HP laserjet schematic

May 1998 Edition

HP LaserJet Family Quick Reference Service Guide

Volume II

HP LaserJet Family Quick Reference Service Guide

Volume II

Publication number 5021-8942

First edition, May 1998

Warranty

The information contained in this document is subject to change without notice.

Hewlett-Packard makes no warranty of any kind with respect to this information. HEWLETTPACKARD SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

Hewlett-Packard shall not be liable for any direct, indirect, incidental, consequential, or other damage alleged in connection with the furnishing or use of this information.

Trademark credits

MS-DOS® is a U.S. registered trademark of Microsoft Corporation.

UNIX is a registered trademark in the United States and other countries, licensed exclusively through X/Open Company Limited.

Hewlett-Packard Company 11311 Chinden Boulevard Boise, Idaho 83714 U.S.A.

Contents

1 Control panel messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Error listings, descriptions, and recommended actions

2 Service mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

How to access Service mode and related functions

3 Power supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

DC voltages, test points, and tools

4 Input/Output (I/O) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Printer interface and cabling information

5 Media specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Supported sizes and specifications for paper and special media

6 Toner cartridge information. . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Cartridge weights, capacities, and potential service issues

7 Printer options and replaceable parts. . . . . . . . . . . . . . . . . . 101

Support matrix and part numbers for accessories

8 Printer parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Selected high-usage replacement parts

9 Image quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

Image defect samples, suspect causes, and remedies

10 Wiring diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

Main wiring schematics

11 Services and support/resources and training . . . . . . . . . . . 173

How and where to get training, support, and materials

12 Hewlett-Packard LaserJet Companion . . . . . . . . . . . . . . . . . 179

HP LaserJet information and specifications

A Acronyms and abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . 183

Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

iii

Ordering other manuals

The HP LaserJet Quick Reference Service Guide

support for newer monochrome printers (see the following page for a complete list of supported printers). It has been created to help the HP LaserJet service engineer quickly troubleshoot common printer problems.

For older monochrome printers, see the

Service Guide,

LJ 6L, LJ 5Si Mopier, LJ 5Si, LJ 5Si MX, LJ 5L, LJ 6P, LJ 6MP, LJ 5P, LJ 5MP, LJ 5, LJ 5M, LJ 5N, LJ 4V, LJ 4MV, LJ 4P, LJ 4MP, LJ 4L, LJ 4ML, LJ 4+, LJ 4M+, LJ4, LJ 4M, LJ 4Si, LJ 4Si MX, LJ IIISi, LJ IIIP, LJ IIP+, LJ IIP, LJ IIID, LJ III, LJ IID, LJ II, LJ 2686D, LJ 2686A.

While the quick reference guides are intended to provide all the information the service engineer will need for on-site repair of HP products, they are not intended to replace the service manual for any HP LaserJet product. For detailed information about the HP LaserJet products described in this guide, see the user guide or service manual for that product.

Service manuals for HP LaserJet products are available from Hewlett-Packard. The phone number for the Service Parts Order Desk is:

Volume I. It provides support for the following printers:

HP LaserJet Quick Reference

, Volume II, provides

(800) 227-8164 (U.S. only)

If you are located outside of the U.S., contact your local HP Sales and Service office.

Supported products

Reference name used in this guide

LJ 4000/4000T 4000N/4000TN

LJ Companion LJ C3989A/

LJ 5000/5000N/ 5000GN

LJ 3100 C3948A 6K C3948-90958 LJ8000/8000N/

8000DN LJ Mopier 240 C4228A 130K C4085-91017

Model number

C4118A/C4119A/ C4120A/C4121A

C3979A/C4106A C4110A/C4111A/

C4112A

C4085A/C4086A/ C4087A

Maximum pages per month

65K C4118-99024

N/A HP Central

65K C4110-91033

130K C4085-91017

Service Manual part number

Repair Only

Note

This guide will be updated on a regular basis as the service needs change, as new products are introduced, and as information becomes available.

Control panel

messages

Overview

This chapter provides a list of printer control panel messages. Alphabetical messages are listed first, followed by numerical messages. Control panel messages that are self-explanatory are not included. If you need more detailed information, see the service manual for the printer.

Chapter 1 –

Alphabetical messages

(number) is a group, group not allowed

• Enter a different one-touch key or an unassigned speed-dial code.

Access denied, menus locked

• Ask the network administrator to unlock the function.

Already in group

• While programming a group-dial code, a fax number has been

added that is already in the group. – Add the next fax number to the group.

Bad duplexer connection

• Re-install the duplexer.

• If the message persists, make sure that the duplexer is connected

and that the connector is not damaged.

• Replace the duplexer.

Bad opt tray connection

• Re-install the optional tray.

• Make sure that the optional tray is connected and that the connector

is not damaged.

• Replace the optional tray.

8 – Control panel messages

Blacklisted (France only)

• The attempted fax number has received a voice answer or no

answer, was busy on the first dial and redials, or was busy with redials pending.

– Unplug the power cord for the fax machine from the power strip

or outlet, and then plug it back in.

Busy

• Check the fax number and try resending the fax. If the message

appears again, try sending to another fax machine or try again later.

Cancel group edit,

• Back space was pressed while in a group-dial code in the Group

Dial Setup level of the menu.

1 2

Press Press

(Press Press

to return to the group-dial code and continue editing.

[Start]

[Enter/Menu]

[Stop/Clear]

ENTER

to go to the Group Dial Setup level of the menu.

again to choose a different group-dial code.)

to exit the Menu settings.

Check finisher device

• Check to see if paper is jammed in the external paper-handling

finishing device.

Check finisher device

to confirm

alternates with

Clear jam

Finisher align

error

• Check to see if an alignment error has occurred in the external

paper-handling finishing device.

Chapter 1 –

Check input device

alternates with

Paper path open,

please close it

• Check the doors and trays.

• Check the tabs and sensor levers in the tray for proper operation.

– Replace any defective tabs or sensors.

• Replace the printed-circuit assembly (PCA) controller in the feeder.

Check output device

alternates with

Close output

delivery path

• Make sure the paper path is closed between the printer and the

external paper-handling output device.

Chosen language not available

1 Print the job using a driver for a different printer language, or add the

requested language to the printer (if available).

2 Press [Go] to continue.

Clear document from scanner

• Check to see if the document is jammed or if multiple sheets of the

document were loaded.

• Check the special media lever. It should be to the left for regular-

weight items or to the right for thick items. Thick items must be fed one at a time.

• Check the control panel configuration for outgoing faxes, including

the “send long pages” setting.

10 – Control panel messages

Close top cover

• Check SW101 for proper operation. Verify that the wires are

connected.

• If necessary, replace SW101.

– If the new switch does not solve the error, the wiring or the

engine controller board may be defective.

Communication error

Try resending the fax.

If the call fails again, check that the telephone cord is securely

connected. Then check for a dial tone on the phone line by pressing

[Manual Dial]

Wait; try resending the fax later.

Note

For additional details, see the

Manual

HP LaserJet 3100 Product Service

Configuration err # (number 1-4)

• An error was detected in the static random-access memory (SRAM).

– Unplug the power cord from the power source, wait 10 seconds,

and replug the power cord.

• If the error persists, replace the formatter.

Config. stuck addr

• In Service mode only, SRAM stuck address test.

– Unplug the power cord from the power source, wait 10 seconds,

and replug the power cord.

• If the error persists, replace the formatter.

Chapter 1 –

Config. tied addr.

• In Service mode only, SRAM tied address test.

– Unplug the power cord from the power source, wait 10 seconds,

and replug the power cord.

• If the error persists, replace the formatter.

[Date] [Time]

• The battery has failed. You can continue to use the HP LaserJet

3100 product without replacing the battery, but if you re-enter the Menu settings and then turn off the power, the settings are erased again.

Decoding error # (number 1-3)

• Unplug the power cord from the power source, wait 10 seconds , and

replug the power cord.

• If the error persists, replace the formatter.

Disk device failure

• Reseat the enhanced input/output (EIO) disk or replace the old disk

device with a new disk.

Disk file operation failed

• Check the filename and directory name.

• Reattempt the operation.

Disk file system is full

• Delete the files from the EIO disk and then try again, or add a Flash

dual inline memory module (DIMM).

• Download or delete files from the HP JetAdmin software, and

download or delete fonts from the HP FontSmart software.

12 – Control panel messages

Disk is write protected

• Use the HP JetAdmin software to disable the write protection.

Documents were lost, START to continue

Press

Check the fax log status column for the “Fax Document was Lost”

message. Resend the associated outgoing faxes. Ask the sender to resend

incoming faxes.

. A report is printed.

[Start]

Duplex error, check duplexer

• Check the duplexer for a paper jam.

• Reseat the duplex assembly, and check the connection.

• Replace the Duplex unit.

EIO x disk initializing

• Stand by until the EIO disk is done initializing.

EIO x disk spinning up

• Stand by until the disk accessory card is done initializing.

EIO disk x non-functional

• Replace the EIO disk.

Encoding error

• Unplug the power cord from the power source, wait 10 seconds , and

replug the power cord.

• If the error persists, replace the formatter

Chapter 1 –

Envelope feeder load

1 Load the requested envelope type and size into the en v elope feeder. 2 Make sure that the envelope size and type are set correctly on the

Paper-Handling menu in the printer control panel.

3 Press [Go] if the envelope is already loaded in the feeder. 4 Press [-Value+] to scroll through the available types and sizes.

Errors likely in pages: (page range)

• Resend the fax or ask the sender to resend the fax to you.

Fax document was lost

• If you set up faxes to be sent at a future time or to be polled, print a

fax log to identify which faxes were lost. Then re-enter the faxes.

• Fax es that were received to memory (instead of printing) have been

lost. Ask the sender to resend the fax.

Fax memory error # (number 1-5)

• Unplug the power cord from the power source, wait 10 seconds , and

replug the power cord.

• If you set up faxes to be sent at a future time or to be polled, print a

fax log to identify which fax es may ha ve been lost. Then, re-enter the faxes.

• Fax es that were received to memory (instead of printing) have been

lost. Ask the sender to resend the fax.

• If the error persists, replace the formatter.

Flash device failure

• Remove the Flash DIMM and replace it with a new one.

14 – Control panel messages

Flash file operation failed

• Check the filename and directory name.

• Reattempt the operation.

Flash file system is full

• Delete files from the Flash DIMM or add another DIMM.

• Download or delete files from the HP JetAdmin software, and

download or delete fonts from the HP FontSmart software.

Flash is write protected

• Use the HP JetAdmin software to disable the write protection.

Group is empty, use ONE-TOUCH/SPEED DIAL

Begin adding fax numbers to the group-dial code by pressing the

one-touch key for each number or by pressing Enter the speed-dial code for the fax number.

2 3

Press

[Enter/Menu]

[Speed Dial]

Initializing

• Reseat the DIMM(s).

Chapter 1 –

Input device condition xx.yy

1st x = Device number in chain. 2nd x = Device type (3 types):

1 = Input 2 = Output 3 = Stapler/stacker unit

yy = Device specific error.

• See the documentation that came with the paper-handling device.

Input limit reached

• The maximum number of fax numbers that can be added to an

ad-hoc group is 100. Resend the fax, but only to 100 or fewer fax numbers.

Install front duplex cover

• Re-insert the duplexer’s front cover.

Install tray x

• Re-insert the specified tray.

• Check for damaged tabs in the tray.

• Check for damaged switches in the printer.

• Replace the PCA controller in the feeder.

Invalid date or time

• Re-enter the date and time.

16 – Control panel messages

Keypad test failed

• Run the keypad test again.

• If the error persists, try each of the following in the order given:

– Check the cabling. – Replace the control panel. – Replace the formatter.

Loading program <number>

alternates with

Do not

power off

• Wait for the program to load.

Long page? START to continue

• Press

seconds, the message disappears and the document scanner stops scanning because it thinks the page has jammed.

• If sending a fax or copying a document longer than 991 mm (39 in),

the control panel configuration can also be set to “Send long pages.” This ensures that long pages feed without having to monitor the task. Press

to continue scanning. If

[Start]

before the document scanner shuts off.

[Start]

is not pressed within 3

[Start]

Manually feed [type] [size]

Load the requested paper into Tray 1.

1 2 3 4

Press Press Press

if the appropriate paper is already loaded in Tray 1.

[Go]

[-Value+]

[Select]

to scroll through the available types and sizes.

to accept the alternate type or size.

Memory full - send unscanned pages

• Reload the unscanned pages and re-send them to finish the fax job.

• Scan the unscanned pages to the computer and fax them from the

computer.

Chapter 1 –

Memory full - stored data lost

• Add more memory to the printer or simplify the print job.

Memory is full

• This message should clear automatically when the next task starts

(for example, when you start a copy or receive a fax).

Memory settings changed

• Try changing the memory settings for I/O Buffering and Resource

Saving (although default settings are usually best).

• Install additional memory in the printer.

Memory shortage job cleared

• Press [Go] to continue.

• On the printer control panel, change the setting for resource saving,

or add more memory to the printer.

Memory shortage page simplified

• Press [Go] to continue.

• Add more memory to the printer.

Modem error # (number 1-3)

• Unplug the power cord from the power source, wait 10 seconds , and

replug the power cord.

• If the error persists, try each of the following in the order given:

– Check the cabling. – Replace the LIU. – Replace the formatter.

18 – Control panel messages

No answer

• Check the fax number and try resending the fax. If the message

appears again, try sending to another fax machine or try again later.

No dial tone

• Check that the telephone cord is securely connected.

• Check for a dial tone on the phone line by pressing

• If necessary, check the wall outlet by plugging in a phone and

attempting to place a call.

[Manual Dial]

No fax in (number) tries

• Check the fax number and try resending the fax. If the message

appears again, try sending to another fax machine or try again later.

No fax pages in memory to reprint

• Wait for a fax. As soon as a fax is in the memory, the fax will reprint.

No memory for report, erase/print document

• Print all faxes that have been received in memory.

• If you have several faxes set up to be sent at a future time or to be

polled, use job status to clear them.

No modem installed

• There is a problem with the line interface unit (LIU).

– Unplug the power cord from the power source, wait 10 seconds,

and replug in the power cord.

• If the problem persists, replace the LIU.

• If the problem persists, replace the formatter.

Chapter 1 –

No room in fax log

• The fax log was unable to print because of an error, such as out-of-

paper. – Load paper in the paper input bin so the HP LaserJet 3100

product can print the log.

Not enough memory

• T ry resending the job . If the error persists, try reducing the amount of

activity on the HP LaserJet product. Cancel jobs in memory before resending the job.

Out of memory -- switching to ONE COPY

• The HP LaserJet product continues to copy, but only one copy is

output. – Divide the copy job into smaller sections and then try copying

again.

– If you are collating the job, turn the collation feature off, make

only one copy of the document at a time, or see the user guide for instructions about using the Document Assistant.

Output bin full

alternates with

Clear paper from [bin

name]

1 Remove the media from the face-down tray. 2 Check PS1401 on the sensor PCA. 3 Make sure the sensor flag moves freely.

20 – Control panel messages

Paper bin is empty, please add paper

Load paper.

If paper is already loaded, remove it.

Check for, remove, and discard any jammed sheets.

Reload the paper.

Password must be 4 digits

• Re-enter a four-digit password.

Paused (memory full)

• Reduce activity on the HP LaserJet product, or wait for other jobs to

finish so memory will be freed.

• If faxes are set up to be polled or sent at a future time, y ou ma y want

to cancel these jobs to free memory.

Perform printer maintenance

Reset the maintenance page count only after a maintenance kit has been installed. Resetting the maintenance page count causes

PRINTER MAINTENANCE

series), 200,000 (LJ 4000 series), or 350,000 (LJ 8000) pages have printed.

Hold down the

Turn the printer on.

Wait until

both keys.

RESET MAINTENANCE COUNT

to appear after another 150,000 (LJ 5000

[Item-]

and

[Value-]

keys.

appears, and then release

PERFORM

Chapter 1 –

PC print timed out

• Let the “print jobs retry” continue for 5 minutes. If the HP LaserJet

3100 product still does not print, resend the print job.

Phone number error

• The maximum number of characters that can be entered is 40. If you

have a number longer than 40 characters, break the number into smaller chunks.

1 Enter the first part of the number, and press [Redial/Pause] as the

last character in the first number.

2 Enter the second part of the number as if it were a second number

going to a group. When the product dials, it will treat both numbers as if they are one.

Polling-in error

• Make sure that the sender’s fax machine is ready to be polled, and

check the fax number. Then set up to poll again.

Printer comm error^1

• Check that the parallel cable is securely connected between the

HP LaserJet 3100 product and the computer.

• If the problem persists, unplug the power cord from the power

source for 5 seconds, and then replug it.

• If the problems persists, replace the formatter.

Printer cover open or no cartridge

• Verify that the printer door is closed.

• Check the toner cartridge for proper installation.

22 – Control panel messages

Printer fixing error, replace fixing unit

• There is an error with the print engine.

• Check the cabling to the heating element.

• If the problem persists, replace the heating element.

• If the problem persists, replace the ECU.

Printer is busy

• No action is needed. If you already started another job, the job will

be completed when the HP LaserJet product becomes available.

Printer laser error, call for service

• Open and reclose the printer door.

• Unplug the power cord from the power source, wait 10 seconds , and

replug the power cord.

• If the problem persists, replace the laser scanner assembly.

Printer motor error, call for service

• A problem has occurred with the print engine.

– Unplug the power cord from the power source, wait 10 seconds,

and replug the power cord. – If the problem persists, replace the motor. – If the problem persists, replace the ECU.

Printer paper jam, check paper path

• Check the input areas, the output areas, and the interior for the jam,

and then clear the jam. The job should continue to print. If it does not, try reprinting the job.

Chapter 1 –

Printer signal error

• Open and reclose the printer door.

• Unplug the power cord from the power source, wait 10 seconds , and

replug the power cord.

• If the problem persists, replace the laser scanner assembly.

Processing job from Tray x

• Check the tray selected and the type settings . If the printer does not

respond after you press the control panel keys, turn the printer off, and then turn the printer on to clear the message.

• If paper is loaded when the printer is in Power Save mode, it might

not be recognized. Open and close the affected source when the printer is in Ready mode.

RAM disk device failure

• Turn the printer off and on to clear the message.

• If the message persists, install a new RAM disk.

RAM disk file operation failed

• Check the filename and directory name.

• Reattempt the operation.

24 – Control panel messages

RAM disk file system is full

• Delete files and then try again, or turn the printer off and then turn

the printer on to delete all files on the device. (Use HP JetAdmin software, HP FontSmart software, or another software utility to delete files.)

• If the message persists, increase the size of the RAM disk.

– Change the RAM disk size from the Configuration menu in the

printer control panel.

RAM disk is write protected

• Use HP JetAdmin software to disable the write protection.

Received error

• Ask the sender to resend the fax.

Redial failed

• Try resending the fax. If the fax still fails to transmit, call the recipient

to check that the fax machine is on and working and to verify the fax number.

Remote fax was busy

• Try resending the fax. If the fax still fails to transmit, call the recipient

to check that the fax machine is on is on and working and to verify the fax number.

Scan reference error

• Recalibrate the document scanner.

• If the problem persists, replace the CIS.

Chapter 1 –

Scanner error #1

• An error has occurred within the SRAM.

• Press and hold down the [Stop/Clear] key for 7 seconds to reset the

product.

• If the error persists, unplug the power cord from its power source for

10 seconds, and then replug it.

• If the error persists, replace the CIS.

• If the error persists, replace the formatter.

Scanner isn’t available

• The document scanner mechanism is in use.

– Wait until the document scanner has finished the current job

before sending the next job.

Scanner jam - reload

• Pull open the document release door and then remove the jammed

document.

Speed dial (number) is not assigned

• Choose a speed-dial code that has already been assigned a fax

number.

System error

• Unplug the power cord from the power source, wait 10 seconds , and

replug the power cord.

• If the message is still displayed, replace the formatter.

26 – Control panel messages

There are no documents in memory

• No action is required. There are no faxes to retrieve.

Tray x empty

• Load the empty tray (

• Inspect the tray for damaged tabs.

• Check the sensor-arm flags for damage. Be sure the flags can mov e

freely .

• Replace any defective sensors.

) to clear the message.

Tray x lifting

• Verify that the media can be pulled from another tray.

• Replace the paper input unit.

Tray x load

Load the requested paper into the specified tray (

trays are correctly adjusted for size. Press

Press

Inspect the switches in the tray.

Remove the tray, and then turn the printer on. Push the switches by

hand to see if the switches register.

to print from the next available tray.

[Go]

[-Value+]

[Select]

to scroll through the available types and sizes.

to accept the alternate type or size.

). Ensure that the

Chapter 1 –

Unrecognized format

• When printing, the incorrect printer driver was selected or an error

occurred on the parallel interface.

1 After selecting the Print command in the software application you

are using, select the HP LaserJet 3100 as the printer.

2 Reprint the job.

Unsuccessful call

• Check the fax number and try resending the fax.

• If the message appears again, try sending to another fax machine or

try again later.

Unsupported size in tray [yy]

• Load a supported paper size in the tray.

Use [type] [size] instead?

1 Press [-Value+] to scroll through the available types and sizes. 2 Press [Select] to accept the alternate type or size.

28 – Control panel messages

+ 166 hidden pages

HP laserjet schematic

Specifications and Main Features

Frequently Asked Questions

User Manual