HP LaserJet Pro MFP M521 Repair Manual - ENWW

HP LaserJet Pro MFP M521 Repair Manual - ENWW
LASERJET PRO MFP
Repair Manual
2
M521
HP LaserJet Pro MFP M521 Printer
Repair Manual
Copyright and License
Trademark Credits
© 2012 Copyright Hewlett-Packard
Development Company, L.P.
Adobe®, Acrobat®, and PostScript® are
trademarks of Adobe Systems Incorporated.
Reproduction, adaptation, or translation
without prior written permission is
prohibited, except as allowed under the
copyright laws.
Microsoft®, Windows®, Windows® XP,
and Windows Vista® are U.S. registered
trademarks of Microsoft Corporation.
The information contained herein is subject
to change without notice.
The only warranties for HP products and
services are set forth in the express warranty
statements accompanying such products and
services. Nothing herein should be
construed as constituting an additional
warranty. HP shall not be liable for technical
or editorial errors or omissions contained
herein.
Edition 1, 12/2012
Part number: A8P79-90904
ENERGY STAR and the ENERGY STAR mark
are registered U.S. marks.
Conventions used in this guide
TIP: Tips provide helpful hints or shortcuts.
NOTE: Notes provide important information to explain a concept or to complete a task.
CAUTION: Cautions indicate procedures that you should follow to avoid losing data or damaging
the product.
WARNING! Warnings alert you to specific procedures that you should follow to avoid personal
injury, catastrophic loss of data, or extensive damage to the product.
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Conventions used in this guide
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Table of contents
1 Removal and replacement ................................................................................................ 1
Removal and replacement strategy ............................................................................................. 2
General cautions during removal and replacement ........................................................ 2
Electrostatic discharge ............................................................................................... 2
Required tools ........................................................................................................... 3
Types of screws ........................................................................................................ 3
Service approach ..................................................................................................................... 5
Before performing service .......................................................................................... 5
After performing service ............................................................................................. 5
Post-service test ......................................................................................................... 5
Print-quality test .......................................................................................... 5
Location of connectors ............................................................................................... 7
DC controller connections ............................................................................ 7
Formatter connections ................................................................................. 9
Parts removal order ................................................................................................. 10
Removal and replacement procedures ...................................................................................... 11
Customer self repair (CSR) assemblies ....................................................................... 11
Toner cartridge ........................................................................................ 11
Tray 2 or Tray 3 assembly ......................................................................... 13
Document feeder rollers ............................................................................ 14
Document feeder pickup roller .................................................... 14
Document feeder separation roller ............................................... 16
Document feeder separation pad ............................................................... 17
External panels, covers, doors, and formatter ............................................................. 18
Formatter cover ........................................................................................ 18
Formatter PCA ......................................................................................... 19
Fax PCA and cable .................................................................................. 20
Interconnect board (ICB) ........................................................................... 21
Formatter stay .......................................................................................... 22
Dummy cover .......................................................................................... 23
Rear cover assembly ................................................................................. 24
Left cover ................................................................................................ 28
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Right-rear cover ........................................................................................ 30
Tray 1 cover ............................................................................................ 32
Cartridge-door assembly ........................................................................... 34
Right cover assembly ................................................................................ 36
Lower right cover ..................................................................................... 41
Reinstall the lower right cover ..................................................... 43
I/O plate ................................................................................................ 44
Document feeder assemblies and scanner .................................................................. 46
Document feeder/scanner assembly ........................................................... 46
Document feeder whole unit kit and scanner whole unit kit ............................ 52
Document feeder hinge assembly ............................................................... 57
Control-panel top-cover ............................................................................. 57
Control-panel assembly ............................................................................. 59
USB PCA ................................................................................................ 60
Control-panel FFC .................................................................................... 61
USB cable and USB grounding cable ......................................................... 64
Wi-Fi module and cable ............................................................................ 67
Main assemblies ..................................................................................................... 71
Tray 1 pickup roller .................................................................................. 71
Tray 1 separation pad .............................................................................. 73
Tray 2 or Tray 3 pickup roller .................................................................... 74
Tray 2 or Tray 3 separation pad ................................................................ 76
Tray 2 or Tray 3 base-plate roller assembly ................................................. 76
Transfer roller .......................................................................................... 78
Fuser ...................................................................................................... 80
Duplex paper-feed assembly ...................................................................... 83
Registration roller assembly ....................................................................... 86
Power-switch assembly .............................................................................. 88
Interlock-switch assembly ........................................................................... 89
Tray sensor PCA ...................................................................................... 91
Main fan ................................................................................................. 93
Top cover ................................................................................................ 95
Laser scanner ........................................................................................... 98
Tag holder assembly ............................................................................... 101
DC controller ......................................................................................... 102
Low-voltage power supply (LVPS) .............................................................. 106
Tray 2 paper pickup assembly ................................................................. 112
Tray 1 or Tray 2 pickup solenoid ............................................................. 118
Fuser motor ........................................................................................... 120
Pendulum assembly ................................................................................ 121
Sub fan and fan duct .............................................................................. 124
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Environmental sensor .............................................................................. 128
High-voltage power supply (HVPS) ........................................................... 130
2 Parts and diagrams ...................................................................................................... 139
Order parts by authorized service providers ............................................................................ 140
Order parts, accessories, and supplies .................................................................... 140
Supplies part numbers ........................................................................................... 140
Customer self-repair (CSR) and service kits ............................................................... 141
Related documentation and software ...................................................................................... 142
Fasteners used in this product ................................................................................................ 142
How to use the parts lists and diagrams .................................................................................. 143
Assembly locations ............................................................................................................... 143
Base product (no optional trays or accessories) ......................................................... 143
Base product (optional trays or accessories) ............................................................. 144
Covers ................................................................................................................................ 146
Document feeder and scanner assemblies ............................................................................... 148
Control-panel and USB PCA assemblies .................................................................................. 150
Document feeder assemblies .................................................................................................. 152
Internal assemblies (1 of 6) ................................................................................................... 154
Internal assemblies (2 of 6) ................................................................................................... 156
Internal assemblies (3 of 6) ................................................................................................... 158
Internal assemblies (4 of 6) ................................................................................................... 160
Internal assemblies (5 of 6) ................................................................................................... 162
Internal assemblies (6 of 6) ................................................................................................... 164
Input devices ....................................................................................................................... 166
500-sheet input tray (Tray 3) .................................................................................. 166
Alphabetical parts list ........................................................................................................... 168
Numerical parts list .............................................................................................................. 172
Index ............................................................................................................................... 177
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