HP Color LaserJet Pro MFP M377 Pro M452 Pro MFP M477 Service Manual and Parts List Manual


This Service Manual contain: Repair Manual and Troubleshooting Manual HP Color LaserJet Pro M452nw Pro M452dn Pro M452dw HP Color LaserJet Pro MFP M477dw Pro MFP M477fnw Pro MFP M477fdw.

Content for REPAIR MANUAL:
1. REMOVAL AND REPLACEMENT
For additional service and support
Removal and replacement strategy
Introduction
Considerations during removal and replacement
Electrostatic discharge
Required tools
Fasteners used in this printer
Service approach
Before performing service
Secondary service menu
After performing service
Post service tests
Print-quality test
Copy-quality test (M377, M477 models)
Fax-quality test (M477 models)
Order parts by authorized service providers
Orderable parts
Whole unit replacement (WUR) part numbers
Supplies part numbers
Related documentation and software
Removal and replacement procedures
Customer self-repair (CSR) A parts and assemblies
Removal and replacement: Toner cartridges
Removal and replacement: Trays
Removal and replacement: Tray 2
Removal and replacement: Tray 3
Field replaceable units (FRUs)
Removal and replacement: Rollers
Removal and replacement: Tray 1 pickup roller
Removal and replacement: Tray 1 separation pad
Removal and replacement: Tray 2 pickup and feed rollers
Removal and replacement: Tray 2 separation roller
Removal and replacement: Tray 3 pickup and feed rollers
Removal and replacement: Tray 3 separation roller
Removal and replacement: Secondary transfer roller
Removal and replacement: External panels, covers, and doors
Removal and replacement: Right cover (M452 models)
Removal and replacement: Left cover (M452 models)
Removal and replacement: Right cover (M377, M477 models)
Removal and replacement: Left cover (M377, M477 models)
Removal and replacement: Front door assembly
Removal and replacement: Duplexer door assembly (duplex models)
Removal and replacement: Rear top cover (simplex models)
Removal and replacement: Rear lower cover (simplex models)
Removal and replacement: Rear door (simplex models)
Removal and replacement: Top cover (M452 models)
Removal and replacement: Top cover (M377, M477 models)
Removal and replacement: Touchscreen control panel (M452dw
model)
Removal and replacement: Touchscreen control panel (M377, M477
models)
Removal and replacement: Integrated scanner assembly (M377, M477 models)
Introduction
Step 1: Remove Tray 2
Step 2: Open the front door and rear door or duplexer door
Step 3: Remove the left cover (M377, M477 models)
Step 4: Remove the integrated scanner assembly
Step 5: Unpack the replacement part
Step 6: Install the integrated scanner assembly
Step 7: Install the left cover (M377, M477 models)
Step 8: Close the front door and rear door or duplexer door
Step 9: Install Tray 2
Removal and replacement: Internal parts and assemblies
Removal and replacement: Power switch assembly
Removal and replacement: Toner cartridge tray
Removal and replacement: Cartridge fan
Removal and replacement: Power supply fan
Removal and replacement: Low-voltage power supply (LVPS)
Removal and replacement: Pickup motor
Removal and replacement: Driver PCA
Removal and replacement: Drum motor
Removal and replacement: Developer motor
viii ENWW
Removal and replacement: Secondary transfer assembly (simplex
models)
Removal and replacement: Secondary transfer assembly (duplex
models)
Removal and replacement: Intermediate transfer belt (ITB)
Removal and replacement: Registration density sensor
Removal and replacement: Re-pickup assembly (duplex models)
Removal and replacement: Engine controller PCA
Removal and replacement: Lifter drive assembly
Removal and replacement: Pickup assembly
Removal and replacement: Front feed guide assembly
Removal and replacement: Rear feed guide assembly
Removal and replacement: Registration assembly
Removal and replacement: Memory PCA
Removal and replacement: Laser scanner (M452 models)
Removal and replacement: Laser scanner ( M377, M477 models)
Removal and replacement: Fuser (simplex models)
Removal and replacement: Fuser (duplex models)
Removal and replacement: Fuser power supply
Removal and replacement: Fuser motor
Removal and replacement: Duplex drive assembly (duplex models)
Removal and replacement: Wireless antenna (M452nw/dw models)
Removal and replacement: Wireless PCA (M452nw/dw models)
Removal and replacement: Wireless PCA (M377, M477fnw/fdw
models)
Removal and replacement: Formatter PCA
Removal and replacement: Environmental sensor
Removal and replacement: Fax PCA (M477 models)
Removal and replacement: NFC PCA (M452dw and M477dw models)
Removal and replacement: Walk-up USB port (M452dw model)
Removal and replacement: Walk-up USB port (M377, M477 models)
Removal and replacement: Drawer connector
Removal and replacement: Accessories
550-sheet paper feeder

2. PARTS AND DIAGRAMS
For additional service and support
Assembly locations
Base printer, M452
Base printer, M377 and M477
550-sheet paper feeder (all models)
Order parts, accessories, and supplies
Ordering
Orderable parts
Supplies
Accessories
Customer self-repair kits
Related documentation and software
How to use the parts lists and diagrams
Parts and diagrams: Document feeder and scanner whole units
Document feeder and scanner (M377, M477)
Parts and diagrams: Covers and control panels
M452 covers and control panels
M377, M477 covers and control panel
Parts and diagrams: Internal components
Internal components (1 of 5)
Internal components (2 of 5)
Internal components (3 of 5)
Internal components (4 of 5)
Internal components (5 of 5)
Parts and diagrams: 550-sheet paper feeder
550-sheet paper feeder covers
550-sheet paper feeder main body (1 of 2)
550-sheet paper feeder main body (2 of 2)
Alphabetical parts list
Numerical parts list
Index

———————–

Content for TROUBLESHOOTING MANUAL:
1. THEORY OF OPERATION
For additional service and support
Basic operation
Sequence of operation
Formatter-control system
Sleep delay
Auto On / Auto Off mode
Printer job language (PJL)
Printer management language (PML)
Control panel
Walk-up USB
Wireless
Low end data model (LEDM) overview
Advanced control language (ACL) overview
NFC
CPU
Input/output (I/O)
USB
USB hosts
10/100/1000 networking
Fax
Memory
Firmware
Nonvolatile random access memory (NVRAM)
Flash memory
Random access memory
HP Memory Enhancement technology (MEt)
Engine-control system
Engine-control unit
DC controller
High-voltage power supply
Motors
Fans
Low-voltage power supply
Over-current/over-voltage protection
Fuser control
Fuser heater protection
DC controller
Fuser heater safety circuit
Temperature fuse
Fuser control functions
Engine laser/scanner system
Laser/scanner failure detection
Image-formation system
Image-formation process
Step 1: Primary charging
Step 2: Laser-beam exposure
Step 3: Development
Step 4: Primary transfer
Step 5: Secondary transfer
Step 6: Separation
Step 7: Fusing
Step 8: Drum cleaning
Toner cartridges
Design
HP Cartridges with JetIntelligence
HP Cartridge Policy
Anti-theft or cartridge protection
Memory chip
Toner seal
Toner cartridge life detection
Developing unit engagement and disengagement control
Intermediate transfer belt (ITB) unit
Secondary transfer roller functions
Color self calibration
Engine pickup, feed, and delivery system
Photo sensors and switches
Motors, clutches, and solenoids
Feed speed control
Pickup and feed delivery features
Tray 1 (multipurpose)/Tray 2 (base printer)
Duplexing unit
Duplexing reverse and duplex feed control
viii ENWW
Duplex pickup operation
Jam detection/prevention
Input accessories
Tray 3
Tray 3 paper feeder controller
Tray 3 motor control
Tray 3 paper pickup
Tray 3 pickup and feed functions
Tray 3 jam detection
Scanning and image capture system
Document feeder system
Document feeder simplex operation
Fax functions and operation (fax models only)
Computer and network security features
PSTN operation
Receive faxes when you hear fax tones
Distinctive ring function
Set up the distinctive ring function
Fax by using voice over IP (VOIP) services
The fax subsystem
Fax card in the fax subsystem
Safety isolation
Safety-protection circuitry
Data path
Hook state
Downstream device detection
Hook switch control
Ring detect
Line current control
Billing or metering tone filters
Fax page storage in flash memory
Stored fax pages
Advantages of flash memory storage

2. SOLVE PROBLEMS
For additional service and support
Troubleshooting process
Solve problems checklist
Print the menu map
Print a configuration page
Print the service page (includes the event log)
Determine the problem source
Pre-troubleshooting checklist
Troubleshooting flowchart
Power subsystem
Power-on checks
Power-on troubleshooting overview
Control panel checks
Tools for troubleshooting
Individual component diagnostics
Tools for troubleshooting: LED diagnostics
Network port LEDs
Two-line control panel LEDs
Tools for troubleshooting: Engine diagnostics
Engine test
Diagrams
Diagrams: Block diagrams
Sensors and switches (printer base)
Diagrams: Printed circuit assembly (PCA) connector locations
Diagrams: Formatter connections
Diagrams: Engine controller PCA connections
Diagrams: 550-sheet paper feeder controller PCA connections
Diagrams: External plug and port locations
Diagrams: Locations of major components
Major components (printer base)
Motors (printer base)
Fans (printer base)
Rollers and power switch (printer base)
PCAs (printer base)
Major components (550-sheet paper feeder)
PCA (550-sheet paper feeder)
Motors and rollers (550-sheet paper feeder)
Diagrams: Timing chart
Diagrams: Circuit diagrams
Advanced configuration with HP Embedded Web Server (EWS) and HP Device Toolbox (Windows)
Control panel menus
2-line control-panel view (M452nw and M452dn models)
Touchscreen control-panel view (M452dw model)
Home screen layout
Touchscreen control-panel view (M477 models)
Home screen layout
Setup menu
HP Web Services menu
Reports menu
Self Diagnostics menu
Fax Setup menu (M477 models)
System Setup menu
Service menu
Network Setup menu
Quick Forms menu
Function specific menus
USB menu
Fax Menu (M477 models only)
Copy menu (M477 models only)
Scan menu (M477 models only)
Apps
Jobs
Supplies Status
Control panel message document (CPMD)
Control-panel message types
Control-panel messages and event log entries
30.XX Error Messages
49.XX.YY Error Messages
50.XX fuser errors
51.XX and 52 Laser/Scanner Errors
54.XX Error Messages
55.XXXX Error Messages
57.XX Error Messages
58.XX Error Messages
59.XX Error Messages
79 Errors
Alpha Error Messages
Tools for troubleshooting: Event log messages
Print an error log
View the event log
Event-log messages
Solve image quality problems
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 printer
Print a cleaning page
Clean the scanner glass strip and platen
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 printer to align the colors
Check other print job settings
Check the EconoMode settings
Adjust color settings (Windows)
Try a different print driver
Print quality troubleshooting guide
Repetitive defects ruler
Use a ruler to measure between repetitive defects
Clean the printer
Print a cleaning page
Clean the scanner glass strip and platen
Clean the pickup and separation rollers
Clean the pickup rollers and separation pad in the document feeder
Clean the touchscreen
Solve paper-handling problems
Printer feeds incorrect page size
Printer pulls from incorrect tray
Printer will not duplex or duplexes incorrectly
Paper does not feed from Tray 2
Output is curled or wrinkled
Printer does not pick up paper or misfeeds
The printer does not pick up paper
The printer picks up multiple sheets of paper
The document feeder jams, skews, or picks up multiple sheets of paper (M477 models)
Paper does not feed automatically
Prevent paper jams
Clear paper jams
Introduction
Experiencing frequent or recurring paper jams?
Paper jam locations
Clear paper jams in the document feeder (M477 models only)
Clear paper jams in Tray 1
Clear paper jams in Tray 2
Clear paper jams in the rear door and the fuser area (simplex models)
Clear paper jams in the output bin
Clear paper jams in the duplexer (duplex models)
Solve performance problems
Solve connectivity problems
Solve USB connection problems
Solve wired network problems
Introduction
Poor physical connection
The computer is using the incorrect IP address for the printer
The computer is unable to communicate with the printer
The printer 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 printer is disabled, or other network settings are incorrect
Solve wireless network problems
Introduction
Wireless connectivity checklist
The printer does not print after the wireless configuration completes
The printer does not print, and the computer has a third-party firewall installed
The wireless connection does not work after moving the wireless router or printer
Cannot connect more computers to the wireless printer
The wireless printer 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
Service mode functions
Service menu
Secondary service menu
Printer resets
Restore the factory-set defaults
NVRAM initialization
Super NVRAM initialization
Solve fax problems (fax models only)
Checklist for solving fax problems
Perform a fax diagnostic test
Solve general fax problems
Faxes are sending slowly
Print quality of a photo is poor or prints as a gray box
Fax quality is poor
You touched the Cancel button to cancel a fax, but the fax was still sent
No fax address book button displays
Not able to locate the fax settings in HP Web Jetadmin
The header is appended to the top of the page when the overlay option is enabled
A mix of names and numbers is in the recipients box
A one-page fax prints as two pages
A document stops in the document feeder in the middle of faxing
The volume for sounds coming from the fax accessory is too high or too low
Use fax over VoIP networks
Solve problems receiving faxes
Solve problems sending faxes
Fax error messages on the control panel
The No Fax Detected message displays
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
Printer 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 printer
Troubleshoot fax codes and trace reports
View and interpret fax error codes
Fax trace report
Fax logs and reports
Print all fax reports
Print individual fax reports
Set the fax error report
Set the fax-error-correction mode
Change the fax speed
Use fax on a DSL, PBX, or ISDN system
DSL
PBX
ISDN
Solve email problems
Cannot connect to the email server
Validate the SMTP gateway (Windows)
Validate the LDAP gateway (Windows)
Update the firmware
Method one: Update the firmware using the control panel
Method two: Update the firmware using the Firmware Update Utility

Appendix A: Certificates of volatility
Certificates of volatility

Index

Total number pages: 3440.