HP Laserjet Pro Mfp M521 Full: Troubleshooting Repair Parts Catalog PDF Download

Troubleshooting Manual & Repair Manual & Parts List HP LaserJet PRO MFP M521;
This service manual, is the full HP LaserJet PRO MFP M521 Service Repair Manual.
This manual, HP LaserJet PRO MFP M521, is in the PDF format and have detailed Diagrams, pictures and full procedures to diagnose and repair your HP LaserJet PRO MFP M521 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 PRO MFP M521 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
Basic operation
Major systems
Product block diagram
Sequence of operation
Normal sequence of operation
Formatter-control system
Auto on/Auto off mode
Input/output
CPU
Memory
Firmware
Nonvolatile memory
Control panel
Engine-control system
Motors, fans, clutches, solenoids, switches, and sensors
DC controller operations
Fuser-control circuit
Fuser failure detection
Fuser temperature control
Fuser protective function
Low-voltage power supply
Overcurrent/overvoltage protection
High-voltage power supply
Laser/scanner system
Laser failure detection
Image-formation system
Electrophotographic process
Image formation process
Latent-image formation stage
Primary charging
Laser beam exposure
Developing stage
Toner cartridge
Transfer stage
Fusing stage
Cleaning stage
Toner detection
Pickup, feed, and delivery system
Paper trays
Photo sensors and switches
Solenoids and clutches
Tray 1 or Tray 2
Pickup and feed unit
Cassette paper size detection/cassette paper detection
Cassette pickup
Tray 1 paper pickup
Paper pickup and feed
Jam detection
Additional tray
Tray driver PCA
Paper pickup and feed
Paper level and size detection
Jam detection
Scanner system
Scanner power-on sequence of events
Copy or scan sequence of events

2. SOLVE PROBLEMS
Solve problems checklist
Menu map
Troubleshooting process
Pre-troubleshooting checklist
Determine the problem source
Troubleshooting flowchart
Power subsystem
Power-on checks
Power-on troubleshooting overview
Control-panel checks
Tools for troubleshooting
Diagrams
Block diagrams
Location of connectors
DC controller connections
Formatter connections
Plug and port locations
Locations of major assemblies
General timing charts
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 defects ruler
Control-panel menus
Setup Menu
HP Web Services
Reports menu
Self Diagnostics menu
Fax Setup menu
System Setup menu
Service menu
Network Setup menu
Quick Forms menu
Function specific menus
USB Flash Drive
Fax Menu
Copy Menu
Scan Menu
Apps
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
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
Install cartridge
Invalid driver Press OK
Jam in Tray 1, Clear jam and then press OK
Load tray 1 Press OK for available media
Load Tray 1 , Press OK to use available media
Load Tray 1, / Cleaning mode, OK to start
Load Tray : [Type], [Size]
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
Remove shipping lock from cartridge
Replace
Unexpected size in tray 1 Load Press OK
Unsupported Press OK to continue
Used 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 in the document feeder
Clear jams in the output area
Clear jams in Tray 1
Clear jams in Tray 2 or optional Tray 3
Clear jams in the fuser
Clear jams in the duplexer
Paper feeds incorrectly or becomes jammed
The product does not pick up paper
The product picks up multiple sheets of paper
The document feeder jams, skews, or picks up multiple sheets of paper
Prevent paper jams from the paper trays
Solve image-quality problems
Image defect 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
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
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
Checklist for solving fax problems
Perform a fax diagnostic test
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 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