Present Service Manual contain: Repair Manual and Troubleshooting Manual HP LaserJet Pro 400 MFP M425;
This manual is in the PDF format and have detailed Diagrams, pictures and full procedures to diagnose and repair your HP LaserJet Pro.
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 Pro 400 MFP M425 photocopier. You can find easily everything what do you need.
To see what contain, please read table of contents:

Hp Laserjet Pro 400 Mfp M425dn User Manual

Content for TROUBLESHOOTING MANUAL:
SOLVE PROBLEMS
Solve problems checklist
Menu map
Troubleshooting process
Pre-troubleshooting checklist
Determine the problem source
Power subsystem
Power-on checks
Control-panel checks
Tools for troubleshooting
Component diagnostics
LED diagnostics
Network LEDs
Control panel LEDs
Engine diagnostics
Engine test
Diagrams
Plug/jack locations
Locations of major components
General timing chart
General circuit diagrams
Use HP Device Toolbox (Windows)
Internal print-quality test pages
Clean the paper path
Print the configuration page
Print-quality troubleshooting tools
Repetitive image defect ruler
Control panel menus
HP Web Services menu
Reports menu
Quick Forms menu
USB Flash Drive menu
System Setup menu
Service menu
Network Setup menu
Interpret control-panel messages
Control panel message types
Control panel messages
49 Error, Turn off then on
50.x Fuser Error
51.XX Error
54.XX Error
55.X Error
57 Fan Error, Turn off then on
59.X Error
79 Error Turn off then on
79 Service error
Black cartridge low
Black cartridge very low
Cleaning
Communication error
Device error, press OK
Document feeder door is open. Canceled fax
Door open
Fax is busy. Canceled send
Fax is busy. Redial pending
Fax receive error
Fax Send error
Fax storage is full. Canceling the fax receive
Fax storage is full. Canceling the fax receive
Fax storage is full. Canceling the fax send
Genuine HP supply installed
Incompatible black
Install black cartridge
Invalid driver Press [OK]
Jam in Tray 1, Clear jam and then press OK
Load Tray 1 , Press OK to use available media
Load Tray 1, / Cleaning mode, OK to start
Load tray Press [OK] for available media
Load tray
Manual Duplex Load Tray 1, Press OK
Manual feed , Press OK to use available media
Memory is low. Press OK
Misprint, Press OK
No dial tone
No fax answer. Canceled send
No fax answer. Redial pending
No fax detected
Print failure, press OK. If error repeats, turn off then on
Rear door open
Remove shipping material from toner cartridge
Replace black cartridge
Unexpected size in tray Load Press [OK]
Unsupported black cartridge Press [OK] to continue
Used black cartridge is installed Press [OK] to continue
Event-log messages
Print the event log
Show an event log
Event log messages
Clear jams
Jam locations
Clear jams from the document feeder
Clear a jam in Tray 1
Clear a jam in Tray 2
Clear a jam in optional Tray 3
Clear jams from the output bin
Clear a jam in the duplexer area
Clear a jam in the fuser area
Solve paper-handling problems
The product picks up multiple sheets of paper
The product does not pick up paper
Solve image quality problems
Print quality examples
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 direct-connect problems
Solve 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 control panel displays the message: The wireless feature on this product has been turned off
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
Service mode functions
Service menu
Service menu settings
Restore the factory-set defaults
Secondary service menu
Open the secondary service menu
Secondary service menu structure
Product resets
NVRAM initialization
Super NVRAM initialization
Solve fax problems
Fax troubleshooting checklist
Solve problems receiving faxes
The fax does not respond
The fax has a dedicated phone line
An answering machine is connected to the product
A telephone handset 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 displays
The Fax storage is full. message displays
The Fax is busy. message displays
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
Fax cuts off or prints on two pages
Solve problems sending faxes
An error message displays on the control panel
The Communication error. message displays
No dial tone
The Fax is busy. message displays
The No fax answer. message displays
Document feeder paper jam
The Fax storage is full. message displays
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
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
Solve fax performance problems
Faxes are sending slowly
Fax quality is poor
Solve DSL problems
Cannot send or receive a fax on a PBX line
Manually update the firmware

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THEORY OF OPERATION
Basic operation
Major product systems
Product components
Sequence of operation
Engine control system
DC controller
Motor control
Fan control
High-voltage power supply
Fuser control circuit
Fuser temperature control
Fuser protection function
Fuser failure detection
Low-voltage power supply
Protective function
Safety
Low-voltage power supply unit failure detection
Laser scanner system
Laser failure detection
Ima

Laserjet Pro 400 Mfp M425dn User Manual