HP LASERJET PRO 400 - Page 7

Table of contents
1 Removal and replacement ................................................................................................ 1
Removal and replacement strategy ............................................................................................. 2
Electrostatic discharge ............................................................................................... 2
Required tools ........................................................................................................... 3
Types of screws ........................................................................................................ 3
Service approach ..................................................................................................................... 3
Before performing service .......................................................................................... 3
After performing service ............................................................................................. 4
Post-service test ......................................................................................................... 4
Print-quality test .......................................................................................... 4
Parts removal order ................................................................................................... 5
Removal and replacement procedures ........................................................................................ 6
Rollers ..................................................................................................................... 6
Multipurpose (MP) tray pickup roller ............................................................. 6
Multipurpose (MP) tray separation pad ......................................................... 6
Tray 2 and optional Tray 3 pickup roller ....................................................... 9
Tray 2 and optional Tray 3 separation pad ................................................. 10
Document feeder rollers ............................................................................ 11
Document feeder separation pad ............................................................... 12
Covers, scanner assembly, and control panel ............................................................. 13
Left cover ................................................................................................ 13
Scanner assembly .................................................................................... 13
Control panel .......................................................................................... 15
Right cover .............................................................................................. 17
Top cover ................................................................................................ 18
Rear cover, rear door, and feed assembly ................................................... 20
Cartridge door and front cover assembly .................................................... 22
Main assemblies ..................................................................................................... 25
Laser scanner assembly ............................................................................. 25
Registration assembly ............................................................................... 26
Fuser assembly and paper feed guide ......................................................... 28
Duplex drive assembly .............................................................................. 31
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