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HP LaserJet 4000 Service Manual

Laserjet 4000 series; laserjet 4050 series.
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HP LaserJet 4000 and
4050 Series Printers
Service Manual

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Chapters

Troubleshooting

   Related Manuals for HP LaserJet 4000

   Summary of Contents for HP LaserJet 4000

  • Page 1

    HP LaserJet 4000 and 4050 Series Printers Service Manual...

  • Page 3

    HP LaserJet 4000 and 4050 Series Printers Service Manual _____________...

  • Page 4

    © Copyright Hewlett-Packard Warranty Trademark Credits Company 1999 The information contained in PostScript ™ is a trademark of All Rights Reserved. this document is subject to Adobe Systems Incorporated Reproduction, adaptation, or change without notice. which may be registered in translation without prior written certain jurisdictions.

  • Page 5: Table Of Contents

    HP FIRST ........

  • Page 6: Table Of Contents

    3 Printer Operation Overview ..........3-1 Using the Control Panel .

  • Page 7: Table Of Contents

    5 Functional Information Overview ..........5-1 Power Supply System .

  • Page 8: Table Of Contents

    4050 T/4050 TN)....... . . 6-54 PCA Cover (HP LaserJet 4000/4000 N and 4050/4050 N) . . 6-55 PCA Controller .

  • Page 9: Table Of Contents

    7 Troubleshooting Overview ..........7-1 Troubleshooting Process .

  • Page 10

    Contents-6...

  • Page 11: Overview

    Printer Description Overview This chapter discusses the following: Printer Features Identification Site Requirements Paper Specifications Safety Information Overview 1-1...

  • Page 12: Printer Features

    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. Resolution 300 dpi with PCL5e/HP’s PostScript Level 2 emulation (PS) 600 dpi with PCL5e/PS...

  • Page 13

    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)

  • Page 14

    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. “RIP ONCE” capability with 16 MB or hard disk option Resolution 300 dpi with PCL5e/HP’s PostScript...

  • Page 15

    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)

  • Page 16

    Table 1-3. Comparison of HP LaserJet 4000 Series Printers HP LaserJet HP LaserJet HP LaserJet HP LaserJet 4000 4000 T 4000 N 4000 TN Ethernet 10-T/ 10-2 optional optional standard standard LocalTalk Max. # Input Bins Standard RAM 4 MB internal...

  • Page 17

    Table 1-4. Comparison of HP LaserJet 4050 Series Printers HP LaserJet HP LaserJet HP LaserJet HP LaserJet 4050 4050 T 4050 N 4050 TN Ethernet 10-T/ 10-2 optional optional optional optional LocalTalk 10/100 Base TX optional optional standard standard Max. # Input Bins...

  • Page 18: Identification, Model And Serial Numbers

    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.

  • Page 19: Site Requirements

    Install with enough space around the printer for proper access and ventilation. Install away from the direct flow of exhaust from air ventilation systems. Table 1-5. Electrical Specifications for the HP LaserJet 4000 and 4050 Series Printers Volts Frequency Amperes Watts (typical) 100-127 VAC±10%...

  • Page 20: Space Requirements

    Figure 1-2 Printer Dimensions Printer Weight (without Toner Cartridge) HP LaserJet 4000/4000 N and 4050/4050 N printers: 39.27 lb (17.85 kg) HP LaserJet 4000 T/4000 TN and 4050 T/4050 TN printers: 45.66 lb (20.71 kg) 1-10 Printer Description...

  • Page 21: Environmental Requirements

    Environmental Requirements Table 1-6. Printer and Toner Cartridge Environmental Conditions Item Operating Storage ° ° Temperature 50-91 F (10-32 32 to 95° F (0 to 35°C) Relative Humidity 20-80% RH (with no 10% to 95% RH condensation) Table 1-7. Acoustic Emissions (Per ISO 9296) Printer State Sound Power Printing, 17 pages per minute...

  • Page 22: Paper Specifications

    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 Dimensions* Weight Capacity** Paper Minimum Size 3 by 5 in*** (custom) (76 by 127 mm) 16 to 53 lb...

  • Page 23

    Table 1-10. Paper Specifications, Trays 2 and 3 (HP LaserJet 4000 T/4000 TN and 4050 T/4050 TN) Supported Dimensions* Weight Capacity** Paper Letter 8.5 by 11 in (216 by 279 mm) 8.3 by 11.7 in (210 by 297 mm) Executive 7.3 by 10.5 in...

  • Page 24

    Table 1-11. Paper Specifications, Optional 500-Sheet Universal Tray Supported Dimensions* Weight Capacity** Paper Letter 8.5 by 11 in (216 by 279 mm) 8.3 by 11.7 in (210 by 297 mm) Executive 7.3 by 10.5 in (191 by 267 mm) Executive JIS 8.5 by 13 in (custom ***) (216 by 330 mm)

  • Page 25: Supported Types Of Paper

    Table 1-12. Paper Specifications, Optional Envelope Feeder Supported Dimensions* Weight Capacity** Paper Minimum Size 3.5 by 6.3 in (90 by 160 mm) 20 to 28 lb 75 envelopes (75 to 105 g/m Maximum Size 7 by 10 in (178 by 254 mm) The printer supports a wide range of paper sizes.

  • Page 26: Guidelines For Using Paper

    Guidelines for Using Paper For best results, use conventional 20 lb (75 g/m ) 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.

  • Page 27

    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°...

  • Page 28: Paper Weight Equivalence Table

    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).

  • Page 29: Labels

    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°...

  • Page 30: Envelopes

    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/m ), or jamming may result.

  • Page 31: Envelopes With Double Side Seams

    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.

  • Page 32: Envelope Margins, Envelope Storage

    Envelope Margins The following table gives typical address margins for a Commercial #10 or DL envelope. Table 1-16. Envelope Margins 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) Note For the best print quality, position margins no closer than 0.6 in (15 mm)

  • Page 33: Card Stock And Heavy Paper

    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.

  • Page 34: Safety Information

    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”...

  • Page 35: Fcc Regulations

    Consult your dealer or an experienced radio/TV technician. Note Any changes or modifications to the printer that are not expressly approved by HP could void the user’s authority to operate this equipment. Use of a shielded interface cable is required to comply with the Class B limits of Part 15 of FCC rules.

  • Page 36: Laser Statement For Finland

    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.

  • Page 37: Toner Safety

    (800) 231-9300. Use index number 7 for a listing of the Toner Cartridge/Drum Material/Chemical Safety Data Sheets. Note To get documents from HP FIRST by fax, you must use a Group 3 fax machine. Safety Information 1-27...

  • Page 38: Environmental Product Stewardship

    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 The printer uses charging rollers in the electrophotographic process and Production therefore generates no appreciable ozone gas (0 CFC Usage...

  • Page 39

    Service Approach Overview This chapter discusses the following: Service Approach Parts and Supplies Warranty Statement Overview 2-1...

  • Page 40: Service Approach

    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).

  • Page 41: Parts And Supplies

    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).

  • Page 42: Helpful Documentation

    5081-9469 CD-ROM printer hardware User’s Documentation Bundle, An additional copy of the user’s C4118-99051 HP LaserJet 4000 and 4000 N guide, the getting started guide, (English) Printers and the quick reference guide. User’s Documentation Bundle, An additional copy of the user’s...

  • Page 43

    An interactive training CD-ROM C4251-60106 for the for printer service HP LaserJet 4050 Printers representatives and customer care specialists. HP LaserJet 4000 and 4050 A combined service manual for C4251-91003 Series Printers Service Manual both series of printers. Parts and Supplies 2-5...

  • Page 44: Phone Numbers For Ordering, Exchange Program

    This powerful, CD-ROM-based parts information tool is designed to give users fast, easy access to parts information such as pricing and recommended stocking lists for a wide range of HP products. To subscribe to this quarterly service in the U.S. or Canada, call (800) 336-5987.

  • Page 45: Hp Support Assistant Compact Disc

    HP FIRST HP FIRST fax-on-demand service will deliver detailed troubleshooting information on common software and troubleshooting tips for your HP product. Call from any touch tone phone and request up to three documents per call. These documents will be sent to the fax of your choice.

  • Page 46: Customer Care Reseller Sales And Service Support Center

    You can reach this support center at 1-800-544-9976. Other Areas Outside of North America and Europe, contact your local HP sales office for assistance in obtaining technical support for resellers and service technicians.

  • Page 47: Toner Cartridge Information

    Plastics and other materials are recycled. HP pays the shipping costs from the user to the recycling plant. For each cartridge returned, HP donates one U.S. dollar to be shared by the Nature Conservancy and the National Wildlife Federation. To join this recycling effort, follow the instructions inside the Toner Cartridge’s...

  • Page 48: Warranty Statement

    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. 2-10 Service Approach...

  • Page 49

    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...

  • Page 50: Using The Control Panel

    Using the Control Panel Control Panel Layout The printer’s Control Panel consists of the following: READY 2-line display Menu Ready Item Data 4050 only – Value + Attention Cancel Select Figure 3-1 Control Panel Layout Control Panel Lights Table 3-1. Control Panel Lights Light Indication Ready...

  • Page 51: Control Panel Keys

    Control Panel Keys Table 3-2. Control Panel Keys 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 TRAY X LOAD [TYPE] [SIZE] UNEXPECTED...

  • Page 52: Settings And Defaults

    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.

  • Page 53: Control Panel Menus

    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: Press [Menu] until the desired menu appears. Press [Item] until the desired item appears.

  • Page 54: Quick Copy Jobs Menu

    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.

  • Page 55: Private/stored Jobs Menu

    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.

  • Page 56: Information Menu

    Control Panel menu items. PRINT The Configuration Page shows the printer’s current configuration. CONFIGURATION If an HP JetDirect print server card is installed (HP LaserJet 4000 N/4000 TN and 4050 N/4050 TN printers), a JetDirect Configuration Page will print out as well. PRINT...

  • Page 57: Paper Handling Menu

    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).

  • Page 58

    This item appears only when a fourth PLAIN see page 1-12. paper tray is installed (available only on the HP LaserJet 4000 T/4000 TN and 4050 T/4050 TN printers). Set the value to correspond with the paper type currently loaded in Tray 4.

  • Page 59

    Table 3-7. Paper Handling Menu (continued) Item Values Explanation OVERRIDE A4/ Choose to print on letter size LETTER=NO 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).

  • Page 60: Print Quality Menu

    PRORES 1200 : Produces optimum print quality (true 1200 dpi) at half the printer’s maximum speed (8 ppm for the HP LaserJet 4000 printer, or at highest print quality at engine speed for the HP LaserJet 4050 printer). When the resolution is changed,...

  • Page 61

    Toner on the printed page by up to 50%. Caution HP does not recommend full-time use of EconoMode. (If EconoMode is used full-time, it is possible that the Toner supply will outlast the mechanical parts in the Toner cartridge.)

  • Page 62

    Table 3-8. Print Quality Menu (continued) Item Values Explanation TONER DENSITY=3 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.

  • Page 63: Printing Menu

    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...

  • Page 64

    Table 3-9. Printing Menu (continued) Item Values Explanation UNIT OF MEASURE= INCHES This item appears only when INCHES CONFIGURE CUSTOM MILLIMETERS PAPER=YES (110V printers) . Select the unit of measurement for the custom MILLIMETERS paper size. (220V printers) X DIMENSION= 3.00 TO 8.5 INCHES This item appears only when 8.5 INCHES...

  • Page 65

    Table 3-9. Printing Menu (continued) Item Values Explanation INTERNAL PCL FONT INTERNAL : Internal fonts. SOFT SOURCE=INTERNAL SOFT : Permanent soft fonts. SLOT 1 SLOT 1, 2, OR 3 , or : Fonts stored in one of the three DIMM slots. Note It is best to set the font source from the printer driver or...

  • Page 66

    : The internal Courier font available on the HP LaserJet 4 series printers. DARK : The internal Courier font available on the HP LaserJet III series printers. Both fonts are not available at the same time. WIDE A4=NO The Wide A4 setting changes...

  • Page 67

    Table 3-9. Printing Menu (continued) Item Values Explanation APPEND CR TO LF= Select 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.

  • Page 68: Configuration Menu

    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= Set the printer to enter PowerSave after it 30 MINUTES 15 MINUTES has been idle for a specified amount of time. 30 MINUTES Turning PowerSave off is not recommended.

  • Page 69

    Table 3-10. Configuration Menu (continued) Item Values Explanation RESOURCE SAVE= Dedicate printer memory to save each language’s permanent resources. (You AUTO 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.

  • Page 70

    Table 3-10. Configuration Menu (continued) Item Values Explanation 21 PAGE PAGE PROTECT= AUTO This item appears only after a TOO COMPLEX, PRESS GO TO AUTO CONTINUE message displays. Memory Enhancement technology (MEt) attempts to guarantee that all pages will PAGE print.

  • Page 71

    Table 3-10. Configuration Menu (continued) Item Values Explanation TONER CONTINUE Determine how the printer behaves when TONER LOW LOW=CONTINUE STOP Toner is low. The 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...

  • Page 72

    Table 3-10. Configuration Menu (continued) Item Values Explanation JAM RECOVERY= AUTO Determine how the printer behaves when a AUTO paper jam occurs. AUTO : The printer automatically selects the best mode for printer jam recovery (usually AUTO ). This is the default setting. : The printer automatically reprints pages after a paper jam is cleared.

  • Page 73

    Explanation QUICK COPY Specifies the number of quick copy jobs that JOBS = 32 can be stored on the printer’s hard disk. (HP LaserJet 4050 series printer with hard disk installed only) HELD JOB 1 HOUR This setting allows the user to set the...

  • Page 74: I/o Menu

    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 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.

  • Page 75

    Table 3-11. I/O Menu (continued) Item Values Explanation PARALLEL HIGH Select the speed at which data is transmitted to SPEED=YES the printer. : The printer accepts faster parallel communications used for connections with newer computers. : The printer accepts slower parallel communications used for connections with older computers.

  • Page 76

    Table 3-11. I/O Menu (continued) Item Values Explanation SERIAL SERIAL ROBUST This item appears only when PACING=XON/XOFF XON=ON . Select the method for generating XONs. : The printer sends an XON when the printer is online and when sufficient buffer space is available.

  • Page 77: Eio Menu (networked Printers), 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.

  • Page 78

    Also, you can manually set the Timeout time period. Note If no IP address is assigned within the first 5 minutes, the HP JetDirect print server card will assume a default IP address of 192.0.0.192. CFG ETALK=NO : The EtherTalk Menu is not accessible.

  • Page 79: Resets Menu

    [Cancel Job] clears only the current job. Note Job retention features will be deleted if you do not have the hard disk accessory. (HP LaserJet 4050 series printer only.) Table 3-13. Resets Menu Item Explanation RESET MEMORY This item clears the printer buffer and the active I/O input buffer, and makes the Control Panel defaults current.

  • Page 80: Service Mode

    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).

  • Page 81: Service Menu

    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.

  • Page 82: 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.

  • Page 83: Maintenance Page Count

    Table 3-14. Changing the Page Count (continued) Key Press Display Description PAGES=0 0000 [Select] Advance the cursor one digit to the right. PAGES=00 0000 * [Value +] Increase the value of the third digit by one. PAGES=0 000 * [Select] Enter the change to the third digit and advance the cursor one digit to the right.

  • Page 84: Cold Reset Paper, Serial Number

    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 PAGES 400,114 pages.) Editing this number is similar to editing the...

  • Page 85: Testing The Printer

    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.

  • Page 86: Resetting The Printer

    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.

  • Page 87: System Configuration, Ms-dos System Configuration

    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.

  • Page 88: Serial Ms-dos Commands

    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:...

  • Page 89: Printer I/o Configuration, Parallel Menu, Serial Configuration

    The default setting . This default setting ( ) must be active in order to use ® HP LaserJet Explorer, the Windows Printing System, and other software applications and drivers. Serial Configuration Use RS-232C serial configuration when the printer is located 11 to 50 feet (3.35 to 15.24 meters) from the computer.

  • Page 90

    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.

  • Page 91

    Printer Maintenance Overview This chapter discusses the following: Cleaning the Printer and Accessories Preventative Maintenance Overview 4-1...

  • Page 92: Cleaning The Printer And Accessories

    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.

  • Page 93

    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.

  • Page 94: Cleaning Spilled Toner

    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: PRINT QUALITY MENU Press [Menu] until appears. CREATE CLEANING PAGE Press [Item] until...

  • Page 95: Preventative Maintenance, Reset Maintenance Count

    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.

  • Page 96: Expected Life Of Components

    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 Part name Part No.

  • Page 97

    Functional Information Overview This chapter presents a generalized functional overview of the printer and the printing processes. This chapter discusses the following printer systems: Power Supply System Engine Controller System Formatter System Image Formation System Paper Feed System Basic Sequence of Operation Overview 5-1...

  • Page 98: Power Supply System, Ac/dc Power Distribution

    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.

  • Page 99: Overcurrent Overvoltage Protection

    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°...

  • Page 100: High-voltage Power Distribution

    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.

  • Page 101: Toner Cartridge Detection

    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.

  • Page 102: Engine Controller System

    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...

  • Page 103

    Figure 5-3 Engine Controller Board Engine Controller System 5-7...

  • Page 104: Engine Controller Board Inputs And Outputs

    Engine Controller Board Inputs and Outputs Figure 5-4 Engine Controller Board I/O (1 of 4) 5-8 Functional Information...

  • Page 105

    Figure 5-5 Engine Controller Board I/O (2 of 4) Engine Controller System 5-9...

  • Page 106

    Figure 5-6 Engine Controller Board I/O (3 of 4) 5-10 Functional Information...

  • Page 107

    Figure 5-7 Engine Controller Board I/O (4 of 4) Engine Controller System 5-11...

  • Page 108: Laser And Scanner Drive, Paper Motion Monitoring And Control, Solenoids, Sensors, Clutches, And Switches

    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.

  • Page 109: Motors

    The CPU (IC501) sets the Main Motor Drive signal (/MON) to “L” and rotates the Main Motor. When the HP LaserJet 4000 series printer is printing at 1200 dpi, the CPU sets the main motor rotation switching signal (/HALF) to “L” and decreases the rotation speed of the Main Motor to half.

  • Page 110

    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.

  • Page 111: Formatter System

    The Formatter PCA also provides the electrical interface and mounting locations for two EIO cards, additional memory DIMMs, and the Hard Disk accessory, and the HP Fast InfraRed Receiver (HP LaserJet 4050 series printer only). PowerSave This feature (accessed from the Configuration Menu) conserves power by shutting down the Fuser and Exhaust Fans after the printer has been idle for an adjustable period of time.

  • Page 112: Resolution Enhancement Technology (ret), Resolution Enhancement Technology (ret)

    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”...

  • Page 113: Input/output

    Formatter PCA. It provides automatic I/O switching between multiple computers or networks connected to the printer. The network versions for the HP LaserJet 4000 series printers include LocalTalk and the HP JetDirect Multi-protocol Network Card with Ethernet/10Base-T and 10Base-2. The network versions for the HP LaserJet 4050 series printers include the HP JetDirect Print Server with 10/100 Base TX.

  • Page 114: Printer Memory

    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. The LocalTalk hardware is bundled with the HP LaserJet 4000 N/TN printers.

  • Page 115: Random Access Memory (ram), Random Access Memory (ram), Dimm Slots

    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”...

  • Page 116: Page Protect, Pjl Overview

    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).

  • Page 117: Control Panel

    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”...

  • Page 118: Image Formation System

    Image Formation System The image formation system is the main system in the printer. It consists of six stages: 1. Cleaning 4. Developing 2. Conditioning 5. Transferring 3. Writing 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.

  • Page 119

    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. Image Formation System 5-23...

  • Page 120: Toner Cartridge

    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.

  • Page 121: Photosensitive Drum

    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.

  • Page 122: Cleaning The Drum

    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. Figure 5-12 Cleaning the Drum 5-26 Functional Information...

  • Page 123

    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.

  • Page 124: Writing The Image

    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.

  • Page 125: Developing The Image

    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.

  • Page 126: Transferring The Image

    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.

  • Page 127: Image Fusing/variable Fusing Temperature

    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.

  • Page 128

    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.

  • Page 129: Paper Feed System

    Paper Feed System Figure 5-19 Paper Feed Subsystem Paper Feed System 5-33...

  • Page 130

    Both the size of the paper in the tray and the presence of a tray are detected by the three switches (SW600, 601, 602) on the Paper Size Detection PCA for the HP LaserJet 4000, 4000 N, 4050, and 4050 N, 5-34 Functional Information...

  • Page 131: Clutches And Sensors

    (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.

  • Page 132: Printing From Tray 1

    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.

  • Page 133

    Figure 5-22 Tray 1 Pickup Paper Feed System 5-37...

  • Page 134: Printing From Tray 2

    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...

  • Page 135

    Figure 5-24 Tray 2 Pickup Paper Feed System 5-39...

  • Page 136

    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.

  • Page 137: Universal Tray

    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.

  • Page 138

    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.

  • Page 139

    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.

  • Page 140: Envelope Feeder

    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.

  • Page 141

    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.

  • Page 142: Duplexer

    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.

  • Page 143

    Figure 5-31 Paper Path for the Duplexer Paper Feed System 5-47...

  • Page 144: Paper Jam

    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.

  • Page 145: Basic Sequence Of Operation

    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.

  • Page 146

    Figure 5-33 Timing Diagram 5-50 Functional Information...

  • Page 147

    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...

  • Page 148: Removal And Replacement Strategy

    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.

  • Page 149: Tools

    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.

  • Page 150

    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.

  • Page 151

    Table 6-1. Screws Used in the Printer (continued) Drawing and Description Purpose Used to anchor Tray 1 Pickup Assembly (4.8 in/116 mm) Long screw 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.

  • Page 152: Removing Covers, Rear Right Side Cover

    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.

  • Page 153: Top 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).

  • Page 154

    Control Panel Figure 6-4 Removing the Control Panel Using a flat-blade screwdriver, pry each side of the Control Panel upward. Remove the top of the Control Panel from the tab. Disconnect the ribbon cable from the Control Panel. 6-8 Removing and Replacing Parts...

  • Page 155

    Toner Cartridge Drive Arm Figure 6-5 Removing the Toner Cartridge Drive Arm Remove the Toner Cartridge Drive Arm by using needle-nose pliers to pinch the pin from its hinge on the Top Cover. Note Be sure to reconnect the Toner Cartridge Drive Arm when you replace the Top Cover, or the Toner Cartridge will not seat properly.

  • Page 156

    Toner cartridge drive arm Rear screws Top screws Figure 6-6 Removing the Top Cover 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). 6-10 Removing and Replacing Parts...

  • Page 157

    Release tab if necessary Figure 6-7 Releasing tabs to lift the Top Cover 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. Holding the output assembly in place (located toward the rear of the printer), remove the Top Cover.

  • Page 158: Left Side Cover

    Left Side Cover Catches Latch (inside) Figure 6-8 Removing the Left Side Cover Open Tray 1. Release the latch on the left side cover from the inside of the printer. Release the catches on the front side of the cover. Lift the cover upward to release the front top side of the cover, then pull the cover away from the printer.

  • Page 159: Front Right Side Cover

    Front Right Side Cover Latch Figure 6-9 Removing the Front Right Side Cover Release the latch at the top center of the cover. 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. Hint When you reinstall the Front Right Side Cover, be sure to reconnect the power switch rod.

  • Page 160: Rear Cover/rear Output Bin

    Rear Cover/Rear Output Bin Step 2 Step 1 Figure 6-10 Removing the Rear Cover/Rear Output Bin Facing the rear of the printer, pinch the right side of the Rear Output Bin and release the hinge from the slot. Rotate the bin upward and slide it to the right to release the left hinge.

  • Page 161

    Tray 1 Figure 6-11 Removing Tray 1 from the Front Cover Open Tray 1. Push outward on the two slot hinges to release the pins on Tray 1. Slide the Front Cover to the right and remove it from the three hinges on the bottom.

  • Page 162

    Figure 6-12 Removing the Tray 1 Sensor Arm Cover 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. Rotate Tray 1 downward and remove it from the two hinges.

  • Page 163

    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 Covers 6-17...

  • Page 164: Removing Assemblies

    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. Remove the Rear Cover/Rear Output Bin (page 6-14). Figure 6-14 Removing the Left and Right Duplex Connector Covers If a Duplexer is installed, remove it.

  • Page 165

    Figure 6-15 Loosening the captive screws in the Fuser Assembly Loosen the two captive screws on the Fuser Assembly. Pull the Fuser Assembly straight out of the printer. Removing Assemblies 6-19...

  • Page 166: Formatter Cage Assembly

    Formatter Cage Assembly For accessing DIMMs accessory Figure 6-16 Removing the Formatter Cage Assembly Print a Configuration Page. The information is necessary to reconfigure the printer after you replace the Formatter. Remove the rear right side cover (page 6-6). The Formatter Cage Assembly is directly underneath.

  • Page 167: Output Assembly

    Output Assembly White tab Brass arm Figure 6-17 Removing the Output Assembly Remove the Top Cover (page 6-7). The Output Assembly is on the top, rear of the printer. Removing Assemblies 6-21...

  • Page 168

    Facing the rear of the printer, release the 2 latches as follows: Figure 6-18 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.

  • Page 169: Laser Scanner

    Laser Scanner Shutter interlock and plate Figure 6-20 Removing the Laser Scanner 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 Unplug the 3 connectors as shown. Remove the 4 black screws around the edges of the Laser Scanner.

  • Page 170

    Figure 6-21 Removing the Fan 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. Unplug the Fan’s connector to the Engine Controller Board. Squeeze the latches on the left and right sides of the Fan cover. Pull the Fan straight out.

  • Page 171: Main Motor

    Main Motor Figure 6-22 Removing the Main Motor 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. Unplug the connector. Remove the 4 silver screws around the corners of the metal plate. Remove the Main Motor from the printer.

  • Page 172: Transfer Roller

    Transfer Roller DO NOT TOUCH! (See Hint) Figure 6-23 Removing the Transfer Roller Open the Top Cover and remove the Toner Cartridge. The Transfer Roller is underneath the Toner Cartridge. CAUTION Do not touch the black rubber part of the roller. Skin oils on the roller can cause problems with print quality.

  • Page 173: Tray 1 Pickup Roller

    Tray 1 Pickup Roller Figure 6-24 Removing the Pickup Roller (shown with Envelope Entrance Cover removed) Open Tray 1. The Tray 1 Pickup Roller is in the center of the Tray 1 Pickup Assembly. Grasp the Envelope Entrance Cover and pull it straight away from the printer.

  • Page 174

    Figure 6-25 Detail of the Tray 1 Pickup Roller 6-28 Removing and Replacing Parts...

  • Page 175: Tray 1 Pickup Assembly

    Tray 1 Pickup Assembly 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 Envelope feeder connector...

  • Page 176

    Figure 6-27 Removing the Tray 1 Pickup Assembly – Right Side Disconnect the solenoid cable on the right side of the Tray 1 Pickup Assembly. (Note the way the cables are routed for replacement.) 6-30 Removing and Replacing Parts...

  • Page 177

    Step 7 Step 8 Step 6 Figure 6-28 Removing the Tray 1 Pickup Assembly – Left Side Unplug the connector to the Engine Controller Board on the left side of the Tray 1 Pickup Assembly. Remove the long screw (4.8 in/116 mm) from the left side of the assembly.

  • Page 178

    Toner cartridge guide Figure 6-29 Removing the Tray 1 Pickup Assembly – Front Side 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.

  • Page 179: Right Side Toner Cartridge Guide

    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.

  • Page 180: Registration Assembly

    Registration Assembly Figure 6-31 Removing the Registration Assembly 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).

  • Page 181

    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. Lift the green handle.

  • Page 182: Paper Feed Assembly

    Paper Feed Assembly 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...

  • Page 183

    Figure 6-34 Removing the upper screws from the Paper Feed Assembly Remove the 2 black upper screws. Hint 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.

  • Page 184

    Hint For replacement of the Paper Feed Assembly, orient the clutch properly by inserting it into the slot, as shown. Figure 6-35 Detail of the Paper Feed Clutch 6-38 Removing and Replacing Parts...

  • Page 185: Formatter Pan

    Formatter Pan Figure 6-36 Removing the Formatter Pan 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.

  • Page 186: Gear Train

    Gear Train Toner Cartridge Drive Arm Step 4 Figure 6-37 Removing the Gear Train 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).

  • Page 187: Delivery Drive Assembly

    Delivery Drive Assembly Figure 6-38 Removing the Delivery Drive Assembly 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).

  • Page 188: Separating The Engine Module From The Paper Feed Module

    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. 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).

  • Page 189

    Figure 6-40 Separating the Engine from the Paper Feed Module Remove the single black, self-tapping screw from the left side of the printer, below the Fan. CAUTION Lift the Engine carefully, being sure that all cables are disconnected. Lift the Engine away from the Paper Feed Module. Separating the Engine Module from the Paper Feed Module 6-43...

  • Page 190: Engine Controller Board

    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. Separate the Engine from the Paper Feed Module (page 6-42). The Engine Controller Board is on the underside of the Engine and contains the following: •...

  • Page 191

    Facing the front of the Engine Module: 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) Disconnect the spring on the right side from the notch.

  • Page 192: Adjusting The Top Margin

    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 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.

  • Page 193

    Measure this distance Figure 6-44 Adjusting the top margin Measure the distance between the edge of the paper and the print pattern. Measure all the test prints and calculate the average. 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.

  • Page 194: Paper Feed Rollers

    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.

  • Page 195: Separation Rollers

    Separation Rollers Figure 6-46 Removing the Separation Rollers The Separation Rollers are inside the paper trays. Release the latch and lift the cover inside the tray. Pinch the release at the left side of the Roller and slide it off the shaft.

  • Page 196: Paper Feed Module Plate

    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 Remove the 7 black self-tapping screws (one of them is recessed in front).

  • Page 197: Paper Feed Module Gear Train Assembly

    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 Remove the long recessed screw shown. Unplug the connector (note routing). Lift the gear train upward, away from the Paper Feed Module. Separating the Engine Module from the Paper Feed Module 6-51...

  • Page 198: Paper Feed Module Side Rails

    Unplug (Long connector screw) Figure 6-49 Removing the Paper Feed Module side rails (HP LaserJet 4000 T/4000 TN and 4050 T/4050 TN shown) To remove the side rails, remove the 4 recessed screws (1 is long). Unplug the connector. Lift the side rails off of the Paper Feed Module.

  • Page 199

    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 Remove 9 black self-tapping screws. Remove 2 small black M3 screws. Lift up the lower Paper Feed Module Plate to remove it.

  • Page 200

    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) Pinch the left and right sides of the PCA Cover to release it from the side latches.

  • Page 201: Pca Cover (hp Laserjet 4000/4000 N And 4050/4050 N)

    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) Release the latches shown. Remove the PCA Cover. Separating the Engine Module from the Paper Feed Module 6-55...

  • Page 202: Pca Controller

    PCA Controller This procedure is the same for one 500-sheet Tray or two 250-sheet Trays. Figure 6-53 Removing the PCA Controller Unplug 3 connectors to the PCA Controller. Unclip the left side of the PCA Controller and remove it. 6-56 Removing and Replacing Parts...

  • Page 203

    Troubleshooting Overview This chapter discusses the following: Troubleshooting Process Troubleshooting the Printing System Reference Diagrams Overview 7-1...

  • Page 204: Troubleshooting Process

    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.

  • Page 205

    Table 7-1. Major Steps for Troubleshooting (continued) General Paper Path Is there a paper jam in the printer? Troubleshooting (page 7-45) This section gives information about solving problems in the paper path. Information Pages Will the printer print information pages successfully? (page 7-48) This section gives the procedures for printing the information pages and evaluating and correcting the printer’s configuration.

  • Page 206: Troubleshooting Flowchart

    Troubleshooting Flowchart Figure 7-1 Troubleshooting Flowchart (1 of 2) 7-4 Troubleshooting...

  • Page 207: Troubleshooting Flowchart (continued), Troubleshooting Flowchart (continued)

    Troubleshooting Flowchart (Continued) Troubleshooting Flowchart, continued Troubleshooting Process 7-5...

  • Page 208: Troubleshooting The Printing System, Preliminary Operating Checks

    The printer is never exposed to ammonia fumes such as those produced by diazo copiers or office cleaning materials. The printer is not exposed to direct sunlight. Non-HP components (such as refilled Toner Cartridges, font cartridges, and memory boards) are removed from the printer. Note...

  • Page 209: Power On

    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...

  • Page 210

    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.

  • Page 211

    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 Insert the power plug firmly.

  • Page 212

    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 If the problem is not rectified after the power activated. switch is turned off and on again, find the cause of activation of the overcurrent/overvoltage detection circuit in the...

  • Page 213: Engine Test

    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).

  • Page 214: Display

    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 READY OFFLINE...

  • Page 215: Event Log

    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. PRINT EVENT LOG SHOW EVENT LOG (Select .) The Event Log retains the printer’s last 30 error messages.

  • Page 216

    Most recent error (up to 30) Figure 7-3 Sample Event Log 7-14 Troubleshooting...

  • Page 217: Display The Event Log, Print The Event Log

    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. INFORMATION MENU Press [Menu] until appears. SHOW EVENT LOG Press [Item] until appears. Press [Select] to show the Event Log.

  • Page 218: Interpret The Event Log

    Personality (PCL or PostScript) column or the cause of the jam at the time of the error. The event log for early versions of the HP LaserJet 4000 series printer may record errors in a different format than the Control Panel 13.20 PAPER JAM...

  • Page 219: Printer Messages

    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...

  • Page 220

    Table 7-5. Alphabetical Printer Messages Control Panel Event Log Explanation Recommended Message Message Action ACCESS DENIED The Control Panel Ask the network MENUS LOCKED function you are trying to administrator to unlock the access has been locked function. by the network administrator to prevent unauthorized access.

  • Page 221

    SYSTEM IS FULL EIO disk and then try again, or add a flash DIMM. 2. Download or delete files from HP JetAdmin, and download or delete fonts from HP FontSmart. (See the software help for more information.) Troubleshooting the Printing System 7-19...

  • Page 222

    The EIO disk is protected, Disable the write WRITE PROTECTED and no new files can be protection through written to it. HP JetAdmin. EIO n DISK The disk accessory card INITIALIZING takes a long time to initialize. The first parameter is the accessory slot number for this disk accessory card.

  • Page 223

    1. Delete files from the SYSTEM IS FULL flash DIMM or add another DIMM. 2. Download or delete files from HP JetAdmin, and download or delete fonts from HP FontSmart. (See the software help for more information.) Troubleshooting the Printing System 7-21...

  • Page 224

    FLASH IS The flash DIMM is Disable the write WRITE PROTECTED protected, and no new protection through files can be written to it. HP JetAdmin. INITIALIZING If the message displays Reseat DIMM(s). continually, a DIMM may not be inserted completely.

  • Page 225

    Table 7-5. Alphabetical Printer Messages (continued) Control Panel Event Log Explanation Recommended Message Message Action LOADING Programs and fonts can Wait for the program to PROGRAM <NUMBER> be stored on the printer’s load. file system. At bootup time alternates with DO NOT POWER OFF these entities are loaded into RAM.

  • Page 226

    Table 7-5. Alphabetical Printer Messages (continued) Control Panel Event Log Explanation Recommended Message Message Action MEMORY SETTINGS The printer changed its You might want to change CHANGED memory settings because memory settings for I/O it did not have enough Buffering and Resource memory to use the Saving (although default previous settings for I/O...

  • Page 227

    (Delete files using HP JetAdmin, HP FontSmart, or another software utility. See the software help for more information.) 2. If the message persists, increase the size of the RAM disk.

  • Page 228

    PS105 detects paper in 3. Check Sensor Arm Tray 1. Flags for damage and be PS107 detects paper in sure they move freely. Tray 3 (HP LaserJet 4. Replace any defective 4050 T/4050 TN). sensors. PS801 detects paper in the optional 500-sheet feeder.

  • Page 229

    Table 7-5. Alphabetical Printer Messages (continued) Control Panel Event Log Explanation Recommended Message Message Action TRAY X LOAD One of the following 1. Load the requested [TYPE] [SIZE] occurred: paper into the specified There is no paper loaded tray ( in the specified tray, or the Ensure that the trays are paper is not the size...

  • Page 230

    Table 7-5. Alphabetical Printer Messages (continued) Control Panel Event Log Explanation Recommended Message Message Action UNABLE TO Memory or file system MOPY JOB failures would not allow a mopy job to occur. Only one copy will be produced. UNSUPPORTED SIZE An external paper Load a supported paper IN TRAY [YY]...

  • Page 231

    Table 7-6. Numerical Printer Messages Control Panel Event Log Explanation Recommended Message Message Action 13.XX PAPER JAM Paper is jammed at the For all paper jam [LOCATION] specified location (and messages, do the possibly at other following: locations). 1. Remove jammed paper If the message persists from the specified after all jams have been...

  • Page 232

    Table 7-6. Numerical Printer Messages (continued) Control Panel Event Log Explanation Recommended Message Message Action 13.5 13.6 13.5 PAPER JAM 13.5 Paper delay jam at Fuser. For 1. Check the Transfer Roller and Small Media 13.6 PAPER JAM 13.6 Paper stopped jam at Belt to ensure they are Fuser.

  • Page 233

    Table 7-6. Numerical Printer Messages (continued) Control Panel Event Log Explanation Recommended Message Message Action 20 INSUFFICIENT The printer received more Press [Go] to print the MEMORY data than can fit in its transferred data (some available memory. You data might be lost), then alternates with PRESS GO TO might have tried to...

  • Page 234

    PRESS GO TO driver you are using is not (Some non-HP parallel IEEE-1284 compliant. For cables might be missing CONTINUE best results, use an HP pin connections, or might driver that came with the otherwise not conform to printer. the IEEE-1284 specification.)

  • Page 235

    Table 7-6. Numerical Printer Messages (continued) Control Panel Event Log Explanation Recommended Message Message Action 40 BAD SERIAL The printer encountered 1. Verify cable TRANSMISSION an error while transferring connections. Make sure data from the computer. the printer’s serial alternates with PRESS GO TO The error might have configuration is set the...

  • Page 236

    Table 7-6. Numerical Printer Messages (continued) Control Panel Event Log Explanation Recommended Message Message Action 41.3 UNEXPECTED The paper size you are 1. Make sure that all trays PAPER SIZE trying to print is not the are correctly adjusted for same as the settings for size.

  • Page 237

    Table 7-6. Numerical Printer Messages (continued) Control Panel Event Log Explanation Recommended Message Message Action 50.X FUSER ERROR A Fuser error has Turn the printer off, wait occurred. 20 minutes, and then turn X Description: the printer on. 1 = Low Fuser If the message persists, temperature reseat the Fuser.

  • Page 238

    Table 7-6. Numerical Printer Messages (continued) Control Panel Event Log Explanation Recommended Message Message Action 51.X PRINTER ERROR A loss of beam detect 1. Press [Go]. The page occurred. containing the error will automatically be X Description: reprinted. 1 = Beam detect error 2.

  • Page 239

    Table 7-6. Numerical Printer Messages (continued) Control Panel Event Log Explanation Recommended Message Message Action 53.XY.ZZ There is a memory error 1. Turn the printer off, and PRINTER ERROR with an accessory. The reseat or replace the DIMM that caused the specified DIMM.

  • Page 240

    Table 7-6. Numerical Printer Messages (continued) Control Panel Event Log Explanation Recommended Message Message Action 55 PRINTER ERROR An internal 1. Press [Go]. The page communications error containing the error will alternates with PRESS GO TO occurred. automatically be CONTINUE reprinted.

  • Page 241

    Table 7-6. Numerical Printer Messages (continued) Control Panel Event Log Explanation Recommended Message Message Action 59.X PRINTER ERROR A printing error occurred. 1. Turn the printer off, and X Description: then turn the printer on. 0 = Motor error 2. Check and reseat the 1 = Motor startup error Fuser and Toner Cartridge 2 = Motor rotation error...

  • Page 242

    Table 7-6. Numerical Printer Messages (continued) Control Panel Event Log Explanation Recommended Message Message Action 68 NVRAM ERROR An error occurred in the 1. Print a Configuration CHECK SETTINGS printer’s nonvolatile Page and check the memory (NVRAM) and printer settings to one or more printer determine which values settings has been reset to...

  • Page 243

    Table 7-6. Numerical Printer Messages (continued) Control Panel Event Log Explanation Recommended Message Message Action 79.XXXX The printer detected an 1. Turn the printer off, and PRINTER ERROR error. The numbers then turn the printer on. XXXX ) indicate the 2.

  • Page 244

    Table 7-6. Numerical Printer Messages (continued) Control Panel Event Log Explanation Recommended Message Message Action 8X.YYYY The EIO accessory in slot 1. Turn the printer off, and has encountered a then turn the printer on. critical error as specified 2. Reseat or replace the YYYY EIO board.

  • Page 245

    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 Error Description Solution Number Disk volume not present – it •...

  • Page 246

    • 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. Disk Error • Contact your HP Service and Support Representative. 7-44 Troubleshooting...

  • Page 247: General Paper Path Troubleshooting

    (either the Top Output Bin (page 7-47). or Rear Output Bin)? Do paper jams occur with a specific type of Try different media. See the HP LaserJet Printer Family Paper Specification Guide . The paper? guide is bundled with this service manual.

  • Page 248

    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.

  • Page 249: Paper Path Test

    Paper Path Test To perform a Paper Path Test: INFORMATION MENU Press [Menu] until appears. PRINT PAPER PATH TEST Press [Item] until appears. Press [Select]. Press to cycle selections until the desired paper tray appears. Press [Select]. Press until the desired output bin appears (open the Rear Output Bin to print to it).

  • Page 250: Information Pages

    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.

  • Page 251

    Figure 7-5 Sample Menu Map (4000 series printer) Troubleshooting the Printing System 7-49...

  • Page 252

    Figure 7-6 Sample Menu Map (4050 series printer) 7-50 Troubleshooting...

  • Page 253: Configuration Page

    (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: INFORMATION MENU...

  • Page 254: Troubleshooting

    Printer Information Memory Lists the serial number, HP JetSend Lists printer memory, PCL Driver work space IP addresses, page counts, and other (DWS), and I/O buffering and resource saving information for the printer. information. Installed Security Personalities Lists the and Options...

  • Page 255

    Printer Information Memory Lists the serial number, HP JetSend IP Lists printer memory, PCL Driver work addresses, page counts, and other space (DWS), and I/O buffering and information for the printer. resource saving information. addresses, page counts, and other information for the printer.

  • Page 256: Image Quality

    Is the customer using print For more information about HP’s paper specification standards, media that meets all HP see Chapter 1 of this manual and the HP LaserJet Family Paper paper specification Specification Guide . standards?

  • Page 257: Check The Toner Cartridge

    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.

  • Page 258

    Print Quality Menu. CAUTION HP does not recommend full-time use of EconoMode. If EconoMode is used full-time, it is possible that the Toner supply will outlast the mechanical parts in the Toner Cartridge.

  • Page 259: Image Defects

    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.

  • Page 260

    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 Clean the high-voltage power supply terminals.

  • Page 261

    Table 7-12. Blank Page Possible Cause Action No Toner is available Remove sealing tape or replace the Toner for print. Cartridge. Defective laser Check the laser shutter for free operation when shutter. inserting the Toner Cartridge. Toner Cartridge Guide Make sure the guide is installed properly above the damaged, improperly Toner Cartridge.

  • Page 262

    Table 7-13. Blank Spots Possible Cause Action Paper does not meet 1. Print a few more pages to see if the problem printer specifications corrects itself. or is stored 2. Turn over the stack of paper in the tray. Also try improperly.

  • Page 263

    Table 7-14. Creases Possible Cause Action Paper does not meet 1. Print a few more pages to see if the problem printer specifications corrects itself. or is stored 2. Turn over the stack of paper in the tray. Also try improperly.

  • Page 264

    Table 7-15. Curl Possible Cause Action Paper does not meet 1. Print a few more pages to see if the problem printer specifications corrects itself. or is stored 2. Turn over the stack of paper in the tray. Also try improperly.

  • Page 265

    Table 7-16. Contamination on Back Possible Cause Action Contamination inside 1. Print at least 10 pages to see if the problem goes printer (Tray away. Separation Roller, 2. Print a cleaning page (page 4-4). Feed Roller, Transfer Identify and clean the contaminated part according Roller, Fuser, Toner to the “Repetitive Defect Ruler”...

  • Page 266

    Table 7-17. Distorted Image Possible Cause Action Paper does not meet 1. Print a few more pages to see if the problem printer specifications corrects itself. or is stored 2. Turn over the stack of paper in the tray. Also try improperly.

  • Page 267

    Table 7-18. Dropouts Possible Cause Action Paper might be too Check the paper (or other print media) type and smooth. quality. Printer’s operating Make sure the printer’s operating environment meets environment does not specifications. meet specifications. Wrong Toner density From the print quality menu on the Control Panel, setting.

  • Page 268

    Table 7-20. Gray Background Possible Cause Action Paper does not meet 1. Print a few more pages to see if the problem printer specifications corrects itself. or is stored 2. Turn over the stack of paper in the tray. Also try improperly.

  • Page 269

    Table 7-21. Horizontal Black Lines Possible Cause Action Defective Laser 1. See the “Repetitive Defect Ruler” on page 7-73. Scanner Assembly or 2. Reseat connectors on the Laser Scanner and Engine Controller Engine Controller Board. Board. 3. Replace the Laser Scanner Assembly followed by the Engine Controller Board, if necessary.

  • Page 270

    Table 7-24. Light Print, Dark Print, or Fade Possible Cause Action Wrong Toner density From the print quality menu on the Control Panel, setting. adjust the Toner density setting. Make sure EconoMode is off. Toner Cartridge is low. Replace the Toner Cartridge. Transfer Roller is Replace the Transfer Roller.

  • Page 271

    Table 7-25. Loose Toner Possible Cause Action Contamination in the 1. Print a few more pages to see if the problem printer. 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 Replace the Toner Cartridge.

  • Page 272

    Table 7-27. Skew Possible Cause Action Paper does not meet 1. Print a few more pages to see if the problem printer specifications corrects itself. or is stored 2. Turn over the stack of paper in the tray. Also try improperly.

  • Page 273

    Table 7-29. Toner Specks Possible Cause Action Contamination in 1. Print a few more pages to see if the problem printer. 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 1.

  • Page 274

    Table 7-31. Vertical Dots Possible Cause Action Contaminated Static Clean the Static Eliminator. Eliminator teeth. 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.

  • Page 275: Repetitive Defect Ruler

    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.

  • Page 276: Image System Troubleshooting

    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)

  • Page 277: Drum Rotation Functional Check

    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: Open the Top Cover. Remove the Toner Cartridge.

  • Page 278

    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.

  • Page 279: Interface Troubleshooting

    Before attempting to troubleshoot a network problem or notifying your network consultant of a problem, always print a Configuration Page. See the HP JetDirect Network Interface Configuration Guide for detailed explanations of network issues. Troubleshooting the Printing System 7-77...

  • Page 280

    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...

  • Page 281

    Sample JetDirect Configuration Page (4050 series printer) Troubleshooting the Printing System 7-79...

  • Page 282: Hp Jetdirect Configuration

    HP JetDirect Configuration If the HP EIO JetDirect Card has successfully powered up and I/O CARD READY completed its internal diagnostics, the message I/O NOT READY appears. If communication is lost, an message appears followed by a two-digit error code. See the HP JetDirect Network Interface Configuration Guide for further details and recommended action.

  • Page 283: Autoexec.bat Standard Configurations

    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.

  • Page 284: Communications Checks

    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.

  • Page 285

    CAUTION HP LaserJet printers are not designed to work with mechanical switch-box products without proper surge protection. These devices generate high transient voltages that cause permanent damage to the Formatter PCA.

  • Page 286: Reference Diagrams, Locations Of Components

    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...

  • Page 287

    Table 7-35. Components in Figure 7-11 PS101 Tray 2 Paper Out Sensor PS102 Pre-Feed Sensor PS103 Top of Page Sensor PS104 Top Output Bin Full Sensor PS105 Tray 1 Paper Out Sensor PS106 Fuser Delivery Sensor 2 PS501 Fuser Delivery Sensor 1 SL101 Tray Pickup Solenoid SL102...

  • Page 288

    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...

  • Page 289

    Figure 7-13 Components of the Duplexer Reference Diagrams 7-87...

  • Page 290

    Figure 7-14 Components of the Fusing and Delivery Unit 7-88 Troubleshooting...

  • Page 291

    Figure 7-15 Components of the Envelope Feeder Reference Diagrams 7-89...

  • Page 292: Paper Path

    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...

  • Page 293

    Figure 7-18 Paper Path with the Envelope Feeder Reference Diagrams 7-91...

  • Page 294

    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.

  • Page 295

    Engine Controller Board Figure 7-20 Engine Controller Board Layout Table 7-37. Engine Controller Board Layout Power switch SW501 Test print switch VR201 Adjusted at factory VR501 Top of page adjustment VR601 Adjusted at factory Reference Diagrams 7-93...

  • Page 296: Paper Size Detection Switches

    Paper Size Detection Switches (1 of 3), Tray 2 (HP LaserJet 4000/4000 N and 4050/4050 N) Tray 3 Tray 2 Switches Switches Figure 7-22 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...

  • Page 297

    Figure 7-23 Paper Size Detection Switches (3 of 3), Optional 500-sheet Universal Tray Assembly Table 7-38. Paper Size Detection Switches in Figure 7-21 to Figure 7-23 Paper Size Paper Size Detection Switch SW600/603/801 SW601/604/802 SW602/605/803 No tray Legal Executive Letter Other Other Reference Diagrams 7-95...

  • Page 298

    Motors Figure 7-24 Location of Motors Table 7-39. Motors in Figure 7-24 M101 Main Motor M701 Reversing Motor (Duplexer) M702 Duplex Feed Motor (Duplexer) FM101 Cooling Fan FM701 Duplexer Exhaust Fan (Duplexer) H901 Fusing Heater 7-96 Troubleshooting...

  • Page 299: Connectors

    Connectors Figure 7-25 Connectors (1 of 3) Reference Diagrams 7-97...

  • Page 300

    Figure 7-26 Connectors (2 of 3) 7-98 Troubleshooting...

  • Page 301

    Figure 7-27 Connectors (3 of 3) For locations of connectors see the wiring diagrams at the back of this manual. Reference Diagrams 7-99...

  • Page 302: Pcas

    PCAs Figure 7-28 Location of PCAs 7-100 Troubleshooting...

  • Page 303

    Table 7-40. Location of PCAs Engine Controller Board Sequence control, High-voltage output, DC output, and Heater Drive. Paper Size Detection Relay between Sensors/Solenoids and Engine Controller Board, and Paper Size Detection. Paper Feeder Driver PCA Control and detection of solenoids in the Paper Feeder. Envelope Feeder Driver Control and detection of solenoids in the Envelope Feeder.

  • Page 304: Sensors And Thermistor

    Sensors and Thermistor Figure 7-29 Location of Sensors and Thermistor (1 of 2) 7-102 Troubleshooting...

  • Page 305

    Top Output Bin Full Sensor PS105 Tray 1 Paper Out Sensor PS106 Fuser Paper Delivery Sensor 2 PS107 Tray 3 Paper Out Sensor (HP LaserJet 4000 T/TN and 4050 T/TN) PS501 Fuser Paper Delivery Sensor 1 PS701 Duplex Pickup Paper Sensor (Duplexer)

  • Page 306

    Table 7-41. Sensors and Thermistor in Figure 7-29 and Figure 7-30 (continued) PS703 Reversed Paper Sensor (Duplexer) PS801 Paper Feeder Paper Sensor (Paper Feeder) PS901 Envelope Sensor (Envelope Feeder) PS902 Envelope Multiple Feed Sensor (Envelope Feeder) TH901 Fusing Surface Temperature Sensor 7-104 Troubleshooting...

  • Page 307: Solenoids And Clutch

    Solenoids and Clutch Figure 7-31 Location of Solenoids and Clutch (1 of 2) Reference Diagrams 7-105...

  • Page 308

    Figure 7-32 Location of Solenoids and Clutch (2 of 2) 7-106 Troubleshooting...

  • Page 309

    Feed Roller Clutch SL101 Tray 2 Pickup Solenoid SL102 Tray 1 Pickup Solenoid SL103 Tray 3 Pickup Solenoid (HP LaserJet 4000 T/TN and 4050 T/TN) SL701 Duplexer Solenoid (Duplexer) SL801 Paper Feeder Pickup Solenoid (Paper Feeder) SL901 Envelope Pickup Solenoid (Envelope Feeder)

  • Page 310: Switches

    Switches Figure 7-33 Location of Switches 7-108 Troubleshooting...

  • Page 311

    Tray 2 Paper size switch SW602 Tray 2 Paper size switch SW603 Tray 3 paper size switch (HP LaserJet 4000 T/TN and 4050 T/TN) SW604 Tray 3 paper size switch (HP LaserJet 4000 T/TN and 4050 T/TN) SW605 Tray 3 paper size switch (HP LaserJet 4000 T/TN and 4050 T/TN)

  • Page 312: Timing

    Timing Figure 7-34 Pickup Timing for Tray 2 (and lower trays) Figure 7-35 Pickup Timing for Tray 1 7-110 Troubleshooting...

  • Page 313

    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...

  • Page 314: How To Use The Parts Lists And Diagrams

    Consumables and accessories such as those listed in Table 8-1 can be ordered from Hewlett-Packard. The phone numbers are: U.S.: (800) 538-8787 Canada: 1-800-387-3154 (Toronto) 516-671-8383 United Kingdom: 0734-441212 Germany: 0130-3322 Contact your local HP Parts Coordinator for other phone numbers. 8-2 Parts and Diagrams...

  • Page 315

    Note Parts that have no item number or part number listed are not field replacement parts and cannot be ordered. How To Use the Parts Lists and Diagrams 8-3...

  • Page 316: Accessories And Supplies

    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.

  • Page 317

    Table 8-1. Accessories and Supplies (continued) Description Part No. Exchange No. Product No. Font DIMM (8 MB Asian MROM) Traditional Chinese C4292A Simplified Chinese C4293A Euro FIR Receiver (4050 only) C4103-67901 C4103A Hard Disk C2985A Parallel Cables 2 Meter IEEE-1284 cable C2950A 3 Meter IEEE-1284 cable C2951A...

  • Page 318: Common Screws And Replacement Cables

    Common Screws and Replacement Cables Table 8-2. Screws Used in the Printer Description Part No. Screw, M4x10, self-tapping (black) XA9-0870-000CN Screw, M3x4, washer head XA9-0434-000CN Screw, M3x6, with star washer FA9-1449-000CN Screw, M3x6, washer head XA9-0267-000CN Screw, M4x12, self-tapping XA9-0773-000CN Screw, M4x116, long, module RB1-8703-000CN Screw, M4x10, self-tapping (silver)

  • Page 319

    Table 8-3. Replaceable Cables Description Part No. Table No. Item No. Cable and Power Receptacle RG5-3696-000CN Table 8-7 on page 8-15 Cable, Tray 1 Sensor RG5-3700-000CN Table 8-7 on page 8-15 Cable, Laser Scanner, and Output RG5-3876-000CN Table 8-8 on Bin Sensor page 8-17 Cable, Paper Feed/Tray 1 Pickup...

  • Page 320: Illustrations And Parts Lists

    Illustrations and Parts Lists Laser Scanner Top Cover Assembly Assembly Tray 1 Pickup Paper Assembly Delivery Assembly Fusing Assembly Tray 1 Assembly Delivery Drive Assembly Formatter Paper Feed Assembly Guide Assembly Printer Drive Assembly Registration Assembly Paper Feed Engine Controller Assembly Board Assembly Figure 8-1...

  • Page 321

    Table 8-4. Assemblies (Listed Alphabetically) and Their Part Numbers Description Part No. Exchange No. Exploded View in Figure Delivery Drive RG5-3721-000CN Figure 8-8 on page Assembly 8-24 EIO Cover 5021-0349 Engine Controller RG5-3693-000CN (110V) C4118-69006 (110V) Figure 8-7 on page Board RG5-3694-000CN (220V) C4118-69007 (220V)

  • Page 322

    Figure 8-2 External Covers and Panels 8-10 Parts and Diagrams...

  • Page 323

    Table 8-5. External Covers and Panels Item No. Part No. Quantity Description RB1-8858-000CN Panel, Formatter Cover RG5-2664-000CN Cover Assembly, Right Front RB1-8860-000CN Clip, Right Side Panel RB1-8849-000CN Power Switch Button RG5-2667-000CN Tray 1 Door Assembly RB1-8848-000CN Clip, Left Side Panel RG5-2665-000CN Cover Assembly, Left RB1-8843-000CN...

  • Page 324

    Figure 8-3 Top Cover Assembly 8-12 Parts and Diagrams...

  • Page 325

    Table 8-6. Top Cover Assembly Item No. Part No. Quantity Description RG5-2663-000CN Top Cover Assembly RB1-8841-000CN Panel, Toner Cartridge access RB1-8846-000CN Latch, Rear Tray RB1-8847-000CN Spring, Rear Tray Latch RB1-8710-000CN Plate Cover Illustrations and Parts Lists 8-13...

  • Page 326

    Figure 8-4 Internal Components (1 of 3) 8-14 Parts and Diagrams...

  • Page 327

    Table 8-7. Internal Components (1 of 3) Item No. Part No. Quantity Description RB1-8862-000CN Guide, Formatter/CP Cable RG5-3708-000CN Cable Formatter/Control Panel RB1-8703-000CN Screw, Module Attachment RH7-1331-000CN Main Motor Assembly RG5-3709-000CN Cable, Main Motor RG5-2645-000CN Support, Top Cover, Right RB1-8694-000CN Strap, Interlock Support Ground RG5-3703-000CN Cable, Paper Feed/Tray 1 Pickup Solenoid...

  • Page 328

    Figure 8-5 Internal Components (2 of 3) 8-16 Parts and Diagrams...

  • Page 329

    Table 8-8. Internal Components (2 of 3) Item No. Part No. Quantity Description RB2-2405-000CN Plate, Control Panel Ground RB1-8671-000CN Support, Top Cover, Left RB1-8827-000CN Leaf Spring RB1-8689-000CN Cable Holder RB1-8708-000CN Plate, Gear Plate Ground RG5-2642-000CN Registration/Feed Sensor Assembly RG5-3706-000CN Cable, Feed/Registration Sensors RG5-3710-000CN Cable, Feeder Module RB1-8690-000CN...

  • Page 330

    Table 8-8. Internal Components (2 of 3) (continued) Item No. Part No. Quantity Description C4118-40002 LJ4000 Overlay (English) C4118-40007 LJ4000 Overlay (French) C4118-40020 LJ4000 Overlay (German) C4118-40008 LJ4000 Overlay (Italian) C4118-40009 LJ4000 Overlay (Portugal) C4118-40010 LJ4000 Overlay (Norway) C4118-40011 LJ4000 Overlay (Hungarian) C4118-40012 LJ4000 Overlay (Swedish) C4118-40013...

  • Page 331

    Notes: Illustrations and Parts Lists 8-19...

  • Page 332

    Figure 8-6 Internal Components (3 of 3) 8-20 Parts and Diagrams...

  • Page 333

    Table 8-9. Internal Components (3 of 3) Item No. Part No. Quantity Description RF5-1867-000CN Pre-Transfer Ground Plate Assembly RG5-4283-000CN Transfer Roller Assembly RS5-0911-000CN Gear, Coupler RF5-2496-000CN Plate, Gear RB1-8747-000CN Plate, Registration Ground Illustrations and Parts Lists 8-21...

  • Page 334

    Figure 8-7 Engine Controller Board Assembly 8-22 Parts and Diagrams...

  • Page 335

    Table 8-10. Engine Controller Board Assembly Item No. Part No. Exchange No. Quantity Description RG5-3693-000CN C4118-69006 Engine Controller Board (110V) RG5-3694-000CN C4118-69007 Engine Controller Board (220V) Illustrations and Parts Lists 8-23...

  • Page 336

    Figure 8-8 Delivery Drive Assembly Table 8-11. Delivery Drive Assembly Item No. Part No. Quantity Description RG5-3721-000CN Delivery Drive Assembly WG8-5362-000CN Sensor, Optical 8-24 Parts and Diagrams...

  • Page 337

    Figure 8-9 Printer Drive Assembly Table 8-12. Printer Drive Assembly Item No. Part No. Quantity Description RG5-2653-000CN Printer Drive Assembly RB1-8757-000CN Guide, Cable, Gear Assembly Plate RB1-8756-000CN Rod, Toner Drive Illustrations and Parts Lists 8-25...

  • Page 338

    Figure 8-10 Tray 1 Pickup Assembly 8-26 Parts and Diagrams...

  • Page 339

    Table 8-13. Tray 1 Pickup Assembly Item No. Part No. Quantity Description RG5-2655-100CN Tray 1 Pickup Assembly RB2-2386-000CN Cover Envelope Feeder Drive RG5-3718-000CN Tray 1 Pickup Roller Assembly RB1-8787-000CN Arm, Tray 1 Paper Sensing RB2-2387-000CN Arm, Tray 1 Retaining RB1-8788-000CN Cover, Tray 1 Sensor Arm RH7-5172-000CN Solenoid, Tray 1 Drive...

  • Page 340

    Figure 8-11 Tray 1 Assembly Table 8-14. Tray 1 Assembly Item No. Part No. Quantity Description RG5-2656-000CN Tray 1 Assembly 8-28 Parts and Diagrams...

  • Page 341

    Figure 8-12 Paper Feed Assembly Table 8-15. Paper Feed Assembly Item No. Part No. Quantity Description RG5-2651-000CN Paper Feed Assembly Illustrations and Parts Lists 8-29...

  • Page 342

    Figure 8-13 Registration Assembly Table 8-16. Registration Assembly Item No. Part No. Quantity Description RG5-2652-070CN Registration Assembly 8-30 Parts and Diagrams...

  • Page 343

    Figure 8-14 Paper Feed Guide Assembly Table 8-17. Paper Feed Guide Assembly Item No. Part No. Quantity Description RG5-2643-000CN Paper Feed Guide Assembly RF5-2495-000CN Shaft, Belt Idler Assembly RB1-8668-000CN Belt, Feed Guide RB1-8674-000CN Shaft, Belt Drive Illustrations and Parts Lists 8-31...

  • Page 344

    Figure 8-15 Delivery Assembly 8-32 Parts and Diagrams...

  • Page 345

    Table 8-18. Delivery Assembly Item No. Part No. Quantity Description RG5-2648-000CN Delivery Assembly RG5-2650-000CN Delivery Sensor Arm Assembly RB2-2408-000CN Arm, Output Kicker, Right RB2-2409-000CN Arm, Output Kicker, Left Illustrations and Parts Lists 8-33...

  • Page 346

    Figure 8-16 Fuser Assembly (1 of 2) Table 8-19. Fuser Assembly (1 of 2) Item No. Part No. Exchange No. Quantity Description RG5-2661-000CN C4118-69003 Fuser (110 V) RG5-2662-000CN C4118-69004 Fuser (220 V) RB1-8805-000CN Panel, Fuser Cover 8-34 Parts and Diagrams...

  • Page 347

    Figure 8-17 Fuser Assembly (2 of 2) Table 8-20. Fuser Assembly (2 of 2) Item No. Part No. Exchange No. Quantity Description RG5-2661-000CN C4118-60003 Fuser (110V) RG5-2662-000CN C4118-60004 Fuser (220V) RG5-4269-000CN Fuser Film Assembly (110V) RG5-4291-000CN Fuser Film Assembly (220V) RB1-8794-000CN Roller, Fuser Pressure Illustrations and Parts Lists 8-35...

  • Page 348

    Figure 8-18 Internal Components of 500-Sheet Feeder 8-36 Parts and Diagrams...

  • Page 349

    Table 8-21. Internal Components of 500-sheet Feeder Item No. Part No. Quantity Description RB1-8890-000CN Guide, Paper RB1-8873-000CN Support, Paper Guide RG5-2668-000CN Cover Feeder Right Assembly RG5-3711-000CN Cable, Sensor RG5-2673-000CN Feeder Controller PCA RB1-8887-000CN Levers, Tray Sensing RB1-8886-000CN Cover, Feeder PCA RG5-3712-000CN Connector, Lower Tray (with cable) RB1-8107-000CN...

  • Page 350

    Figure 8-19 Paper Pickup Drive Assembly 8-38 Parts and Diagrams...

  • Page 351

    Table 8-22. Paper Pickup Drive Assembly Item No. Part No. Quantity Description RG5-2672-000CN Paper Pickup Drive Assembly (500-sheet) RS5-2632-000CN Spring, Pickup RB1-8877-000CN Coupler, Pickup RF5-2484-000CN Pickup Roller Assembly RB1-2190-000CN Clip, Pickup Spring RB1-8865-000CN Roller, Pickup RF5-2490-000CN Feed, Roller RB1-8879-000CN Arm, Tray Sensing Illustrations and Parts Lists 8-39...

  • Page 352

    Figure 8-20 500-sheet Tray 8-40 Parts and Diagrams...

  • Page 353

    Table 8-23. 500-sheet Tray Item No. Part No. Quantity Description RB1-8947-000CN Panel, Roller Access RF5-2489-000CN Mounting Assembly Separation Roller RB1-8948-000CN Gear, Separation Roller Drive RB1-8946-000CN Bushing, Separation Roller RB1-8945-000CN Coupler, Separation Roller RS5-2622-000CN Spring, Separation Roller Tension RF5-2670-000CN Paper Stop, 500-sheet Tray RF5-2490-000CN Roller RB1-8974-000CN...

  • Page 354

    Figure 8-21 Internal Components of 250-sheet Module (1 of 2) 8-42 Parts and Diagrams...

  • Page 355

    Table 8-24. Internal Components of 250-sheet Module (1 of 2) Item No. Part No. Quantity Description XA9-0870-000CN Screw, M4x10, Feed Modules RG5-2677-000CN Cover Assembly, Feeder, Upper Right RS5-1309-000CN Bearing, Transport Roller XD9-0135-000CN E-Clip RB1-8923-000CN Roller, Transport RB1-8922-000CN Roller, Transport Pressure RS5-2653-000CN Spring, Transport Roller RB1-8926-000CN...

  • Page 356

    Figure 8-22 Internal Components of 250-sheet Feeder (2 of 2) 8-44 Parts and Diagrams...

  • Page 357

    Table 8-25. Internal Components of 250-sheet Feeder (2 of 2) Item No. Part No. Quantity Description RG5-2679-000CN Cover Assembly, Feeder, Right Lower RG5-2680-000CN Cover Assembly, Feeder, Left Lower RB1-8907-000CN Cover, Feeder PCA RG5-2685-000CN Feeder, Control PCA RB1-9033-000CN Levers, Tray Sensing Upper RB1-9034-000CN Levers, Tray Sensing Lower XA9-0917-000CN...

  • Page 358

    Figure 8-23 Upper Paper Pickup Drive Assembly Table 8-26. Upper Paper Pickup Drive Assembly Item No. Part No. Quantity Description RG5-2683-000CN Upper Paper Pickup Drive Assembly (250-sheet) RB1-8910-000CN Arm, Tray Sensing 8-46 Parts and Diagrams...

  • Page 359

    Figure 8-24 Lower Paper Pickup Drive Assembly Table 8-27. Lower Paper Pickup Drive Assembly Item No. Part No. Quantity Description RG5-2684-000CN Lower Paper Pickup Drive Assembly (250-sheet) RB1-8910-000CN Arm, Tray Sensing Illustrations and Parts Lists 8-47...

  • Page 360

    Figure 8-25 250-sheet Tray 8-48 Parts and Diagrams...

  • Page 361

    Table 8-28. 250-sheet Tray Item No. Part No. Quantity Description RF5-2505-000CN 1 each Mounting Assembly Separation Roller RB1-9001-000CN 1 each Panel Roller Access RF5-2490-000CN 1 each Roller RB1-9009-000CN 1 each Paper Level Indicator RB1-9012-010CN 1 each Left Arm Lifter RB1-9013-010CN 1 each Right Arm Lifter Illustrations and Parts Lists 8-49...

  • Page 362

    Figure 8-26 Internal Components of Optional 500-sheet Universal Tray Assembly 8-50 Parts and Diagrams...

  • Page 363

    Table 8-29. Internal Components of Optional 500-sheet Universal Tray Assembly Item No. Part No. Quantity Description XD2-1100-502CN Ring, E RG5-2690-000CN Paper Pickup Drive Assembly, Optional (500-sheet) RB1-8865-000CN Roller VS1-6174-000CN Connector RB1-8928-000CN Tray Identifier Plunger RS5-2967-000CN Spring, Compression RB1-8915-000CN Frame, Right RG5-2688-000CN Left Frame Assembly RB1-8927-000CN...

  • Page 364

    Figure 8-27 Optional 500-sheet Universal Tray Assembly 8-52 Parts and Diagrams...

  • Page 365

    Table 8-30. Optional 500-sheet Universal Tray Assembly Item No. Part No. Quantity Description RF5-2489-000CN Separation Roller Mounting Assembly RB1-9374-000CN Stopper RS5-2981-000CN Spring RB1-9371-000CN Plate RF5-2490-000CN Feed Roller RB1-9009-000CN Paper Level Indicator RB1-8961-000CN Left Arm Lifter RB1-8962-000CN Right Arm Lifter Illustrations and Parts Lists 8-53...

  • Page 366

    Figure 8-28 Envelope Feeder 8-54 Parts and Diagrams...

  • Page 367

    Table 8-31. Envelope Feeder Item No. Part No. Exchange No. Quantity Description C4122A C4122-69001 Envelope Feeder RB1-9088-000CN Tray, Envelope Feeder RF5-2511-000CN Weight, Envelope RB1-9095-000N Mount, Envelope Weight Illustrations and Parts Lists 8-55...

  • Page 368

    Figure 8-29 Internal Components of Duplexer 8-56 Parts and Diagrams...

  • Page 369

    Table 8-32. Internal Components of Duplexer Item No. Part No. Exchange No. Quantity Description C4123A C4123-69001 Duplexer RB1-9044-000CN Cover, Top RB1-9047-000CN Cover, Right Duplexer RF5-1876-000CN Cover, Left with Connector RB1-9045-000CN Panel, Rear RH7-1361-000CN Illustrations and Parts Lists 8-57...

  • Page 370: Alphabetical Parts List

    Alphabetical Parts List Table 8-33. Alphabetical Parts List Description Part Number Table Number and Page 250-sheet Universal C4126A Table 8-1 on page 8-4 Replacement Tray 500-sheet Paper Feeder and C4124A Table 8-1 on page 8-4 Tray 500-sheet Universal C4125A Table 8-1 on page 8-4 Replacement Tray AC, Power Receptacle RG5-3696-000CN...

  • Page 371

    Table 8-33. Alphabetical Parts List (continued) Description Part Number Table Number and Page Cable, Paper Feed/Tray 1 RG5-3703-000CN Table 8-7 on page 8-15 Pickup Solenoid Cable, Sensor RG5-3711-000CN Table 8-21 on page 8-37 Cable, Top Cover Switch RG5-3705-000CN Table 8-7 on page 8-15 Cable, Tray 1 Sensor RG5-3700-000CN Table 8-7 on page 8-15...

  • Page 372

    Table 8-33. Alphabetical Parts List (continued) Description Part Number Table Number and Page Cover Feeder Right Assembly RG5-2668-000CN Table 8-21 on page 8-37 Cover, Left with Connector RF5-1876-000CN Table 8-32 on page 8-57 Cover, Right Duplexer RB1-9047-000CN Table 8-32 on page 8-57 Cover, Top RB1-9044-000CN Table 8-32 on page 8-57...

  • Page 373

    Table 8-21 on page 8-37 Guide, Paper, Lower RB1-8914-000CN Table 8-24 on page 8-43 Hard Disk C2985A Table 8-1 on page 8-4 HP LaserJet Paper HPJ1124 Table 8-1 on page 8-4 HP Multi-purpose Paper HPM1120 Table 8-1 on page 8-4 Laser Shutter Arm...

  • Page 374

    Table 8-33. Alphabetical Parts List (continued) Description Part Number Table Number and Page Levers, Tray Sensing Lower RB1-9034-000CN Table 8-25 on page 8-45 Levers, Tray Sensing Upper RB1-9033-000CN Table 8-25 on page 8-45 Lower Paper Pickup Drive RG5-2684-000CN Table 8-27 on page 8-47 Assembly (250-sheet) Lower Tray Logic PCA RG5-3821-000CN...

  • Page 375

    Table 8-33. Alphabetical Parts List (continued) Description Part Number Table Number and Page Paper Feeder Cable RG5-3822-000CN Table 8-29 on page 8-51 Paper Pickup Drive Assembly, RG5-2690-000CN Table 8-29 on page 8-51 Optional 500-sheet Tray Paper Pickup Drive Assembly RG5-2672-000CN Table 8-22 on page 8-39 (500-sheet) Paper Stop, 500-sheet Tray...

  • Page 376

    Table 8-33. Alphabetical Parts List (continued) Description Part Number Table Number and Page Roller, Transport Pressure RB1-8922-000CN Table 8-24 on page 8-43 Screw, M3x16, Feed Modules XA9-0917-000CN Table 8-21 on page 8-37, Table 8-24 on page 8-43, and Table 8-25 on page 8-45 Screw, M3x4, washer head XA9-0434-000CN Table 8-2 on page 8-6...

  • Page 377

    Table 8-33. Alphabetical Parts List (continued) Description Part Number Table Number and Page Spring, Leaf RB1-8927-000CN Table 8-29 on page 8-51 Spring, Pickup RS5-2632-000CN Table 8-22 on page 8-39 Spring, Rear Tray Latch RB1-8847-000CN Table 8-6 on page 8-13 Spring, Separation Roller RS5-2622-000CN Table 8-23 on page 8-41 Tension...

  • Page 378

    Table 8-33. Alphabetical Parts List (continued) Description Part Number Table Number and Page Tray, Rear Extension RB1-8844-000CN Table 8-5 on page 8-11 Upper Paper Pickup Drive RG5-2683-000CN Table 8-26 on page 8-46 Assembly (250-sheet) Weight, Envelope RF5-2511-000CN Table 8-31 on page 8-55 8-66 Parts and Diagrams...

  • Page 379: Numerical Parts List

    C2985A Hard Disk Table 8-1 on page 8-4 C3122A Standard 500-sheet Tray Table 8-1 on page 8-4 C4103A HP Fast InfraRed Receiver (LJ 4050 only) C4118-40002 Overlay (English) Table 8-8 on page 8-17 RBI-8861-000CN Maintenance Kit Table 8-1 on page 8-4...

  • Page 380

    Traditional Chinese C4293A Simplified Chinese FA9-1449-000CN Screw, M3x6, with star washer Table 8-2 on page 8-6 HPJ1124 HP LaserJet Paper Table 8-1 on page 8-4 HPM1120 HP Multi-Purpose Paper Table 8-1 on page 8-4 Enhanced I/O Cards Table 8-1 on page 8-4...

  • Page 381

    Table 8-34. Numerical Parts List (continued) Part Number Description Table Number and Page RB1-8690-000CN Retainer, Toner Sensing Table 8-8 on page 8-17 Spring RB1-8693-000CN Spring, Toner Cartridge Drum Table 8-8 on page 8-17 Ground RB1-8694-000CN Strap, Interlock Support Table 8-7 on page 8-15 Ground RB1-8695-000CN Spring, Toner Sensing...

  • Page 382

    Table 8-34. Numerical Parts List (continued) Part Number Description Table Number and Page RB1-8858-000CN Panel, Formatter Cover Table 8-5 on page 8-11 RB1-8860-000CN Clip, Right Side Panel Table 8-5 on page 8-11 RB1-8862-000CN Guide, Formatter/cp Cable Table 8-7 on page 8-15 RB1-8865-000CN Roller, Pickup Table 8-22 on page 8-39...