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HP LASERJET PRO 400 - Page 7

HP LASERJET PRO 400
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Table of contents
1 Removal and replacement .................................................................................................................... 1
Removal and replacement strategy ............................................................................................. 2
Introduction .............................................................................................................. 2
Removal and replacement strategy .............................................................................. 2
Electrostatic discharge ............................................................................................... 3
Required tools ........................................................................................................... 3
Types of screws ........................................................................................................ 4
Service approach ..................................................................................................................... 5
Before performing service .......................................................................................... 5
After performing service ............................................................................................. 5
Post-service tests ........................................................................................................ 6
Test 1 (print-quality test) ............................................................................... 6
Test 2 (copy-quality test) .............................................................................. 6
Test 3 (fax-quality test; fax models only) ........................................................ 6
Parts removal order ................................................................................................... 7
Removal and replacement procedures ........................................................................................ 9
Rollers and pads ....................................................................................................... 9
Transfer roller ............................................................................................ 9
Pickup roller (Tray 2 and Tray 3) ................................................................ 10
Separation roller (Trays 2 or 3) .................................................................. 13
Reinstall the separation roller ...................................................... 15
Document feeder pickup roller assembly ..................................................... 16
Pickup roller and separation pad (Tray 1) ................................................... 17
Main assemblies ..................................................................................................... 20
Print-cartridge drawer ............................................................................... 20
DIMM cover ............................................................................................ 22
Right cover .............................................................................................. 23
Document feeder input tray ........................................................................ 25
Scanner assembly .................................................................................... 26
Right-front cover and power button ............................................................. 28
Rear-upper cover (duplex product) .............................................................. 30
Paper-feed guide assembly ........................................................................ 31
ENWW v

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