HP LaserJet Pro Color MFP M476 M476dn M476dw M476nw Service Manual and Parts List Manual

This Service Manual contain: Repair Manual and Troubleshooting Manual HP LaserJet Pro Color MFP M476 M476dn M476dw M476nw.
Accurate, clear and concise text, combined with detailed illustrations, lists of error code, instruction and diagrams, guide you through procedure of repair, remediate, maintenance and adjustments your copier, printer or scanner.
Present service manual contain clear instructions and procedures on how to fix the problems occurring in your equipment.
The information contained in this repair manual is necessary for the repair, but also prevention, resulting in a longer life of your equipment.
Format of the manual: PDF, makes it easy to navigate, instant download and print. English language.
To see what contain, please read table of contents:

Content for REPAIR MANUAL:
Removal and replacement strategy
Considerations during removal and replacement
Electrostatic discharge
Required tools
Accessing the 2ndary service menu
Fasteners used in this product
Service approach
Before performing service
After performing service
Post-service tests
Print-quality test
Copy quality test
Fax quality test (fax models only)
Removal and replacement procedures
Rollers and pads
Transfer roller
Pickup roller (Tray 2 or Tray 3)
Separation roller (Trays 2 or 3)
Reinstall the separation roller
Document feeder pickup roller assembly
Pickup roller and separation pad (Tray 1)
Scanner and document feeder
Scanner assembly
Document feeder
Remove the scanner cable cover
Remove the document feeder
Reinstall the document feeder
Covers and doors
Print-cartridge drawer
Right cover
Right-front cover and power button
Rear-upper cover
Paper-feed guide assembly
Rear door
Rear-lower cover and rear-door links
Remove the rear-lower cover and rear-door links
Rear-door rib assembly
Remove the rear-door rib assembly
Control panel and right-arm mount
Reinstall the control panel and right-arm mount
Upper-cover assembly
Remove the upper-cover assembly
Reinstall the upper-cover assembly
Left cover
Remove the left cover
Reinstall the left cover
Front-door assembly
Remove the front-door assembly
Internal assemblies
Intermediate transfer belt (ITB)
Reinstall the ITB
Drum motor (M1) and developer motor (M2)
Reinstall the drum motor (M1) and developer motor (M2)
Intermediate PCA
Formatter PCA
Remove the formatter PCA
Wireless PCA
DC controller PCA
Remove the DC controller PCA
Fuser-motor assembly
Remove the fuser-motor assembly
Reinstall the fuser-motor assembly
High-voltage power-supply PCA
Remove the high-voltage power-supply PCA
Color-misregistration sensor assembly
Remove the color-misregistration sensor assembly
Reinstall the color-misregistration sensor assembly
Fan (FM1)
USB PCA (fax/memory-card models)
Remove the USB PCA
Duplex-reverse drive assembly
Remove the duplex-reverse drive assembly
Remove the fuser
Reinstall the fuser
Paper-delivery assembly
Remove the paper-delivery assembly
Low voltage power supply
Tray cassettes and optional Tray 3 assembly

Order parts, accessories, and supplies
Orderable parts
Toner cartridges
Customer self repair (CSR) and service kits
Whole unit replacement (WUR)
Service parts
Related documentation and software
How to use the parts lists and diagrams
Scanner and document feeder main assembly
Internal assemblies
Internal assemblies (1 of 7)
Internal assemblies (2 of 7)
Internal assemblies (3 of 7)
Internal assemblies (4 of 7)
Internal assemblies (5 of 7)
Internal assemblies (6 of 7)
Internal assemblies (7 of 7)
250-sheet paper feeder accessory kit (optional Tray 3)
Alphabetical parts list
Numerical parts list


Basic operation
Major systems
Product components
Sequence of operation
Formatter-control system
Sleep Delay
10/100 networking
USB hosts
Flash memory
Random access memory
Nonvolatile memory
Memory Enhancement technology
Wireless radio
PJL overview
LEDM overview
ACL overview
Control panel
Engine control system
DC controller
Power supply
Protective function
Power saving
Fuser control
Fuser control circuit
Fuser protective function
Fuser failure detection
High-voltage power supply
Laser/scanner system
Laser failure detection
Image-formation system
Image-formation process
Latent-image formation stage
Step 1: primary charging
Step 2: laser-beam exposure
Developing stage
Step 3: development
Transfer stage
Step 4: primary transfer
Step 5: secondary transfer
Step 6: separation from the drum
Fusing stage
Step 7: fusing
ITB cleaning stage
Step 8: ITB cleaning
Drum cleaning stage
Step 9: drum cleaning
Developing roller engagement/disengagement control
Pickup-and-feed system
Jam detection
Pad transfer
Multiple-feed prevention
Scanning and image capture system
Scanner power-on sequence of events
Copy or scan sequence of events
Scanner operation
ADF operation
ADF duplex operation
ADF paper path and ADF sensors
ADF jam detection
ADF jam clearance
Fax functions and operation
Computer and network security features
PSTN operation
Receive faxes when you hear fax tones
Distinctive ring function
Fax by using Voice over IP services
The fax subsystem
Fax card in the fax subsystem
Safety isolation
Safety-protection circuitry
Data path
Hook state
Downstream current detection
Hook switch control
Ring detect
Line current control
Billing- (metering-) tone filters
Fax page storage in flash memory
Stored fax pages
Advantages of flash memory storage
USB flash drive

Solve problems checklist
Menu structure
Configuration report
Troubleshooting process
Determine the problem source
Power subsystem
Power-on checks
Control-panel checks
Tools for troubleshooting
Individual component diagnostics
Tools for troubleshooting: LED diagnostics
Network LEDs
Control panel LEDs
Tools for troubleshooting: Engine diagnostics
Engine-test button
Drum rotational check
Half self-test functional check
Diagrams: Formatter connections
Diagrams: Location of major components
Major components
Motors and fans
Optional 250-sheet cassette
Diagrams: General timing chart
Diagrams: Circuit diagram
Diagrams: CPU/ASIC diagrams
Diagrams: HVT/Toner EMP diagram
Diagrams: Driver PCA diagram
Diagrams: Duplexer PCA diagram
Diagrams: FSR diagram
Print-quality troubleshooting tools
Print-quality troubleshooting tools: Repetitive defects ruler
Tools for troubleshooting: Control panel menus
Setup menu
HP Web Services menu
Reports menu
Self Diagnostics menu
Fax Setup menu
System Setup menu
Service menu
Network Setup menu
Quick Forms menu
Fax Menu
Copy Menu
Tools for troubleshooting: Interpret control panel messages
Control panel message types
Control panel messages
10.100X Supply Memory Error
30.XXXX Scanner Error
49 Error, Turn off then on
50.XXXX Fuser Error
51.XX and 52.XX Error To continue turn off then on
54.0100 – 54.1599 Error
55.1 DC controller Memory Error
57 Fan Error, Turn off then on
58.04 Error Turn off then on
59.XXXX Error Turn off then on
60.XXXX Error Turn off then on
79 Error Turn off then on
Device is busy. Try again later
Document feeder mispick. Reload
Document feeder jam. Clear and reload
Fax is busy. Canceled send
Fax receive error
Fax Send error
Fax storage is full. Canceling the fax send/receive
Front door open
Jam in Tray 1, Clear jam and then press OK
Jam in Tray 2, Clear jam and then press OK
Jam in Tray 3, Clear jam and then press OK
Load paper
Load Tray 1, Press OK to use available media
Load Tray 1, / Cleaning mode, OK to start
Load tray Press [OK] for available media
No dial tone
No fax detected
The product is unable to calibrate. Close the lid and remove paper from the document feeder
Unexpected size in tray # Load Press [OK]
Tools for troubleshooting: Event-log messages
Print the event log
Event log messages
Clear jams
Jam locations
Experiencing frequent or recurring paper jams?
Clear jams in the document feeder
Clear jams in Tray 1
Clear jams in Tray 2
Clear jams in Tray 3 (accessory)
Clear jams in the duplexer
Clear jams in the output bin
Paper feeds incorrectly or becomes jammed
The product does not pick up paper
The product picks up multiple sheets of paper
Solve image-quality problems
Solve image quality problems: Image defects table
Improve print quality
Print from a different software program
Check the paper-type setting for the print job
Check the paper type setting (Windows)
Check the paper type setting (Mac OS X)
Check toner-cartridge status
Print and interpret the print quality page
Clean the product
Print a cleaning page
Check the scanner glass for dirt and smudges
Visually inspect the toner cartridge
Check paper and the printing environment
Step one: Use paper that meets HP specifications
Step two: Check the environment
Calibrate the product to align the colors
Check other print job settings
Check the EconoMode settings
Adjust color settings (Windows)
Try a different print driver
General print-quality issues
Solve paper-handling problems
Product feeds incorrect page size
Product pulls from incorrect tray
Paper does not feed automatically
Paper does not feed from Tray 2 or 3
Product will not duplex or duplexes incorrectly
Clean the product
Clean the pickup and separation rollers
Clean the paper path
Clean the scanner glass strip and platen
Clean the document feeder pickup rollers and separation pad
Clean the touchscreen
Solve performance problems
Factors affecting print performance
Print speeds
The product does not print or it prints slowly
The product does not print
The product prints slowly
Solve connectivity problems
Solve USB connection problems
Solve wired network problems
Poor physical connection
The computer is using the incorrect IP address for the product
The computer is unable to communicate with the product
The product is using incorrect link and duplex settings for the network
New software programs might be causing compatibility problems
The computer or workstation might be set up incorrectly
The product is disabled, or other network settings are incorrect
Solve wireless network problems
Wireless connectivity checklist
The product does not print after the wireless configuration completes
The product does not print, and the computer has a third-party firewall installed
The wireless connection does not work after moving the wireless router or product
Cannot connect more computers to the wireless product
The wireless product loses communication when connected to a VPN
The network does not appear in the wireless networks list
The wireless network is not functioning
Perform a wireless network diagnostic test
Reduce interference on a wireless network
Solve fax problems
Checklist for solving fax problems
Perform a fax diagnostic test
Solve general fax problems
Faxes are sending slowly
Fax quality is poor
Fax cuts off or prints on two pages
Solve problems receiving faxes
The fax does not respond
The fax has a dedicated phone line
An answering machine is connected to the product
The Answer Mode setting is set to the Manual setting
Voice mail is available on the fax line
The product is connected to a DSL phone service
The product uses a fax over IP or VoIP phone service
An error message displays on the control panel
The No Fax Detected message displays
The Communication Error message appears
The Fax storage is full. message appears
The Fax is busy. message appears
A fax is received but does not print
The Private Receive feature is on
Sender receives a busy signal
A handset is connected to the product
A phone line splitter is being used
No dial tone
Cannot send or receive a fax on a PBX line
Solve problems sending faxes
An error message displays on the control panel
The Communication Error message appears
No dial tone
The Fax is busy. message appears
The No fax answer. message appears
Document feeder paper jam
The Fax storage is full. message appears
Scanner error
The control panel displays a Ready message with no attempt to send the fax
The control panel displays the message “Storing page 1” and does not progress beyond that message
Faxes can be received, but not sent
Product is password protected
Unable to use fax functions from the control panel
Unable to use speed dials
Unable to use group dials
Receive a recorded error message from the phone company when trying to send a fax
Unable to send a fax when a phone is connected to the product
Fax trace report
Fax error report printing
Print all fax reports
Print individual fax reports
Set the fax error report
Set the fax-error-correction mode
Change the fax speed
Solve email problems
Cannot connect to the email server
The email failed
Unable to scan
Validate LDAP gateway
Access control for LaserJet Pro devices
Product resets
Restore the factory-set defaults
NVRAM initialization
Super NVRAM initialization
Firmware upgrades

Appendix A: Product specifications
Product dimensions
Power consumption, electrical specifications, and acoustic emissions
Environmental specifications
Certificate of Volatility

Number of pages: 325.