL701 Duplex feed motor Reversing motor M702 M701 4 J716 J717 PS703 Reversed paper sensor J713 J702 J701 J706 J703 J133 PS702 Rear Output Bin sensor PS 106 Fuser paper delivery sensor 2 J714 J705 3 J704 J134 J137 FM701 J719 J718 Laser/scanner unit D Scanning motor FG J135 J132 J707 J711 Duplexing unit exhaust fan J712 BD PCA Laser driver J551 J401 J501 J131 Duplexing unit J114 J102 J154 J58 J103 J31 J7
Manual Part No. C4251-91003 Printed on at least 50% Total Recycled Fiber with at least 10% Post-Consumer Paper *C4251-91003* *C4251-91003* C4251-91003 HP LaserJet 4000 and 4050 Series Printers Service Manual Copyright© 1999 Hewlett-Packard Co.
