HP Laserjet M435 repair guide manual

LASERJET PRO MFP

Repair Guide

M435nw

HP LaserJet Pro MFP M435nw

Repair Manual

Trademark Credits

, Acrobat®, and PostScript® are

Adobe trademarks of Adobe Systems Incorporated.

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.

Edition 1, 5/2013

Part number: A3E42-90978

Microsoft®, Windows®, Windows® XP, and Windows Vista® are U.S. registered trademarks of Microsoft Corporation.

ENERGY STAR and the ENERGY STAR mark are registered U.S. marks.

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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iv Conventions used in this guide ENWW

Table of contents

1 Removal and replacement .............................................................................................................................. 1

Removal and replacement strategy ...................................................................................................................... 2

Introduction ......................................................................................................................................... 2

Required tools ..................................................................................................................................... 2

Types of screws ................................................................................................................................... 3

Service approach ................................................................................................................................. 3

Before performing service .................................................................................................................. 3

After performing service ..................................................................................................................... 4

Parts removal order ............................................................................................................................ 5

Customer self-repair parts .................................................................................................................................... 6

Tray 1 roller kit .................................................................................................................................... 6

Tray 2 roller kit .................................................................................................................................... 9

Tray 3 roller kit .................................................................................................................................. 13

Transfer roller ................................................................................................................................... 16

External doors, covers, and panels ..................................................................................................................... 17

Right cover assembly ........................................................................................................................ 17

Lower back cover .............................................................................................................................. 18

Rear-cover assembly ........................................................................................................................ 18

Top cover ........................................................................................................................................... 19

Left cover ........................................................................................................................................... 21

Face-down cover ............................................................................................................................... 21

Tray 2 ................................................................................................................................................. 22

Tray 3 ................................................................................................................................................. 23

Right front cover ............................................................................................................................... 24

Right cassette cover .......................................................................................................................... 25

Right handle cover ............................................................................................................................ 25

Multi-purpose tray cover assembly .................................................................................................. 27

Cartridge door assembly ................................................................................................................... 29

Scanner subassembly (SSA) .............................................................................................................. 37

Scanner subassembly (SSA) lid ......................................................................................................... 41

Control panel ..................................................................................................................................... 41

Internal assemblies ............................................................................................................................................. 44

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Laser/scanner .................................................................................................................................... 44

Fuser .................................................................................................................................................. 46

Fuser motor ....................................................................................................................................... 46

Right fan ............................................................................................................................................ 47

Left fan .............................................................................................................................................. 49

Registration unit ............................................................................................................................... 52

Paper-feed assembly ........................................................................................................................ 53

Printed circuit assemblies (PCAs) ........................................................................................................................ 56

Front USB PCA ................................................................................................................................... 56

DC controller PCA .............................................................................................................................. 57

Formatter and Wi-Fi PCAs ................................................................................................................. 59

High-voltage power supply ............................................................................................................... 61

Low-voltage power supply PCA ........................................................................................................ 69

Duplexer ............................................................................................................................................................... 74

Duplexer ............................................................................................................................................ 74

Duplexer left cover ............................................................................................................................ 74

Duplexer right cover .......................................................................................................................... 75

Duplexer top cover ............................................................................................................................ 76

Duplexer rear cover ........................................................................................................................... 77

Duplex drive assembly ...................................................................................................................... 78

Duplexer driver PCA .......................................................................................................................... 86

Duplexer fan ...................................................................................................................................... 87

Registration sensor photoreceiver assembly .................................................................................. 90

Registration sensor LED assembly ................................................................................................... 95

500-sheet feeder ............................................................................................................................................... 102

500-sheet feeder front cover ......................................................................................................... 102

500-sheet feeder left cover ............................................................................................................ 103

500-sheet feeder right cover .......................................................................................................... 103

500-sheet feeder cassette cover ................................................................................................... 104

500-sheet feeder paper-pickup unit .............................................................................................. 105

500-sheet feeder lifter drive unit ................................................................................................... 106

500-sheet feeder drive unit ............................................................................................................ 107

500-sheet feeder drive PCA ............................................................................................................ 111

500-sheet feeder pickup motor ..................................................................................................... 112

2 Parts and diagrams .................................................................................................................................... 115

Order parts by authorized service providers .................................................................................................... 115

Service kit parts .............................................................................................................................. 115

Whole-unit replacement part numbers .......................................................................................... 117

Supplies and accessories part numbers ......................................................................................... 117

1 Removal and replacement

●

Removal and replacement strategy

●

Customer self-repair parts

●

External doors, covers, and panels

●

Internal assemblies

●

Printed circuit assemblies (PCAs)

●

Duplexer

●

500-sheet feeder

ENWW 1

Removal and replacement strategy

Introduction

This chapter describes the removal and replacement of field-replaceable units (FRUs) only.

Replacing FRUs is generally the reverse of removal. Notes are included to provide directions for difficult or critical replacement procedures.

HP does not support repairing individual subassemblies or troubleshooting to the component level.

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: 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.

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

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.

Required tools

●

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

●

Small flatblade screwdriver

●

T-10 Torx® screw driver

●

Needle-nose pliers

●

ESD strap (if one is available)

●

Penlight

CAUTION: Always use a Phillips screwdriver (callout 1). Do not use a pozidrive screwdriver (callout 2) or any

motorized screwdriver. These can damage screws or screw threads.

Figure 1-1 Screwdrivers

2 Chapter 1 Removal and replacement ENWW

CAUTION: Do not pull directly on the wires to disconnect them. Always 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 an 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

Printer repair normally begins by using the product internal diagnostics and the following two-step process:

1. Isolate the problem to the major system (for example, the network or server, or the product).

2. Troubleshoot the problem by using the procedures in chapter 2.

After you locate a faulty part, the product can usually be repaired at the assembly level by replacing FRUs. Some mechanical assemblies might need to be repaired at the subassembly level. Hewlett-Packard Company does not support replacement of components on the printed circuit assembles.

Before performing service

1. Turn the product off, wait 5 seconds, and then remove the power cord before attempting to service the

product.

CAUTION: If this warning is not followed, severe injury and damage to the device can result. The power

must be on for certain functional checks during troubleshooting. However, the power supply must be disconnected during parts removal.

2. Remove all media.

3. Place the product on an ESD mat (if available).

4. Remove the print cartridge.

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5. Remove tray 2.

After performing service

●

Return all media to the trays.

●

Reinstall the print cartridge.

●

Reinstall tray 2.

●

Reinstall and plug in the power cable, and then turn the product on.

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Parts removal order

Use the following diagram to determine which parts must be removed before removing other parts.

Figure 1-2 Parts removal order

Printer

Scanner Lid Lower Rear Cover

MP tray cover Transfer roller Right Cover Ass'y

Rear cover Ass'y

Fuser

Left Cover

Fixing motor (also remove top cover ass'y)

Scanner with CP (Also remove I/O door)

Control Panel Top Cover ass'y (also remove Rear cover ass'y and left cover)

Face down cover

Delivery ass'y (also remove Fuser)

Laser Scanner Right Front Cover Sub Fan (also remove left cover)

L.V Power supply (also remove rear cover ass'y, right handle cover)

Main Fan (also remove Top cover ass'y)

Duplexer

Left Cover Right Cover

500 Sheet Feeder

Front Cover

Cartridge door ass'y (also remove left cover) Registration unit

Paper feed unit (also remove transfer roller and Fuser)

H.V Power supply (also remove Fuser)

Formatter (together with wiﬁ board)

wiﬁ board Formatter stay (metal)

DC controller

Main motor (also remove Right handle cover)

Right Cassette cover or walk up USB cover(also remove Tray 2 cassette)

walk up USB board Right handle cover

Cassette pick up ass'y (also remove cartridge door ass'y)

Top Cover (also remove Left Cover)

Rear Cover

Duplex drive ass'y (motor included) Duplex driver (PCA)

Duplex fan

Right Cover

cassette cover PF cassette pickup ass'y (also remove left cover)

Drive PCA (also remove left cover)

PF cassette lifter drive ass'y PF cassette pickup motor

Left Cover

ENWW Removal and replacement strategy 5

Customer self-repair parts

The user replaces print cartridges as they are depleted. The HP LaserJet Pro M435 Series products Service Manual explains when to replace these supplies and provides instructions about replacing them. Additional

instructions on other user-replaceable parts are provided in this section.

The product tracks the amount of use on the customer-replaceable supplies by keeping a page count.

Swapping supplies between products might cause a misrepresentation of supply life values and is not recommended.

Tray 1 roller kit

1. Tray 1 pickup roller

a. Open the cartridge door and locate the tray 1 pickup roller.

Figure 1-3 Remove the tray 1 pickup roller (1 of 3)

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b. Push out the two black tabs.

Figure 1-4 Remove the tray 1 pickup roller (2 of 3)

c. Remove the tray 1 pickup roller.

Figure 1-5 Remove the tray 1 pickup roller (3 of 3)

2. Tray 1 separation pad

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a. Grasp the handles and then open the multi-purpose tray door.

Figure 1-6 Remove the tray 1 separation pad (1 of 4)

b. Release two levers.

Figure 1-7 Remove the tray 1 separation pad (2 of 4)

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c. Remove one screw.

Figure 1-8 Remove the tray 1 separation pad (3 of 4)

d. Lift the input bin and hold it up with your hand, and then remove the tray 1 separation pad

assembly.

Tray 2 roller kit

1. Tray 2 pickup roller

Figure 1-9 Remove the tray 1 separation pad (4 of 4)

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a. Remove tray 2.

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

b. From the front of the product, look up inside the product to identify the roller.

Figure 1-11 Remove the tray 2 pickup roller (2 of 3)

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c. Squeeze the two blue tabs (callout 1) together, push to the left, and then pull the roller down to

remove it.

Figure 1-12 Remove the tray 2 pickup roller (2 of 3)

2. Tray 2 separation pad

a. Remove tray 2.

Figure 1-13 Remove the tray 2 separation pad (1 of 4)

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b. Locate the tray 2 separation pad.

Figure 1-14 Remove the tray 2 separation pad (2 of 4)

c. Remove two screws.

Figure 1-15 Remove the tray 2 separation pad (3 of 4)

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d. Lift up the separation pad to remove it.

Tray 3 roller kit

1. Remove tray 3.

Figure 1-16 Remove the tray 2 separation pad (4 of 4)

Figure 1-17 Remove the tray 3 feed roller 1(1 of 5)

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2. Locate the tray 3 feed roller 1 inside tray 3 cassette.

Figure 1-18 Remove the tray 3 feed roller 1 (2 of 5)

3. Remove the tray 3 feed roller 1 located inside tray 3.

Figure 1-19 Remove the tray 3 feed roller 1 (3 of 5)

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4. Look up inside the product to locate the tray 3 feed roller 2 and tray 3 pickup roller located inside the

tray 3 assembly.

Figure 1-20 Remove the tray 3 pickup and feed roller 2 (4 of 5)

5. Remove the blue feed roller by squeezing the left side of the roller tab (callout 1), and then slide it to

the left to remove the feed roller. To remove the pickup roller (callout 2), pinch the white tab, and then slide the pickup roller to the left to remove it.

Figure 1-21 Remove the tray 3 pickup and feed roller 2 (5 of 5)

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Transfer roller

WARNING! The transfer roller bar has grease on its surface. Wear a thin glove, like an ESD glove, to keep

the grease off your skin.

1. Open the print-cartridge door.

2. Unlatch the blue latch on the right (callout 2), and then lift up the transfer roller on the left side of the

product (callout 1) to remove it.

Figure 1-22 Remove the transfer roller

NOTE: Do not touch the rubber sponge on the transfer roller.

NOTE: When you reinstall the transfer roller, snap it into the left side of the product first, and then install

and latch on the right side of the product.

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External doors, covers, and panels

Right cover assembly

1. Open the door at the rear of the right side of the product and remove one screw.

Figure 1-23 Remove the right cover (1 of 2)

2. Slide the right cover toward the back of the product and remove it.

Figure 1-24 Remove the right cover (2 of 2)

NOTE: The right upper cover is attached to the right cover assembly and comes off with the right

cover assembly when the right cover assembly is removed.

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Lower back cover

At the back of the product, insert your finger into the hole in the cover and pull the cover outward to remove the lower back cover.

Figure 1-25 Remove the lower back cover

Rear-cover assembly

1. Before proceeding, remove the following:

●

Duplexer (if installed). See

●

Lower back cover. See

2. Open the rear-cover assembly.

Duplexer on page 74.

Lower back cover on page 18.

18 Chapter 1 Removal and replacement ENWW

3. Loosen two captive screws recessed in the product.

NOTE: The two captive screws loosen but do not come out.

Figure 1-26 Remove the rear–cover assembly (1 of 2)

4. Close the rear-cover.

5. Gently pull the bottom of the rear–cover assembly out, and then pull it up to remove it.

Top cover

1. Before proceeding, remove the following:

Figure 1-27 Remove the rear–cover assembly (2 of 2)

●

Right-cover assembly. See

●

Lower-back cover or duplexer. See

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Right cover assembly on page 17.

Lower back cover on page 18 or Duplexer on page 74.

●

SSA. See

Scanner subassembly (SSA) on page 37.

●

Rear-cover assembly. See

●

Left–cover. See

2. Open the print-cartridge door.

3. Remove four screws (callout 1), and then release one tab in the center of the product (callout 2).

Figure 1-28 Remove the top cover (1 of 2)

Left cover on page 21.

Rear-cover assembly on page 18.

4. Unhook two tabs on the front of the top cover and then remove the top cover.

Figure 1-29 Remove the top cover (2 of 2)

20 Chapter 1 Removal and replacement ENWW

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