HP — HP LaserJet Pro 400 MFP M425 — руководство по ремонту (EN)

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 ENWW v