HP LaserJet 4V and 4MV.pdf

Service Manual

HP LaserJet 4V / 4MV

(C3141A / C3142A)

Hewlett-Packard Company

1994

Warranty

The information contained

in this document is subject

to change without notice.

WARNING

Electrical Shock Hazard

Reproduction, adaptation, or

translation without prior

written permission is

prohibited, except as

allowed under the copyright

laws.

To avoid electrical shock,

use only supplied power

cords and connect only to

properly grounded (3-hole)

wall outlets.

Hewlett-Packard makes no

warranty of any kind with

regard to this material,

including, but not limited to,

the implied warranties or

merchantability and fitness

for a particular purpose.

Publication number

C3141-90929

Hewlett-Packard shall not

be liable for errors contained

herein or for incidental or

consequential damaged in

connection with the

furnishing, performance, or

use of this material.

First edition, July 1994

Printed in USA

Hewlett-Packard Company

11311 Chinden Boulevard

Boise, Idaho 83714

Conventions

This manual uses the following conventions:

Color is used to emphasize items which are important to the material under

discussion.

The names of major printer parts and assemblies are Capitalized.

Bold is used for emphasis, particularly in situations where italic type would

be confusing.

Italic type is used to indicate related documents or emphasis.

COMPUTER type indicates text as seen on a computer monitor.

[Keyface] indicates keys on a computer keyboard or on the printer control

panel. Examples include [Form Feed] , [Enter] and [On Line] .

NOTE

Notes contain important information set off from the text.

CAUTION

Caution messages alert you to the possibility of damage to equipment or

loss of data.

WARNING!

Warning messages alert you to the possibility of personal injury.

Chapter Descriptions

1 Product Information

Orientation to the printer, as well as the service and repair philosophy is

discussed. Information on obtaining assistance and warranty is also here.

2 Site Requirements

Here are recommendations pertaining to installation requirements.

3 Operating Overview

This chapter has detailed information about the Control Panel. Sample self

tests and printer reset information are also included.

4 Maintenance

Turn to this chapter for information about printer cleaning.

5 Functional Overview

Here you will find the basic theory-of-operation information required to

understand the various printer systems and how they function together.

6 Removal and Replacement

This chapter contains the step-by-step procedures for replacing printer field

replaceable units (FRUs). Assemblies are grouped by location in the printer.

7 Troubleshooting

Diagnose printer problems here. Preliminary troubleshooting table is

followed by error messages, image defect samples, and diagnostic tools.

8 Parts and Diagrams

Look here to find any field replaceable unit (FRU) in the printer. Exploded

view drawings are accompanied by complete part number tables.

A Parts Index

All parts are sorted and cross-referenced here by part number and name.

B I/O Information

This appendix contains cabling and pin-out information for parallel and

LocalTalk interfaces which are supported by the printer.

C Regulatory Information

Here are required statements regarding RFI and laser safety.

Subject Index

Use the subject index to quickly locate any information in the manual.

List of Figures

Figure 1-1 Sample Model and Serial Number Labels . . . . . . . . . . 1-5

Figure 1-2 Front and Rear Side View . . . . . . . . . . . . . . . . . . 1-11

Figure 1-3 Rear and Left Side View . . . . . . . . . . . . . . . . . . . 1-12

Figure 1-4 Front View with Front Cover Open . . . . . . . . . . . . . 1-13

Figure 1-5 Internal Assembly Locations (1 of 2) . . . . . . . . . . . . . 1-14

Figure 1-6 Internal Assembly Locations (2 of 2) . . . . . . . . . . . . . 1-15

Figure 1-7 Sample 5% Page Coverage . . . . . . . . . . . . . . . . . . 1-17

Figure 2-1 Printer Space Requirements . . . . . . . . . . . . . . . . . 2-4

Figure 3-1 Control Panel Layout . . . . . . . . . . . . . . . . . . . . . 3-3

Figure 3-2 Service Mode Menus . . . . . . . . . . . . . . . . . . . . . 3-16

Figure 3-3 Self Test Printout (printed in Service Mode) . . . . . . . . 3-21

Figure 3-4 Engine Test . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22

Figure 5-1 Printer Functional Block Diagram . . . . . . . . . . . . . . 5-3

Figure 5-2 Power Supply/Power Distribution . . . . . . . . . . . . . . 5-4

Figure 5-3 Formatter PCA Block Diagram . . . . . . . . . . . . . . . 5-10

Figure 5-4 EconoMode vs Normal Mode . . . . . . . . . . . . . . . . . 5-12

Figure 5-5 Image Formation Block Diagram . . . . . . . . . . . . . . 5-17

Figure 5-6 Photosensitive Drum . . . . . . . . . . . . . . . . . . . . . 5-18

Figure 5-7 Drum Cleaning . . . . . . . . . . . . . . . . . . . . . . . . 5-19

Figure 5-8 Primary Charging Roller . . . . . . . . . . . . . . . . . . . 5-20

Figure 5-9 Image Writing . . . . . . . . . . . . . . . . . . . . . . . . . 5-21

Figure 5-10 Image Development . . . . . . . . . . . . . . . . . . . . . . 5-22

Figure 5-11 Image Transferring . . . . . . . . . . . . . . . . . . . . . . 5-23

Figure 5-12 Image Fusing . . . . . . . . . . . . . . . . . . . . . . . . . 5-24

Figure 5-13 Paper Path . . . . . . . . . . . . . . . . . . . . . . . . . . 5-25

Figure 5-14 Clutches and Sensors . . . . . . . . . . . . . . . . . . . . . 5-26

Figure 5-15 General Timing Diagram . . . . . . . . . . . . . . . . . . . 5-29

Figure 6-1 Phillips vs. Posidriv Screwdrivers . . . . . . . . . . . . . . 6-4

Figure 6-2 Removing the Control Panel . . . . . . . . . . . . . . . . . 6-8

Figure 6-3 Upper Cover . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9

Figure 6-4 Static Charge Eliminator . . . . . . . . . . . . . . . . . . . 6-10

Figure 6-5 Removing Side Covers . . . . . . . . . . . . . . . . . . . . 6-11

Figure 6-6 Removing Rear Cover . . . . . . . . . . . . . . . . . . . . . 6-12

Figure 6-7 Exhaust Fan . . . . . . . . . . . . . . . . . . . . . . . . . 6-13

Figure 6-8 High Voltage Power Supply PCA . . . . . . . . . . . . . . 6-14

Figure 6-9 Cassette Size Sensor Assembly . . . . . . . . . . . . . . . 6-15

Figure 6-10 Card Cage . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16

Figure 6-11 Rear Exhaust Fan . . . . . . . . . . . . . . . . . . . . . . 6-17

Figure 6-12 Power Supply Unit . . . . . . . . . . . . . . . . . . . . . . 6-18

Figure 6-13 DC Controller PCA . . . . . . . . . . . . . . . . . . . . . . 6-19

Figure 6-14 Laser/Scanner Assembly . . . . . . . . . . . . . . . . . . . 6-20

Figure 6-15 Main Motor . . . . . . . . . . . . . . . . . . . . . . . . . . 6-21

Figure 6-16 Main Drive Assembly Removal (1 of 2) . . . . . . . . . . . 6-22

iii

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