HP Pro 400 User Manual

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LASERJET PRO 400

Repair Manual

M401

HP LaserJet Pro 400 M401 Printer Series

Repair Manual

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.

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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
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

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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

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Index .................................................................................................................................

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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

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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 Remove the cartridge door assembly and front cover (4 of 4) ..................................................	25
Figure 1-32 Remove the laser scanner assembly (1 of 2) ..........................................................................	26

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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 Remove 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

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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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1 Removal and replacement

●Removal and replacement strategy

●Service approach

●Removal and replacement procedures

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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.

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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.

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Service approach

●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.

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5 approach Service

Component	Remove	Remove	Remove	Remove	Remove	Remove
Toner cartridge

Tray 2 cassette
Tray 1 pickup roller

Left cover	Tray 2 cassette
Right cover	Tray 2 cassette

Tray 1 separation pad	Left cover
Tray 1 pickup gear assembly	Left cover

Tray 2/3 pickup roller	Tray 2/3 cassette
Tray 2/3 separation roller	Tray 2/3 cassette

Transfer roller	Toner cartridge
Rear cover and feed assembly	Left cover	Right cover

Top cover	Left cover	Right cover
LCD control-panel	Left cover	Right cover	Top cover

Touchscreen control-panel	Left cover	Right cover	Top cover
Front-door and front-cover assembly	Left cover	Right cover

Laser scanner assembly	Left cover	Right cover	Top cover
Registration roller assembly	Left cover	Right cover	Top cover	Rear cover and
				feed assembly

Fuser assembly and paper feed guide	Left cover	Right cover	Rear cover and feed assembly
Face down drive or duplex drive assembly	Left cover	Right cover	Top cover

Tray 1 solenoid	Left cover
Tray 2 solenoid	Right cover

Duplex solenoid	Left cover	Right cover	Top cover	Rear cover and
				feed assembly

Main motor	Left cover	Right cover	Top cover	Rear cover and	Fuser	ECU
				feed assembly

Fan	Left cover	Right cover	Top cover
Engine controller unit (ECU) PCA	Left cover	Right cover	Top cover	Rear cover and
				feed assembly

Formatter PCA	Left cover	Wireless PCA
		(wireless models)

USB PCA (touchscreen CP model)	Left cover

Wireless PCA	Left cover
Power switch PCA	Left cover	Right cover	Front cover assembly

Connecting PCA	Right cover
Optional paper feeder driver PCA	Tray 3 right cover

Optional paper feeder paper sensor PCA	Tray 3 right cover

removal-Parts 2-1 Figure	diagram following the Use	order removal Parts
order	determine to
	.parts other removing before removed be must parts which

Removal and replacement procedures

Rollers

Multipurpose (MP) tray pickup roller

1.Open the toner cartridge door, and then remove the toner cartridge.

2.Pull back and hold the pickup roller cover (callout 1), press the tabs (callout 2) on both ends of the pickup roller away from the roller — which should cause the roller to move up — and then remove the roller.

Figure 1-3 Remove the MP tray pickup roller

Multipurpose (MP) tray separation pad

To remove the separation pad, you must first remove the pickup roller assembly.

1.Remove the following components:

●Tray 2 cassette

●Left cover. See Left cover on page 11.

2.Open the toner cartridge door, and then remove the toner cartridge.

Chapter 1 Removal and replacement

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3.On the left side of the product, release the innermost tab (callout 1) at the center of the gear, and then remove the gear (callout 2).

NOTE: The gear is composed of two pieces. Releasing the outer tab does not remove the entire gear assembly and exposes an internal spring in the gear.

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

	1
3	2
3

Reinstallation tip Press and hold back the gear arm (callout 3) when reinstalling the pickup gear.

4.In the toner cartridge cavity, pull back the pickup roller cover, and then use a small flat-blade screwdriver to release the tab (callout 1) on the pickup roller shaft.

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

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Removal and replacement procedures

5.Move the pickup roller shaft to the left to free the right end of the shaft from the holder, and then remove the pickup roller shaft assembly to expose the separation pad.

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

Reinstallation tip The spring at the right end of the shaft is not captive and might fall off during this process. Make sure that the spring is positioned correctly when reinstalling, as shown in the following figure.

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

Chapter 1 Removal and replacement

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6.Pull up on the top edge of the separation pad to release it from the product.

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

Reinstallation tip When reinstalling the pickup roller shaft assembly, make sure that the flat part of the pickup roller is directly over the separation pad.

Tray 2 and optional Tray 3 pickup roller

1.Remove the tray cassette from the product.

2.Locate the pickup roller at the top of the cassette cavity. On the left roller holder, release the tab (callout 1), and then turn the holder away from you.

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

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Removal and replacement procedures

3.Push the pickup roller to the left to release the right side roller, and then pull the roller out of the product.

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

Tray 2 and optional Tray 3 separation pad

1.Remove the tray cassette from the product.

2.Locate the separation pad at the front of the cassette. On the separation pad, remove two screws (callout 1), and then remove the pad from the tray cassette.

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

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Covers and control panel

Left cover

NOTE: No tools are necessary to remove this cover. However, a small flat-blade screwdriver might be helpful in releasing some of the tabs that hold the cover to the product chassis.

1.Remove the Tray 2 cassette.

2.Open the toner cartridge door and the rear jam access door.

3.Grasp the front edge of the cover, and then pull the cover toward the front to release the four tabs (callout 1).

Figure 1-12 Remove the left cover

4.With the top and front edges loose, carefully slide the cover toward the back of the product, and then remove it.

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Right cover

NOTE: No tools are necessary to remove this cover. However, a small flat-blade screwdriver might be helpful in releasing some of the tabs that hold the cover to the product chassis.