HP ColorLaserJet Pro M252n Pro M252dw Pro M274MFP Pro M277MFP Service Manual and Parts List Manual

Present Service Manual contain: Repair Manual and Troubleshooting Manual HP ColorLaserJet Pro M252n Pro M252dw Pro M274MFP Pro M277MFP;
This manual is in the PDF format and have detailed Diagrams, pictures and full procedures to diagnose and repair your HP copier.
You can print, zoom or read any diagram, picture or page from this Service Manual and Parts List 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 ColorLaserJet Pro photocopier. You can find easily everything what do you need.
To see what contain, please read table of contents:

Content for TROUBLESHOOTING MANUAL:
1) THEORY OF OPERATION
Related documentation and software
Basic operation
Sequence of operation
Formatter-control system
Sleep delay
Printer job language (PJL)
Printer management language (PML)
Control panel
Walk-up USB (touchscreen models only)
Wireless (wireless models only)
Low end data model (LEDM)
Advanced control language (ACL) overview
Near field communication (NFC) (wireless models only)
CPU
Input/output
USB
USB hosts
10/100 networking
Fax (M277 models only)
Memory
Firmware
Nonvolatile random access memory (NVRAM)
Flash memory
Random access memory (RAM)
HP Memory enhancement technology (MEt)
Engine-control system
Engine control unit (ECU)
DC controller
High-voltage power supply
Motors
Fans
Solenoids
Switches
Sensors
Low-voltage power supply
Overcurrent/overvoltage protection
Low-voltage power supply unit failure detection
Engine laser scanner system
Laser 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
Memory chip
HP Cartridges with JetIntelligence
HP Cartridge Policy
Anti-theft or cartridge protection
Intermediate transfer belt (ITB) assembly
Engine pickup, feed, and delivery system
Priority input slot pickup
Cassette pickup
Duplexing unit
Duplex reverse and duplex feed control
Duplex pickup operation
Jam detection
Scanning and image capture system
Automatic document feeder (ADF) system
ADF 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
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
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
Diagrams: Printed circuit assembly (PCA) connector locations
Diagrams: Formatter connections
Diagrams: DC controller connections
Diagrams: External plug and port locations
Diagrams: Locations of major components
Major components (printer base)
Motors and fan
Rollers (printer base)
PCAs (printer base)
Diagrams: Timing chart
Diagrams: Circuit diagrams
Advanced configuration with HP Embedded Web Server (EWS) and HP Device Toolbox (Windows)
Print quality troubleshooting tools
Repetitive defects ruler
Use a ruler to measure between repetitive defects
Calibrate the printer to align the colors
Control panel menus
2-line control-panel view (M252n model)
Touchscreen control-panel view (M252dw model)
Home screen layout
Touchscreen control-panel view (M274 and M277 models)
Home screen layout
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
Function specific menus
USB menu
Fax Menu (M277 models only)
Copy menu (M274 and M277 models only)
Scan menu (M274 and M277 models only)
Apps
Control panel message document (CPMD)
Control-panel message types
Control-panel messages and event log entries
Alpha 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
Tools for troubleshooting: Event log messages
Print an event log
View the event log
Event-log messages
Solve image quality problems
Improve print quality
Repetitive defects ruler
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
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 (M274 and M277 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 (M274 and M277 models only)
Clear paper jams in the single-sheet slot (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
Certificate of volatility
Index

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Content for REPAIR MANUAL:
1) REMOVAL AND REPLACEMENT
Related documentation and software
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 (M274 and M277 models)
Fax-quality test (M277 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
Introduction
Step 1: Remove a toner cartridge
Step 2: Unpack a replacement toner cartridge
Step 3: Install a toner cartridge
Removal and replacement: Priority feed slot tray
Introduction
Step 1: Remove Tray 2
Step 2: Remove the priority feed slot tray
Step 3: Unpack a replacement priority feed slot tray
Step 4: Install the priority feed slot tray
Step 5: Install Tray 2
Removal and replacement: Tray 2
Introduction
Step 1: Remove Tray 2
Step 2: Unpack a replacement Tray 2
Step 3: Install Tray 2
Field replaceable units (FRUs)
Removal and replacement: Rollers
Removal and replacement: Tray 2 pickup roller and feed roller
Removal and replacement: Tray 2 separation roller
Removal and replacement: Secondary transfer roller
Removal and replacement: External panels, covers, and doors
Identification and location (printer base)
Removal and replacement: Right cover
Removal and replacement: Left cover
Removal and replacement: Top cover, M252n models
Removal and replacement: Top cover, M252dw models
Removal and replacement: Top cover, M274, M277 models
Removal and replacement: Duplexer door assembly (duplex models)
Removal and replacement: Rear cover (simplex models)
Removal and replacement: Rear door and rear door assembly (simplex models)
Removal and replacement: Rear bottom cover (simplex models)
Removal and replacement: Touchscreen control panel (M252dw models)
Removal and replacement: Touchscreen control panel (M274, M277 models)
Removal and replacement: Front-door assembly
Removal and replacement: Rear door assembly (duplex models)
Removal and replacement: Scanner (M274, M277 only)
Removal and replacement: Scanner
Removal and replacement: Internal parts and assemblies
Removal and replacement: Priority feed slot assembly
Removal and replacement: Wireless PCA (M252dw models)
Removal and replacement: Wireless PCA (M277dw models)
Removal and replacement: Fax PCA (fax models)
Removal and replacement: Formatter PCA (M252 models)
Removal and replacement: Formatter PCA (M274, M277 models)
Removal and replacement: Engine controller unit (M252 models)
Removal and replacement: Engine controller unit (M274, M277 models)
Removal and replacement: Intermediate transfer belt (ITB)
Removal and replacement: Pickup guide assembly
Removal and replacement: Registration density sensor assembly
Removal and replacement: Duplex drive assembly (duplex models)
Removal and replacement: Output sensor assembly (duplex models)
Removal and replacement: Power switch assembly
Removal and replacement: Low-voltage power supply (LVPS)
Removal and replacement: Fuser
Removal and replacement: Main motor
Removal and replacement: Fuser motor
Removal and replacement: Main fan

2) PARTS AND DIAGRAMS
Related documentation and software
Assembly locations
Introduction
M252 assembly locations
M274, M277 assembly locations
Parts and diagrams: Document feeder and scanner whole units
Parts and diagrams: Covers and control panels
M252 covers and control panels
M274, M277 covers and control panel
Parts and diagrams: Internal components
Internal components (1 of 3)
Internal components (2 of 3)
Internal components (3 of 3)
Alphabetical parts list
Numerical parts list
Index

Number of pages: 742.