HP CZ195ABGJ User manual

LASERJET PRO 400

Repair Manual

M401

HP LaserJet Pro 400 M401 Printer Series

Repair Manual

Copyright and License

Development Company, L.P.

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: CF270-90977

Edition 1, 4/2012

Trademark Credits

Microsoft®, Windows®, Windows® XP,

and Windows Vista® are U.S. registered

trademarks of Microsoft Corporation.

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.

ENWW iii

iv Conventions used in this guide ENWW

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

Covers and control panel ......................................................................................... 11

Left cover ................................................................................................ 11

Right cover .............................................................................................. 12

Top cover with LCD control-panel module .................................................... 13

LCD control panel .................................................................................... 14

Top cover with touchscreen control-panel module ......................................... 16

Touchscreen control panel ......................................................................... 18

Rear cover, rear door, and feed assembly ................................................... 20

Cartridge door and front cover assembly .................................................... 23

Main assemblies ..................................................................................................... 26

Laser scanner assembly ............................................................................. 26

Registration roller assembly ....................................................................... 27

Fuser assembly and paper feed guide ......................................................... 29

Face down drive or duplex drive assembly .................................................. 32

Solenoids ............................................................................................................... 34

ENWW v

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

Power switch PCA .................................................................................... 49

Connecting PCA ...................................................................................... 51

Miscellaneous parts ................................................................................................. 52

Transfer roller .......................................................................................... 52

Multipurpose (MP) tray pickup gear assembly .............................................. 52

Optional paper feeder (Tray 3) ................................................................................. 53

Optional paper feeder right cover .............................................................. 54

Optional paper feeder driver PCA .............................................................. 54

Optional paper feeder paper sensor PCA ................................................... 55

2 Parts and diagrams ........................................................................................................ 59

Order parts by authorized service providers .............................................................................. 60

Order replacement parts .......................................................................................... 60

Related documentation and software ......................................................................... 60

Supplies part numbers ............................................................................................. 60

Whole-unit replacement part numbers ........................................................................ 60

How to use the parts lists and diagrams .................................................................................... 62

Assembly locations ................................................................................................................. 63

HP LaserJet M401a, M401n, M401d models ............................................................. 63

HP LaserJet M401dn and M401dw models ................................................................ 64

Optional paper feeder ............................................................................................. 65

Covers, panels, and doors ...................................................................................................... 66

Internal assemblies ................................................................................................................. 70

Input devices ......................................................................................................................... 82

500-sheet paper feeder ........................................................................................... 82

Paper feeder covers .................................................................................. 82

Paper feeder main body (1 of 2) ................................................................ 84

Paper feeder main body (2 of 2) ................................................................ 86

Alphabetical parts list ............................................................................................................. 88

Numerical parts list ................................................................................................................ 93

vi ENWW

Index ................................................................................................................................. 99

ENWW vii

viii ENWW

List of tables

Table 2-1 Order parts, accessories, and supplies .................................................................................... 60

Table 2-2 Related documentation and software ...................................................................................... 60

Table 2-3 Supplies part numbers ........................................................................................................... 60

Table 2-4 Whole-unit replacement part numbers ..................................................................................... 60

Table 2-5 Assembly locations: HP LaserJet M401a, M401n, M401d models ............................................. 63

Table 2-6 Assembly locations: HP LaserJet M401dn and M401dw models ................................................ 64

Table 2-7 Assembly locations: optional paper feeder .............................................................................. 65

Table 2-8 Covers, panels, and doors (LCD control panel models) .............................................................. 67

Table 2-9 Covers, panels, and doors (touchscreen control panel models) ................................................... 69

Table 2-10 Internal components (1 of 5) ................................................................................................ 71

Table 2-11 Internal components (2 of 5) ................................................................................................ 73

Table 2-12 Internal components (3 of 5) ................................................................................................ 75

Table 2-13 Internal components (4 of 5) ................................................................................................ 77

Table 2-14 Internal components (5 of 5) ................................................................................................ 79

Table 2-15 PCA location ..................................................................................................................... 81

Table 2-16 Paper feeder covers ............................................................................................................ 83

Table 2-17 Paper feeder main body (1 of 2) .......................................................................................... 85

Table 2-18 Paper feeder main body (2 of 2) .......................................................................................... 87

Table 2-19 Alphabetical parts list ......................................................................................................... 88

Table 2-20 Numerical parts list ............................................................................................................. 93

ENWW ix

x ENWW

List of figures

Figure 1-1 Phillips and Pozidriv screwdriver comparison ............................................................................ 3

Figure 1-2 Parts-removal order ................................................................................................................ 5

Figure 1-3 Remove the MP tray pickup roller ............................................................................................ 6

Figure 1-4 Remove the MP tray separation pad (1 of 5) ............................................................................. 7

Figure 1-5 Remove the MP tray separation pad (2 of 5) ............................................................................. 7

Figure 1-6 Remove the MP tray separation pad (3 of 5) ............................................................................. 8

Figure 1-7 Remove the MP tray separation pad (4 of 5) ............................................................................. 8

Figure 1-8 Remove the MP tray separation pad (5 of 5) ............................................................................. 9

Figure 1-9 Remove the Tray 2 or Tray 3 pickup roller (1 of 2) .................................................................... 9

Figure 1-10 Remove the Tray 2 or Tray 3 pickup roller (2 of 2) ................................................................ 10

Figure 1-11 Remove the Tray 2 or Tray 3 separation pad ........................................................................ 10

Figure 1-12 Remove the left cover ......................................................................................................... 11

Figure 1-13 Remove the right cover ....................................................................................................... 12

Figure 1-14 Remove the top-cover assembly and LCD control-panel module (1 of 3) .................................... 13

Figure 1-15 Remove the top-cover assembly and LCD control-panel module (2 of 3) .................................... 13

Figure 1-16 Remove the top-cover assembly and LCD control-panel module (3 of 3) .................................... 14

Figure 1-17 Remove the LCD control panel (1 of 2) ................................................................................. 15

Figure 1-18 Remove the LCD control panel (2 of 2) ................................................................................. 15

Figure 1-19 Remove the top-cover assembly (1 of 3) ............................................................................... 16

Figure 1-20 Remove the top-cover assembly (2 of 3) ............................................................................... 17

Figure 1-21 Remove the top-cover assembly (3 of 3) ............................................................................... 17

Figure 1-22 Remove the touchscreen control panel (1 of 3) ...................................................................... 18

Figure 1-23 Remove the touchscreen control panel (2 of 3) ...................................................................... 19

Figure 1-24 Remove the touchscreen control panel (3 of 3) ...................................................................... 19

Figure 1-25 Remove the rear cover, rear door, and feed assembly (1 of 3) ................................................ 20

Figure 1-26 Remove the rear cover, rear door, and feed assembly (2 of 3) ................................................ 21

Figure 1-27 Remove the rear cover, rear door, and feed assembly (3 of 3) ................................................ 22

Figure 1-28 Remove the cartridge door assembly and front cover (1 of 4) .................................................. 23

Figure 1-29 Remove the cartridge door assembly and front cover (2 of 4) .................................................. 24

Figure 1-30 Remove the cartridge door assembly and front cover (3 of 4) .................................................. 24

Figure 1-31 Re

move the cartridge door assembly and front cover (4 of 4) .................................................. 25

Figure 1-32 Remove the laser scanner assembly (1 of 2) .......................................................................... 26

ENWW xi

Figure 1-33 Remove the laser scanner assembly (2 of 2) .......................................................................... 27

Figure 1-34 Remove the registration assembly (1 of 3) ............................................................................ 28

Figure 1-35 Remove the registration assembly (2 of 3) ............................................................................ 28

Figure 1-36 Remove the registration assembly (3 of 3) ............................................................................ 29

Figure 1-37 Remove the fuser (1 of 5) ................................................................................................... 30

Figure 1-38 Remove the fuser (2 of 5) ................................................................................................... 30

Figure 1-39 Remove the fuser (3 of 5) ................................................................................................... 31

Figure 1-40 Remove the fuser (4 of 5) ................................................................................................... 31

Figure 1-41 Remove the fuser (5 of 5) ................................................................................................... 32

Figure 1-42 Remove the face-down-drive or duplex drive assembly (1 of 2) ................................................ 33

Figure 1-43 Remove the face-down-drive or duplexing-paper-feed assembly (2 of 2) ................................... 33

Figure 1-44 Remove the Tray 1 pickup solenoid (1 of 2) .......................................................................... 34

Figure 1-45 Remove the Tray 1 pickup solenoid (2 of 2) .......................................................................... 35

Figure 1-46 Remove the duplex solenoid ............................................................................................... 36

Figure 1-47 Remove the main motor (1 of 4) .......................................................................................... 37

Figure 1-48 Remove the main motor (2 of 4) .......................................................................................... 38

Figure 1-49 Remove the main motor (3 of 4) .......................................................................................... 38

Figure 1-50 Remove the main motor (4 of 4) .......................................................................................... 39

Figure 1-51 Remove the fan (1 of 2) ...................................................................................................... 40

Figure 1-52 Remove the fan (2 of 2) ...................................................................................................... 40

Figure 1-53 Allow the engine controller assembly to cool ......................................................................... 41

Figure 1-54 Remove the engine controller assembly (1 of 9) ..................................................................... 42

Figure 1-55 Remove the engine controller assembly (2 of 9) ..................................................................... 42

Figure 1-56 Remove the engine controller assembly (3 of 9) ..................................................................... 43

Figure 1-57 Remove the engine controller assembly (4 of 9) ..................................................................... 43

Figure 1-58 Remove the engine controller assembly (5 of 9) ..................................................................... 44

Figure 1-59 Remove the engine controller assembly (6 of 9) ..................................................................... 44

Figure 1-60 Remove the engine controller assembly (7 of 9) ..................................................................... 45

Figure 1-61 Remove the engine controller assembly (8 of 9) ..................................................................... 45

Figure 1-62 Remove the engine controller assembly (9 of 9) ..................................................................... 46

Figure 1-63 Re

move the USB PCA (1 of 2) ............................................................................................. 47

Figure 1-64 Remove the USB PCA (2 of 2) ............................................................................................. 47

Figure 1-65 Remove the formatter ......................................................................................................... 48

Figure 1-66 Remove the wireless PCA ................................................................................................... 49

Figure 1-67 Remove the power-switch PCA (1 of 3) ................................................................................. 50

Figure 1-68 Remove the power-switch PCA (2 of 3) ................................................................................. 50

Figure 1-69 Remove the power-switch PCA (3 of 3) ................................................................................. 51

Figure 1-70 Remove the connecting PCA ............................................................................................... 51

Figure 1-71 Remove the transfer roller ................................................................................................... 52

Figure 1-72 Remove the paper-pickup-gear assembly .............................................................................. 53

Figure 1-73 Remove the optional paper feeder right cover ....................................................................... 54

xii ENWW

Figure 1-74 Remove the optional paper feeder driver PCA (1 of 2) ........................................................... 54

Figure 1-75 Remove the optional paper feeder driver PCA (2 of 2) ........................................................... 55

Figure 1-76 Remove the optional paper feeder paper sensor PCA (1 of 4) ................................................. 55

Figure 1-77 Remove the optional paper feeder paper sensor PCA (2 of 4) ................................................. 56

Figure 1-78 Remove the optional paper feeder paper sensor PCA (3 of 4) ................................................. 56

Figure 1-79 Remove the optional paper feeder paper sensor PCA (4 of 4) ................................................. 57

Figure 2-1 Assembly locations: HP LaserJet M401a, M401n, M401d models ............................................ 63

Figure 2-2 Assembly locations: HP LaserJet M401dn and M401dw models ............................................... 64

Figure 2-3 Assembly locations: optional paper feeder ............................................................................. 65

Figure 2-4 Covers, panels, and doors (LCD control panel models) ............................................................. 66

Figure 2-5 Covers, panels, and doors (touchscreen control panel models) .................................................. 68

Figure 2-6 Internal components (1 of 5) ................................................................................................. 70

Figure 2-7 Internal components (2 of 5) ................................................................................................. 72

Figure 2-8 Internal components (3 of 5) ................................................................................................. 74

Figure 2-9 Internal components (4 of 5) ................................................................................................. 76

Figure 2-10 Internal components (5 of 5) ............................................................................................... 78

Figure 2-11 PCA location .................................................................................................................... 80

Figure 2-12 Paper feeder covers ........................................................................................................... 82

Figure 2-13 Paper feeder main body (1 of 2) ......................................................................................... 84

Figure 2-14 Paper feeder main body (2 of 2) ......................................................................................... 86

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xiv ENWW

1 Removal and replacement

●

Removal and replacement strategy

●

Service approach

●

Removal and replacement procedures

ENWW 1

Removal and replacement strategy

WARNING! Turn the product off, wait 5 seconds, and then remove the power cord before

attempting to service the product. If this warning is not followed, severe injury can result, in addition to

damage to the product. The power must be on for certain functional checks during problem solving.

However, the power supply should be disconnected during parts removal.

Never operate or service the product with the protective cover removed from the laser scanner

assembly. The reflected beam, although invisible, can damage your eyes.

The sheet-metal parts can have sharp edges. Be careful when handling sheet-metal parts.

CAUTION: Do not bend or fold the flat flexible cables (FFCs) during removal or installation. Also, do

not straighten pre-folds in the FFCs. You must Make sure that all FFCs are fully seated in their

connectors. Failure to fully seat an FFC into a connector can cause a short circuit in a PCA.

NOTE: To install a self-tapping screw, first turn it counterclockwise to align it with the existing thread

pattern, and then carefully turn it clockwise to tighten. Do not overtighten. If a self-tapping screw-hole

becomes stripped, repair the screw-hole or replace the affected assembly.

Electrostatic discharge

CAUTION: Some parts are sensitive to electrostatic discharge (ESD). Look for the ESD reminder

when removing product parts. Always perform service work at an ESD-protected workstation or mat. If

an ESD workstation or mat is not available, ground yourself by touching the sheet-metal chassis before

touching an ESD-sensitive part.

Protect the ESD-sensitive parts by placing them in ESD pouches when they are out of the product.

2 Chapter 1 Removal and replacement ENWW

Required tools

●

#2 Phillips screwdriver with a magnetic tip and a 152 mm (6 in) shaft length

●

Small flatblade screwdriver

●

Needle-nose pliers

●

ESD mat (if one is available) or ESD strap

●

Penlight (optional)

CAUTION: Always use a Phillips screwdriver (callout 1). Do not use a Pozidriv® screwdriver

(callout 2) or any motorized screwdriver. These can damage screws or screw threads.

Figure 1-1 Phillips and Pozidriv screwdriver comparison

CAUTION: Avoid pulling directly on wires to disconnect wire-harness connectors. Pull on the plastic

body of a connector to avoid damaging the connector wires.

Types of screws

WARNING! Make sure that components are replaced with the correct screw type. Using the

incorrect screw (for example, substituting a long screw for the correct shorter screw) can cause damage

to the product or interfere with product operation. Do not intermix screws that are removed from one

component with the screws that are removed from another component.

For a complete list of screw types and part numbers, see the Parts chapter.

Service approach

Before performing service

●

Remove all paper from the product.

●

Turn off the power using the power switch.

●

Unplug the power cable and interface cable or cables.

●

Place the product on an ESD workstation or mat, or use an ESD strap (if one is available). If an

ESD workstation, mat, or strap is not available, ground yourself by touching the sheet-metal

chassis before touching an ESD-sensitive part.

ENWW

Service approach

3

●

Remove the toner cartridge.

●

Remove the Tray 2 cassette.

After performing service

●

Plug in the power cable.

●

Reinstall the toner cartridge.

●

Reinstall the Tray 2 cassette.

●

Load paper in the product.

Post-service test

Perform the following test to verify that the repair or replacement was successful.

Print-quality test

1. Verify that you have completed the necessary reassembly steps.

2. Make sure that the tray contains clean, unmarked paper.

3. Attach the power cord and interface cable or interface cables, and then turn on the product.

4. Verify that the expected startup sounds occur.

5. Print a configuration page, and then verify that the expected printing sounds occur.

6. Print a demo page, and then verify that the print quality is as expected.

7. Send a print job from the host computer, and then verify that the output meets expectations.

8. Clean the outside of the product with a damp cloth.

4 Chapter 1 Removal and replacement ENWW

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