HP LaserJet Pro 400 MFP Printer Repair Manual

LASERJET PRO 400 MFP
Repair Manual
M425
HP LaserJet Pro 400 MFP M425 Series
Repair Manual
Copyright and License
Trademark Credits
© 2012 Copyright Hewlett-Packard
Development Company, L.P.
Microsoft®, Windows®, Windows® XP,
and Windows Vista® are U.S. registered
trademarks of Microsoft Corporation.
Reproduction, adaptation, or translation
without prior written permission is
prohibited, except as allowed under the
copyright laws.
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.
Part number: CF286-90979
Edition 1, 4/2012
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
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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Solenoids ............................................................................................................... 34
Tray 1 solenoid ........................................................................................ 34
Duplex solenoid ....................................................................................... 35
Motors and fans ...................................................................................................... 37
Main motor ............................................................................................. 37
Fan ........................................................................................................ 39
Printed circuit-board assemblies (PCAs) ...................................................................... 41
Engine controller assembly (DC controller) PCA ............................................ 41
Universal serial bus (USB) PCA .................................................................. 46
Formatter PCA ......................................................................................... 48
Wireless PCA .......................................................................................... 48
Fax PCA ................................................................................................. 49
Power switch PCA .................................................................................... 50
Connecting PCA ...................................................................................... 51
Miscellaneous parts ................................................................................................. 52
Transfer roller .......................................................................................... 52
Multipurpose (MP) tray pickup gear assembly .............................................. 53
Document feeder assembly ........................................................................ 54
Optional paper feeder (Tray 3) ................................................................................. 55
Optional paper feeder right cover .............................................................. 56
Optional paper feeder driver PCA .............................................................. 56
Optional paper feeder paper sensor PCA ................................................... 57
2 Parts and diagrams ........................................................................................................ 61
Order parts by authorized service providers .............................................................................. 62
Order replacement parts .......................................................................................... 62
Related documentation and software ......................................................................... 62
Supplies part numbers ............................................................................................. 62
Whole-unit replacement part numbers ........................................................................ 62
How to use the parts lists and diagrams .................................................................................... 64
Assembly locations ................................................................................................................. 65
Main unit ............................................................................................................... 65
Optional paper feeder ............................................................................................. 66
Covers, panels, and doors ...................................................................................................... 68
Internal assemblies ................................................................................................................. 70
Scanner and document feeder ................................................................................................. 82
Input devices ......................................................................................................................... 84
500-sheet paper feeder ........................................................................................... 84
Paper feeder covers .................................................................................. 84
Paper feeder main body (1 of 2) ................................................................ 86
Paper feeder main body (2 of 2) ................................................................ 88
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Alphabetical parts list ............................................................................................................. 90
Numerical parts list ................................................................................................................ 94
Index ................................................................................................................................. 99
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List of tables
Table 2-1ãOrder parts, accessories, and supplies .................................................................................... 62
Table 2-2ãRelated documentation and software ...................................................................................... 62
Table 2-3ãSupplies part numbers ........................................................................................................... 62
Table 2-4ãWhole-unit replacement part numbers ..................................................................................... 63
Table 2-5ãAssembly locations: main unit ................................................................................................ 65
Table 2-6ãAssembly locations: optional paper feeder .............................................................................. 66
Table 2-7ãCovers, panels, and doors ..................................................................................................... 69
Table 2-8ãInternal components (1 of 5) .................................................................................................. 71
Table 2-9ãInternal components (2 of 5) .................................................................................................. 73
Table 2-10ãInternal components (3 of 5) ................................................................................................ 75
Table 2-11ãInternal components (4 of 5) ................................................................................................ 77
Table 2-12ãInternal components (5 of 5) ................................................................................................ 79
Table 2-13ãPCA locations .................................................................................................................... 81
Table 2-14ãScanner and document feeder ............................................................................................. 83
Table 2-15ãPaper feeder covers ............................................................................................................ 85
Table 2-16ãPaper feeder main body (1 of 2) .......................................................................................... 87
Table 2-17ãPaper feeder main body (2 of 2) .......................................................................................... 89
Table 2-18ãAlphabetical parts list ......................................................................................................... 90
Table 2-19ãNumerical parts list ............................................................................................................. 94
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List of figures
Figure 1-1ãPhillips and Pozidriv screwdriver comparison ............................................................................ 3
Figure 1-2ãParts-removal order ................................................................................................................ 5
Figure 1-3ãRemove the MP tray roller ....................................................................................................... 6
Figure 1-4ãRemove the MP tray separation pad (1 of 5) ............................................................................. 7
Figure 1-5ãRemove the MP tray separation pad (2 of 5) ............................................................................. 7
Figure 1-6ãRemove the MP tray separation pad (3 of 5) ............................................................................. 8
Figure 1-7ãRemove the MP tray separation pad (4 of 5) ............................................................................. 8
Figure 1-8ãRemove the MP tray separation pad (5 of 5) ............................................................................. 9
Figure 1-9ãRemove the Tray 2 or Tray 3 pickup roller (1 of 2) .................................................................... 9
Figure 1-10ãRemove the Tray 2 or Tray 3 pickup roller (2 of 2) ................................................................ 10
Figure 1-11ãRemove the Tray 2 or Tray 3 separation pad ........................................................................ 10
Figure 1-12ãRemove the document feeder rollers (1 of 2) ......................................................................... 11
Figure 1-13ãRemove the document feeder rollers (2 of 2) ......................................................................... 11
Figure 1-14ãRemove the document feeder separation pad (1 of 2) ............................................................ 12
Figure 1-15ãRemove the document feeder separation pad (2 of 2) ............................................................ 12
Figure 1-16ãRemove the left cover ......................................................................................................... 13
Figure 1-17ãRemove the scanner assembly (1 of 2) ................................................................................. 14
Figure 1-18ãRemove the scanner assembly (2 of 2) ................................................................................. 14
Figure 1-19ãRemove the control panel (1 of 3) ........................................................................................ 15
Figure 1-20ãRemove the control panel (2 of 3) ........................................................................................ 16
Figure 1-21ãRemove the control panel (3 of 3) ........................................................................................ 16
Figure 1-22ãRemove the right cover ....................................................................................................... 17
Figure 1-23ãRemove the top-cover assembly (1 of 3) ............................................................................... 18
Figure 1-24ãRemove the top-cover assembly (2 of 3) ............................................................................... 19
Figure 1-25ãRemove the top-cover assembly (3 of 3) ............................................................................... 19
Figure 1-26ãRemove the rear cover, rear door, and feed assembly (1 of 3) ................................................ 20
Figure 1-27ãRemove the rear cover, rear door, and feed assembly (2 of 3) ................................................ 21
Figure 1-28ãRemove the rear cover, rear door, and feed assembly (3 of 3) ................................................ 21
Figure 1-29ãRemove the cartridge door assembly and front cover (1 of 4) .................................................. 22
Figure 1-30ãRemove the cartridge door assembly and front cover (2 of 4) .................................................. 23
Figure 1-31ãRemove the cartridge door assembly and front cover (3 of 4) .................................................. 23
Figure 1-32ãRemove the cartridge door assembly and front cover (4 of 4) .................................................. 24
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Figure 1-33ãRemove the laser scanner assembly (1 of 2) .......................................................................... 25
Figure 1-34ãRemove the laser scanner assembly (2 of 2) .......................................................................... 26
Figure 1-35ãRemove the registration assembly (1 of 3) ............................................................................ 27
Figure 1-36ãRemove the registration assembly (2 of 3) ............................................................................ 27
Figure 1-37ãRemove the registration assembly (3 of 3) ............................................................................ 28
Figure 1-38ãRemove the fuser (1 of 5) ................................................................................................... 29
Figure 1-39ãRemove the fuser (2 of 5) ................................................................................................... 29
Figure 1-40ãRemove the fuser (3 of 5) ................................................................................................... 30
Figure 1-41ãRemove the fuser (4 of 5) ................................................................................................... 30
Figure 1-42ãRemove the fuser (5 of 5) ................................................................................................... 31
Figure 1-43ãRemove the duplex drive assembly (1 of 4) ........................................................................... 32
Figure 1-44ãRemove the duplex drive assembly (2 of 4) ........................................................................... 32
Figure 1-45ãRemove the duplex drive assembly (3 of 4) ........................................................................... 33
Figure 1-46ãRemove the duplex drive assembly (4 of 4) ........................................................................... 33
Figure 1-47ãRemove the Tray 1 pickup solenoid (1 of 2) .......................................................................... 34
Figure 1-48ãRemove the Tray 1 pickup solenoid (2 of 2) .......................................................................... 35
Figure 1-49ãRemove the duplex solenoid ............................................................................................... 36
Figure 1-50ãRemove the main motor (1 of 4) .......................................................................................... 37
Figure 1-51ãRemove the main motor (2 of 4) .......................................................................................... 38
Figure 1-52ãRemove the main motor (3 of 4) .......................................................................................... 38
Figure 1-53ãRemove the main motor (4 of 4) .......................................................................................... 39
Figure 1-54ãRemove the fan (1 of 2) ...................................................................................................... 40
Figure 1-55ãRemove the fan (2 of 2) ...................................................................................................... 40
Figure 1-56ãAllow the engine controller assembly to cool ......................................................................... 41
Figure 1-57ãRemove the engine controller assembly (1 of 9) ..................................................................... 42
Figure 1-58ãRemove the engine controller assembly (2 of 9) ..................................................................... 42
Figure 1-59ãRemove the engine controller assembly (3 of 9) ..................................................................... 43
Figure 1-60ãRemove the engine controller assembly (4 of 9) ..................................................................... 43
Figure 1-61ãRemove the engine controller assembly (5 of 9) ..................................................................... 44
Figure 1-62ãRemove the engine controller assembly (6 of 9) ..................................................................... 44
Figure 1-63ãRemove the engine controller assembly (7 of 9) ..................................................................... 45
Figure 1-64ãRemove the engine controller assembly (8 of 9) ..................................................................... 45
Figure 1-65ãRemove the engine controller assembly (9 of 9) ..................................................................... 46
Figure 1-66ãRemove the USB PCA (1 of 2) ............................................................................................. 47
Figure 1-67ãRemove the USB PCA (2 of 2) ............................................................................................. 47
Figure 1-68ãRemove the formatter ......................................................................................................... 48
Figure 1-69ãRemove the wireless PCA ................................................................................................... 49
Figure 1-70ãRemove the fax PCA .......................................................................................................... 49
Figure 1-71ãRemove the power-switch PCA (1 of 3) ................................................................................. 50
Figure 1-72ãRemove the power-switch PCA (2 of 3) ................................................................................. 51
Figure 1-73ãRemove the power-switch PCA (3 of 3) ................................................................................. 51
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Figure 1-74ãRemove the connecting PCA ............................................................................................... 52
Figure 1-75ãRemove the transfer roller ................................................................................................... 53
Figure 1-76ãRemove the paper-pickup-gear assembly .............................................................................. 54
Figure 1-77ãRemove the document feeder (1 of 2) ................................................................................... 55
Figure 1-78ãRemove the document feeder (2 of 2) ................................................................................... 55
Figure 1-79ãRemove the optional paper feeder right cover ....................................................................... 56
Figure 1-80ãRemove the optional paper feeder driver PCA (1 of 2) ........................................................... 57
Figure 1-81ãRemove the optional paper feeder driver PCA (2 of 2) ........................................................... 57
Figure 1-82ãRemove the optional paper feeder paper sensor PCA (1 of 3) ................................................. 58
Figure 1-83ãRemove the optional paper feeder paper sensor PCA (2 of 4) ................................................. 58
Figure 1-84ãRemove the optional paper feeder paper sensor PCA (3 of 4) ................................................. 59
Figure 1-85ãRemove the optional paper feeder paper sensor PCA (4 of 4) ................................................. 59
Figure 2-1ãAssembly locations: main unit ............................................................................................... 65
Figure 2-2ãAssembly locations: optional paper feeder ............................................................................. 66
Figure 2-3ãCovers, panels, and doors ................................................................................................... 68
Figure 2-4ãInternal components (1 of 5) ................................................................................................. 70
Figure 2-5ãInternal components (2 of 5) ................................................................................................. 72
Figure 2-6ãInternal components (3 of 5) ................................................................................................. 74
Figure 2-7ãInternal components (4 of 5) ................................................................................................. 76
Figure 2-8ãInternal components (5 of 5) ................................................................................................. 78
Figure 2-9ãPCA locations ..................................................................................................................... 80
Figure 2-10ãScanner and document feeder ............................................................................................ 82
Figure 2-11ãPaper feeder covers ........................................................................................................... 84
Figure 2-12ãPaper feeder main body (1 of 2) ......................................................................................... 86
Figure 2-13ãPaper feeder main body (2 of 2) ......................................................................................... 88
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