This manual covers the HP LaserJet M9040/M9050 MFP, a robust and versatile multifunction printer designed for demanding office environments. Engineered for reliability and efficiency, this device offers advanced copying, scanning, and faxing capabilities, along with optional finishing features to enhance document production. Its comprehensive functionality and high-quality output make it an ideal solution for businesses seeking a powerful and dependable document management system.
This service manual provides detailed instructions and technical information necessary for the proper maintenance, diagnosis, and repair of the HP LaserJet M9040/M9050 MFP. It includes in-depth explanations of product basics, control panel operations, paper handling, and management procedures. Furthermore, the manual details the theory of operation, step-by-step removal and replacement procedures for components, troubleshooting guides for common issues, and comprehensive parts lists with diagrams. This resource is intended for owners, technicians, and service professionals to ensure optimal performance and longevity of the device.
		        	Service Manual & Parts List HP Laserjet M9040/9050 MFP;
This service manual, is the full HP Laserjet M9040/9050 MFP Service Repair Manual.
This manual, HP Laserjet M9040/9050 MFP, is in the PDF format and have detailed Diagrams, pictures and full procedures to diagnose and repair your HP Laserjet M9040/9050 MFP copier.
You can print, zoom or read any diagram, picture or page from this Service Manual. Every chapter on this manual is fully detailed and contain all the simulation codes, trouble codes, maintenance procedures, reset procedures, diagnose procedures of HP Laserjet M9040/9050 MFP photocopier. You can find easily everything what do you need.
To see what contain, please read table of contents:
1. Product basics
Product introduction 
Product features 
Product walkaround 
Output devices 
3,000-sheet stacker 
3,000-sheet stapler/stacker 
Paper handling features 
Stapling information 
Multifunction finisher 
Paper handling features 
Stapling information 
Booklets 
8-bin mailbox 
2. Control panel
Use the control panel 
Control-panel layout 
Home screen 
Buttons on the touchscreen 
Control-panel help system 
Use the Administration menu 
Navigate the Administration menu 
Information menu 
Default Job Options menu 
Default Options for Originals 
Default Copy Options 
Default Fax Options 
Default E-mail Options 
Default Send to Folder Options 
Default Print Options 
Time/Scheduling menu 
Management menu 
Initial Setup menu 
Networking and I/O 
Fax Setup 
E-mail Setup 
Send Setup menu 
Device Behavior menu 
Print Quality menu 
Troubleshooting menu 
Resets menu 
Service menu 
3. Paper and print media
Understand paper and print media use 
Supported paper and print media sizes 
Custom paper sizes 
Special paper or print media guidelines 
Load paper and print media 
Load Tray 1 
Load Trays 2, 3, and 4 
Configure trays 
Configure a tray when loading media 
Configure a tray by using the Supplies Status button on the touchscreen 
Select the media by source, type, or size 
Source 
Type and Size 
Select the output bin 
Select an output location 
Printing 
Copying 
4. Manage and maintain
Information pages 
Embedded Web server 
Open the embedded Web server by using a network connection 
Embedded Web server sections 
HP Easy Printer Care 
Supported operating systems 
Open the HP Easy Printer Care software 
HP Easy Printer Care software sections 
Use HP Web Jetadmin software 
HP Printer Utility for Macintosh 
Open the HP Printer Utility 
Print a cleaning page 
Print a configuration page 
View supplies status 
Order supplies online and use other support features 
Upload a file to the product 
Update the firmware 
Activate the two-sided printing (duplexing) mode 
Lock or unlock storage devices 
Save or print stored jobs 
Configure trays 
Change network settings 
Open the embedded Web server 
Set up e-mail alerts 
Security features 
Secure the embedded Web server 
Secure Disk Erase 
Data affected 
Gain access to Secure Disk Erase 
Additional Information 
Security lock 
Authentication 
Lock the control-panel menus 
Set the real-time clock 
Clean the product 
Print a cleaning page 
Clean the product hardware 
Clean the ADF delivery system 
Configure alerts 
Manage supplies 
HP print cartridges 
Non-HP print cartridges 
Print cartridge authentication 
HP fraud hotline 
Print cartridge storage 
Print cartridge life expectancy 
Check the print cartridge life 
Control panel 
Embedded Web server 
HP Easy Printer Care 
HP Web Jetadmin 
Printer maintenance kit 
Manage memory 
Determine memory requirements 
Install memory 
Verify memory installation 
Economy settings 
Sleep and wake 
5. Theory of operation
Basic operation 
Sequence of operation 
Product start up sequence (turn on product) 
Timing chart 
Scanner subsystem 
Mechanical structure 
Motors and fans 
Basic block diagram 
Basic system configuration 
Scanner unit systems 
Scan mode 
Power supply assembly 
Sleep mode 
Low-voltage power supply circuit 
Protective functions 
Scanner controller circuit 
Flatbed operation 
Flatbed document exposure control 
Flatbed optical drive control 
Flatbed optical unit operation 
Flatbed document size detection 
ADF operation 
ADF document exposure control 
ADF document feed control 
ADF document size detection 
ADF feeder sensors 
ADF document skew detection 
Scanned data flow 
Copy processor 
Scanning process control signals 
Typical scanning process flow 
Engine control system 
DC controller PCA 
High-voltage power supply circuit 
Low-voltage power supply 
Fuser control circuit 
Formatter system 
Formatter hardware 
Laser/scanner system 
Image formation system 
The image formation process 
Print cartridge 
Print cartridge design 
No-shake toner 
Cartridge memory 
Toner seal 
Toner level detection 
Pickup and feed system 
Media-size detection 
Media-level detection 
Multifeed prevention 
Transparency media detection 
Fuser-wrapping jam detection 
Jam detection 
Tray 1 
Tray 1 driver PCA 
Tray 1 power supply 
Tray 1 sequence of operation 
Tray 1 pickup and feed 
Tray 1 jam detection 
Tray 4 
Tray 4 driver PCA 
Tray 4 power supply 
Tray 4 sequence of operation 
Tray 4 pickup and feed 
Tray 4 media level and media size detection 
Tray 4 jam detection 
6. Removal and replacement
Removal and replacement strategy 
Repair notices 
Electrostatic discharge 
Required tools 
Product orientation 
Front and right side orientation 
Back and left side orientation 
Scanner assembly covers 
Control panel 
Reinstall the control panel 
ADF feeder cover 
Reinstall the ADF feeder cover 
ADF feeder cover handle 
ADF back cover 
ADF front cover 
Lower delivery roller cover 
Reinstall the delivery roller cover 
White board cover 
Copy processor/connect board 
Reinstall the copy processor/connect board 
Flatbed rail cover 
Flatbed back cover 
Flatbed right cover 
Reinstall the flatbed right cover 
Flatbed left cover 
Flatbed upper front cover 
Flatbed lower front cover 
ADF base cover assembly 
Reinstall the ADF base cover assembly 
Scanner glass 
Reinstall the scanner glass 
Scan engine internal assemblies 
ADF and flatbed internal assemblies 
ADF main assembly 
Reinstall the ADF main assembly 
ADF optical assembly 
Reinstall the ADF optical assembly 
ADF shading filter 
Flatbed optical unit 
Reinstall the flatbed optical unit 
Switch and solenoids 
ADF feeder cover detection switch 
Weight solenoid 
Shutter solenoid 
Motors and fans 
Pickup motor 
Reinstall the pickup motor 
Delivery motor 
Reinstall 
Flatbed motor 
Reinstall the flatbed motor 
Power supply assembly 
Reinstall power supply assembly 
ADF fan assembly 
Reinstall the ADF fan assembly 
Flatbed fan assembly 
Rollers and belts 
Pickup roller (D roller) 
Pickup roller assembly 
Reinstall the pickup roller assembly 
Feed roller assembly 
Lower registration roller assembly 
Reinstall the lower registration assembly 
Lower delivery roller 
Reinstall the lower delivery roller 
Upper delivery roller assembly 
Reinstall the upper delivery roller assembly 
Separation belt assembly 
Reinstall the separation belt assembly 
Separation belts 
Reinstall the separation belts 
PCAs 
ADF intermediate PCA 
ADF width detection sensor assembly 
Reinstall the ADF width detection sensor assembly 
Flatbed intermediate PCA 
Scanner controller board 
Intermediate PCA 
Scan engine 
Reinstall the scan engine 
Laser/scanner assembly 
Delivery fan assembly 
Delivery motor 
Print engine covers 
Front cover 
Right door 
Right lower cover 
Left upper cover 
Reinstall the left upper cover 
Left door and diverter 
Left back cover 
Back cover 
Right and left rail covers 
Front assemblies 
Cartridge release lever 
Print cartridge 
Reinstall the print cartridge 
Transfer-roller assembly 
Reinstall the transfer-roller assembly 
Tray 2 and Tray 3 (interchangeable) 
Rollers (pickup, feed, or separation) 
Fuser-jam-removal knob 
Reinstall the fuser-jam-removal knob 
Registration-jam-removal knob 
Reinstall the registration-jam-removal knob 
Right assemblies 
Tray 1 
Paper-input unit (PIU) 
Reinstall the paper-input unit 
Registration assembly 
Reinstall the registration assembly 
Transfer-guide assembly 
Reinstall the transfer-guide assembly 
Left assemblies 
Duplexer 
Fuser assembly 
Back assemblies 
Formatter 
Low-voltage power supply 
High-voltage power supply 
DC controller 
Toner-sensor contact assembly 
Reinstall the toner-sensor contact assembly 
Drum motor 
Feed-drive assembly 
Reinstall the feed-drive assembly 
Power-supply fan (fan 1) 
Cartridge fan (fan 5) 
Reinstall the cartridge fan 
Controller fan (fan 2) 
Jetlink connector 
Duplexer connector holder assembly 
Fuser delivery-drive assembly 
Reinstall the fuser delivery assembly 
Tray 4 
Orientation 
Tray 4 left side cover 
Reinstall the Tray 4 left side cover 
Tray 4 right side cover 
Reinstall the Tray 4 right side cover 
Tray 4 back covers 
Tray 4 center back cover 
Tray 4 right back cover 
Tray 4 left back cover 
Tray 4 
Tray 4 rollers (pickup, feed, and separation) 
Reinstall the Tray 4 rollers 
Tray 4 registration assembly 
Tray 4 drive motor 
Tray 4 drive assembly 
Tray 4 controller board 
Paper-size detection switch PCA 
Reinstall the paper-size switch PCA 
Tray 4 power supply 
Tray 4 pickup assembly 
Tray 4 paper-connecting unit 
7. Solve problems
Troubleshooting process 
Preliminary operating checks 
Installation environment 
Media checks 
Scanner and ADF checks 
General troubleshooting information 
Abnormal noises are evident, such as grinding or chattering when the main motor is
turned on 
Media does not feed from Tray X when printing from a software program; the paperpath
test is successful 
Media does not print from Tray 4 
The product stops printing and hangs on certain jobs 
Envelopes are wrinkling 
Fusing is poor 
The product feeds from an incorrect tray when different media is selected for the first
page of the job 
Power-on checks 
Malfunction troubleshooting 
Troubleshooting by using control-panel messages 
Event log page 
Print the event log 
Interpret the event log 
Sample event log 
View the event log 
Control-panel error messages 
User- and service-level diagnostics 
Copy processor LEDs 
Troubleshooting menu 
Paper-path test 
Print a paper-path test 
Service test 
Perform a service test 
Service-level diagnostics 
Engine test 
Service menu 
Other diagnostics 
Boot-up key sequences 
Low-level boot-up key sequence for selecting a language, performing a cold
reset, and enabling and disabling embedded LAN 
Medium-level boot-up key sequence for initializing disks 
High-level boot-up key sequence for NVRAM initialization, manufacturing,
and skipping disk-load and calibration 
Drum rotation functional check 
Calibrations 
Control panel touchscreen calibration 
Simplified scanner and ADF calibration 
ADF calibrations 
Left side front calibration 
Left side back calibration 
Leading edge front calibration 
Leading edge back calibration 
ADF plain scaling calibration 
ADF heavy scaling calibration 
Glass calibrations 
Left side glass calibration 
Leading edge glass calibration 
Glass scaling calibration 
Plain motor speed calibration 
Measurement and adjustment 
ADF unit height adjustment 
ADF skew adjustment 
ADF width sensor adjustment 
Weight solenoid stroke adjustment 
Tray 4 diagnostics 
Motor test 
Standalone running test 
Sensor test 
Light-pattern interpretation 
Clear jams 
Jam locations 
ADF jams 
Clear jams from the duplexer 
Clear jams from the input-tray areas 
Clear jams from the output areas 
Solve repeated jams 
Image-formation troubleshooting 
Print image defects 
Print/stop test 
Economode 
Skew 
Copy-image defects 
Scanner controller PCA 
Connector locations 
Electrical structure 
Wiring diagrams 
Image-defect tables 
Repeating defect ruler 
Media troubleshooting 
Determine the problem source 
Isolate the paper path 
Try using the straightest paper path 
Check the duplexing path 
Isolate the source of a jam 
Determine the location of a jam 
Determine whether the product is experiencing misfeeds or multifeed
jams 
Isolate a media brand 
Isolate a media type 
Communication troubleshooting 
Communications check 
EIO troubleshooting 
Jetdirect configuration 
Embedded LAN troubleshooting 
Error codes 
LAN diagnostics 
Wiring diagrams 
8. Parts and diagrams
Order parts, accessories, and supplies 
Supplies part numbers 
Consumables, supplies, accessories, FRUs, and documents 
Common hardware 
Illustrations and parts lists 
Scanner assembly 
Scanner engine covers and panels 
Print engine covers and panels 
Flatbed scanner assembly 
Flatbed optical assembly 
ADF scanner assembly 
ADF paper pickup assembly 
ADF main assembly 
ADF optical assembly 
Scanner engine PCAs 
Left door and diverter 
Right cover assembly 
Print engine internal components 
Drum feed drive assembly 
Fuser delivery drive assembly 
Cartridge lifter assembly 
500-sheet trays (Tray 2 and Tray 3) 
Paper input unit 
Registration assembly 
Transfer roller assembly 
Delivery assembly 
PCA locations 
Tray 4 main body 
Tray 4 drive assembly 
Tray 4 PCA location 
Tray 1 assembly 
Alphabetical parts list 
Numerical parts list 
Appendix A Service and support
Hewlett-Packard limited warranty statement 
Customer self repair warranty service 
Print cartridge limited warranty statement 
HP Customer Care 
Online Services 
Telephone support 
Software utilities, drivers, and electronic information 
HP direct ordering for accessories or supplies 
HP service information 
HP service agreements 
HP Easy Printer Care 
HP support and information for Macintosh computers 
Appendix B Specifications
Physical specifications 
Electrical specifications 
Acoustic emissions 
Operating environment 
Appendix C Regulatory information
FCC regulations 
Declaration of conformity 
Certificate of volatility 
Types of memory 
Volatile memory 
Non-volatile memory 
Hard-disk-drive memory 
Safety statements 
Laser safety 
Canadian DOC regulations 
VCCI statement (Japan) 
Power cord statement (Japan) 
EMI statement (Korea) 
EMI statement (Taiwan) 
Laser statement for Finland 
Substances table (China) 
Index 
Numbers of pages: 586.
		Service Manual & Parts List HP Laserjet M9040/9050 MFP;
This service manual, is the full HP Laserjet M9040/9050 MFP Service Repair Manual.
This manual, HP Laserjet M9040/9050 MFP, is in the PDF format and have detailed Diagrams, pictures and full procedures to diagnose and repair your HP Laserjet M9040/9050 MFP copier.
You can print, zoom or read any diagram, picture or page from this Service Manual. Every chapter on this manual is fully detailed and contain all the simulation codes, trouble codes, maintenance procedures, reset procedures, diagnose procedures of HP Laserjet M9040/9050 MFP photocopier. You can find easily everything what do you need.
To see what contain, please read table of contents:
1. Product basics
Product introduction 
Product features 
Product walkaround 
Output devices 
3,000-sheet stacker 
3,000-sheet stapler/stacker 
Paper handling features 
Stapling information 
Multifunction finisher 
Paper handling features 
Stapling information 
Booklets 
8-bin mailbox 
2. Control panel
Use the control panel 
Control-panel layout 
Home screen 
Buttons on the touchscreen 
Control-panel help system 
Use the Administration menu 
Navigate the Administration menu 
Information menu 
Default Job Options menu 
Default Options for Originals 
Default Copy Options 
Default Fax Options 
Default E-mail Options 
Default Send to Folder Options 
Default Print Options 
Time/Scheduling menu 
Management menu 
Initial Setup menu 
Networking and I/O 
Fax Setup 
E-mail Setup 
Send Setup menu 
Device Behavior menu 
Print Quality menu 
Troubleshooting menu 
Resets menu 
Service menu 
3. Paper and print media
Understand paper and print media use 
Supported paper and print media sizes 
Custom paper sizes 
Special paper or print media guidelines 
Load paper and print media 
Load Tray 1 
Load Trays 2, 3, and 4 
Configure trays 
Configure a tray when loading media 
Configure a tray by using the Supplies Status button on the touchscreen 
Select the media by source, type, or size 
Source 
Type and Size 
Select the output bin 
Select an output location 
Printing 
Copying 
4. Manage and maintain
Information pages 
Embedded Web server 
Open the embedded Web server by using a network connection 
Embedded Web server sections 
HP Easy Printer Care 
Supported operating systems 
Open the HP Easy Printer Care software 
HP Easy Printer Care software sections 
Use HP Web Jetadmin software 
HP Printer Utility for Macintosh 
Open the HP Printer Utility 
Print a cleaning page 
Print a configuration page 
View supplies status 
Order supplies online and use other support features 
Upload a file to the product 
Update the firmware 
Activate the two-sided printing (duplexing) mode 
Lock or unlock storage devices 
Save or print stored jobs 
Configure trays 
Change network settings 
Open the embedded Web server 
Set up e-mail alerts 
Security features 
Secure the embedded Web server 
Secure Disk Erase 
Data affected 
Gain access to Secure Disk Erase 
Additional Information 
Security lock 
Authentication 
Lock the control-panel menus 
Set the real-time clock 
Clean the product 
Print a cleaning page 
Clean the product hardware 
Clean the ADF delivery system 
Configure alerts 
Manage supplies 
HP print cartridges 
Non-HP print cartridges 
Print cartridge authentication 
HP fraud hotline 
Print cartridge storage 
Print cartridge life expectancy 
Check the print cartridge life 
Control panel 
Embedded Web server 
HP Easy Printer Care 
HP Web Jetadmin 
Printer maintenance kit 
Manage memory 
Determine memory requirements 
Install memory 
Verify memory installation 
Economy settings 
Sleep and wake 
5. Theory of operation
Basic operation 
Sequence of operation 
Product start up sequence (turn on product) 
Timing chart 
Scanner subsystem 
Mechanical structure 
Motors and fans 
Basic block diagram 
Basic system configuration 
Scanner unit systems 
Scan mode 
Power supply assembly 
Sleep mode 
Low-voltage power supply circuit 
Protective functions 
Scanner controller circuit 
Flatbed operation 
Flatbed document exposure control 
Flatbed optical drive control 
Flatbed optical unit operation 
Flatbed document size detection 
ADF operation 
ADF document exposure control 
ADF document feed control 
ADF document size detection 
ADF feeder sensors 
ADF document skew detection 
Scanned data flow 
Copy processor 
Scanning process control signals 
Typical scanning process flow 
Engine control system 
DC controller PCA 
High-voltage power supply circuit 
Low-voltage power supply 
Fuser control circuit 
Formatter system 
Formatter hardware 
Laser/scanner system 
Image formation system 
The image formation process 
Print cartridge 
Print cartridge design 
No-shake toner 
Cartridge memory 
Toner seal 
Toner level detection 
Pickup and feed system 
Media-size detection 
Media-level detection 
Multifeed prevention 
Transparency media detection 
Fuser-wrapping jam detection 
Jam detection 
Tray 1 
Tray 1 driver PCA 
Tray 1 power supply 
Tray 1 sequence of operation 
Tray 1 pickup and feed 
Tray 1 jam detection 
Tray 4 
Tray 4 driver PCA 
Tray 4 power supply 
Tray 4 sequence of operation 
Tray 4 pickup and feed 
Tray 4 media level and media size detection 
Tray 4 jam detection 
6. Removal and replacement
Removal and replacement strategy 
Repair notices 
Electrostatic discharge 
Required tools 
Product orientation 
Front and right side orientation 
Back and left side orientation 
Scanner assembly covers 
Control panel 
Reinstall the control panel 
ADF feeder cover 
Reinstall the ADF feeder cover 
ADF feeder cover handle 
ADF back cover 
ADF front cover 
Lower delivery roller cover 
Reinstall the delivery roller cover 
White board cover 
Copy processor/connect board 
Reinstall the copy processor/connect board 
Flatbed rail cover 
Flatbed back cover 
Flatbed right cover 
Reinstall the flatbed right cover 
Flatbed left cover 
Flatbed upper front cover 
Flatbed lower front cover 
ADF base cover assembly 
Reinstall the ADF base cover assembly 
Scanner glass 
Reinstall the scanner glass 
Scan engine internal assemblies 
ADF and flatbed internal assemblies 
ADF main assembly 
Reinstall the ADF main assembly 
ADF optical assembly 
Reinstall the ADF optical assembly 
ADF shading filter 
Flatbed optical unit 
Reinstall the flatbed optical unit 
Switch and solenoids 
ADF feeder cover detection switch 
Weight solenoid 
Shutter solenoid 
Motors and fans 
Pickup motor 
Reinstall the pickup motor 
Delivery motor 
Reinstall 
Flatbed motor 
Reinstall the flatbed motor 
Power supply assembly 
Reinstall power supply assembly 
ADF fan assembly 
Reinstall the ADF fan assembly 
Flatbed fan assembly 
Rollers and belts 
Pickup roller (D roller) 
Pickup roller assembly 
Reinstall the pickup roller assembly 
Feed roller assembly 
Lower registration roller assembly 
Reinstall the lower registration assembly 
Lower delivery roller 
Reinstall the lower delivery roller 
Upper delivery roller assembly 
Reinstall the upper delivery roller assembly 
Separation belt assembly 
Reinstall the separation belt assembly 
Separation belts 
Reinstall the separation belts 
PCAs 
ADF intermediate PCA 
ADF width detection sensor assembly 
Reinstall the ADF width detection sensor assembly 
Flatbed intermediate PCA 
Scanner controller board 
Intermediate PCA 
Scan engine 
Reinstall the scan engine 
Laser/scanner assembly 
Delivery fan assembly 
Delivery motor 
Print engine covers 
Front cover 
Right door 
Right lower cover 
Left upper cover 
Reinstall the left upper cover 
Left door and diverter 
Left back cover 
Back cover 
Right and left rail covers 
Front assemblies 
Cartridge release lever 
Print cartridge 
Reinstall the print cartridge 
Transfer-roller assembly 
Reinstall the transfer-roller assembly 
Tray 2 and Tray 3 (interchangeable) 
Rollers (pickup, feed, or separation) 
Fuser-jam-removal knob 
Reinstall the fuser-jam-removal knob 
Registration-jam-removal knob 
Reinstall the registration-jam-removal knob 
Right assemblies 
Tray 1 
Paper-input unit (PIU) 
Reinstall the paper-input unit 
Registration assembly 
Reinstall the registration assembly 
Transfer-guide assembly 
Reinstall the transfer-guide assembly 
Left assemblies 
Duplexer 
Fuser assembly 
Back assemblies 
Formatter 
Low-voltage power supply 
High-voltage power supply 
DC controller 
Toner-sensor contact assembly 
Reinstall the toner-sensor contact assembly 
Drum motor 
Feed-drive assembly 
Reinstall the feed-drive assembly 
Power-supply fan (fan 1) 
Cartridge fan (fan 5) 
Reinstall the cartridge fan 
Controller fan (fan 2) 
Jetlink connector 
Duplexer connector holder assembly 
Fuser delivery-drive assembly 
Reinstall the fuser delivery assembly 
Tray 4 
Orientation 
Tray 4 left side cover 
Reinstall the Tray 4 left side cover 
Tray 4 right side cover 
Reinstall the Tray 4 right side cover 
Tray 4 back covers 
Tray 4 center back cover 
Tray 4 right back cover 
Tray 4 left back cover 
Tray 4 
Tray 4 rollers (pickup, feed, and separation) 
Reinstall the Tray 4 rollers 
Tray 4 registration assembly 
Tray 4 drive motor 
Tray 4 drive assembly 
Tray 4 controller board 
Paper-size detection switch PCA 
Reinstall the paper-size switch PCA 
Tray 4 power supply 
Tray 4 pickup assembly 
Tray 4 paper-connecting unit 
7. Solve problems
Troubleshooting process 
Preliminary operating checks 
Installation environment 
Media checks 
Scanner and ADF checks 
General troubleshooting information 
Abnormal noises are evident, such as grinding or chattering when the main motor is
turned on 
Media does not feed from Tray X when printing from a software program; the paperpath
test is successful 
Media does not print from Tray 4 
The product stops printing and hangs on certain jobs 
Envelopes are wrinkling 
Fusing is poor 
The product feeds from an incorrect tray when different media is selected for the first
page of the job 
Power-on checks 
Malfunction troubleshooting 
Troubleshooting by using control-panel messages 
Event log page 
Print the event log 
Interpret the event log 
Sample event log 
View the event log 
Control-panel error messages 
User- and service-level diagnostics 
Copy processor LEDs 
Troubleshooting menu 
Paper-path test 
Print a paper-path test 
Service test 
Perform a service test 
Service-level diagnostics 
Engine test 
Service menu 
Other diagnostics 
Boot-up key sequences 
Low-level boot-up key sequence for selecting a language, performing a cold
reset, and enabling and disabling embedded LAN 
Medium-level boot-up key sequence for initializing disks 
High-level boot-up key sequence for NVRAM initialization, manufacturing,
and skipping disk-load and calibration 
Drum rotation functional check 
Calibrations 
Control panel touchscreen calibration 
Simplified scanner and ADF calibration 
ADF calibrations 
Left side front calibration 
Left side back calibration 
Leading edge front calibration 
Leading edge back calibration 
ADF plain scaling calibration 
ADF heavy scaling calibration 
Glass calibrations 
Left side glass calibration 
Leading edge glass calibration 
Glass scaling calibration 
Plain motor speed calibration 
Measurement and adjustment 
ADF unit height adjustment 
ADF skew adjustment 
ADF width sensor adjustment 
Weight solenoid stroke adjustment 
Tray 4 diagnostics 
Motor test 
Standalone running test 
Sensor test 
Light-pattern interpretation 
Clear jams 
Jam locations 
ADF jams 
Clear jams from the duplexer 
Clear jams from the input-tray areas 
Clear jams from the output areas 
Solve repeated jams 
Image-formation troubleshooting 
Print image defects 
Print/stop test 
Economode 
Skew 
Copy-image defects 
Scanner controller PCA 
Connector locations 
Electrical structure 
Wiring diagrams 
Image-defect tables 
Repeating defect ruler 
Media troubleshooting 
Determine the problem source 
Isolate the paper path 
Try using the straightest paper path 
Check the duplexing path 
Isolate the source of a jam 
Determine the location of a jam 
Determine whether the product is experiencing misfeeds or multifeed
jams 
Isolate a media brand 
Isolate a media type 
Communication troubleshooting 
Communications check 
EIO troubleshooting 
Jetdirect configuration 
Embedded LAN troubleshooting 
Error codes 
LAN diagnostics 
Wiring diagrams 
8. Parts and diagrams
Order parts, accessories, and supplies 
Supplies part numbers 
Consumables, supplies, accessories, FRUs, and documents 
Common hardware 
Illustrations and parts lists 
Scanner assembly 
Scanner engine covers and panels 
Print engine covers and panels 
Flatbed scanner assembly 
Flatbed optical assembly 
ADF scanner assembly 
ADF paper pickup assembly 
ADF main assembly 
ADF optical assembly 
Scanner engine PCAs 
Left door and diverter 
Right cover assembly 
Print engine internal components 
Drum feed drive assembly 
Fuser delivery drive assembly 
Cartridge lifter assembly 
500-sheet trays (Tray 2 and Tray 3) 
Paper input unit 
Registration assembly 
Transfer roller assembly 
Delivery assembly 
PCA locations 
Tray 4 main body 
Tray 4 drive assembly 
Tray 4 PCA location 
Tray 1 assembly 
Alphabetical parts list 
Numerical parts list 
Appendix A Service and support
Hewlett-Packard limited warranty statement 
Customer self repair warranty service 
Print cartridge limited warranty statement 
HP Customer Care 
Online Services 
Telephone support 
Software utilities, drivers, and electronic information 
HP direct ordering for accessories or supplies 
HP service information 
HP service agreements 
HP Easy Printer Care 
HP support and information for Macintosh computers 
Appendix B Specifications
Physical specifications 
Electrical specifications 
Acoustic emissions 
Operating environment 
Appendix C Regulatory information
FCC regulations 
Declaration of conformity 
Certificate of volatility 
Types of memory 
Volatile memory 
Non-volatile memory 
Hard-disk-drive memory 
Safety statements 
Laser safety 
Canadian DOC regulations 
VCCI statement (Japan) 
Power cord statement (Japan) 
EMI statement (Korea) 
EMI statement (Taiwan) 
Laser statement for Finland 
Substances table (China) 
Index 
Numbers of pages: 586.