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
ENWW
v
Summary of Contents for LaserJet Pro M521
Page 1: ...LASERJET PRO MFP Repair Manual M521 2 ...
Page 2: ......
Page 3: ...HP LaserJet Pro MFP M521 Printer Repair Manual ...
Page 6: ...iv Conventions used in this guide ENWW ...
Page 10: ...viii ENWW ...
Page 14: ...14 mm 4 Chapter 1 Removal and replacement ENWW ...
Page 148: ...138 Chapter 1 Removal and replacement ENWW ...
Page 155: ...ENWW Assembly locations 145 ...
Page 186: ...176 Chapter 2 Parts and diagrams ENWW ...
Page 189: ......
Page 190: ... 2012 Hewlett Packard Development Company L P www hp com A8P79 90904 A8P79 90904 A8P79 90904 ...