HP LaserJet 5L Service Manual.pdf

Service Manual

HP LaserJet 5L

(C3941A)

Company 1995

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

C3941-90987

First edition, September 1995

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.

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.

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.

iii

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 and care.

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. A 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 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 HP LaserJet 5L Model and Serial Numbers . . . . . . . . . . . 1-4

Figure 1-2 Front/Side Views of the Printer . . . . . . . . . . . . . . . . . . 1-6

Figure 1-3 Front Door Assemblies . . . . . . . . . . . . . . . . . . . . . . 1-7

Figure 1-4 Back View of the Printer . . . . . . . . . . . . . . . . . . . . . 1-8

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

Figure 2-2 Toner Cartridge Distribution . . . . . . . . . . . . . . . . . . . 2-6

Figure 3-1 Host-Based Printer Settings Options . . . . . . . . . . . . . . . 3-6

Figure 3-2 Host-Based Printing Status . . . . . . . . . . . . . . . . . . . . 3-7

Figure 3-3 PCL Printer Settings Options . . . . . . . . . . . . . . . . . . . 3-8

Figure 3-4 PCL Printing Status . . . . . . . . . . . . . . . . . . . . . . . 3-9

Figure 3-5 Self-test Page . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

Figure 3-6 Engine Test Button . . . . . . . . . . . . . . . . . . . . . . . . 3-16

Figure 4-1 Five Percent Text Coverage . . . . . . . . . . . . . . . . . . . 4-4

Figure 4-2 Static Eliminator Teeth . . . . . . . . . . . . . . . . . . . . . . 4-8

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

Figure 5-2 DC Controller Loads . . . . . . . . . . . . . . . . . . . . . . . 5-4

Figure 5-3 EconoMode vs Normal Mode . . . . . . . . . . . . . . . . . . 5-10

Figure 5-4 Image Formation Block Diagram . . . . . . . . . . . . . . . . 5-12

Figure 5-5 Simplified Paper Path . . . . . . . . . . . . . . . . . . . . . . . 5-16

Figure 5-6 Solenoid and Sensors . . . . . . . . . . . . . . . . . . . . . . . 5-17

Figure 5-7 General Timing Diagram . . . . . . . . . . . . . . . . . . . . . 5-20

Figure 6-1 Phillips and Posidriv screwdrivers . . . . . . . . . . . . . . . . 6-4

Figure 6-2 Back Cover Removal (1 of 2) . . . . . . . . . . . . . . . . . . 6-6

Figure 6-3 Back Cover Removal (2 of 2) . . . . . . . . . . . . . . . . . . 6-7

Figure 6-4 EP Door Assembly Removal . . . . . . . . . . . . . . . . . . . 6-8

Figure 6-5 Memory Door Removal . . . . . . . . . . . . . . . . . . . . . 6-9

Figure 6-6 Main Cover and Paper Input Assembly Removal . . . . . . . . 6-10

Figure 6-7 Control Panel Removal . . . . . . . . . . . . . . . . . . . . . . 6-11

Figure 6-8 Exit Roller Removal . . . . . . . . . . . . . . . . . . . . . . . 6-12

Figure 6-9 Delivery Assembly Removal (1 of 2) . . . . . . . . . . . . . . 6-13

Figure 6-10 Delivery Assembly Removal (2 of 2) . . . . . . . . . . . . . . 6-14

Figure 6-11 Fuser Pressure Plate Removal . . . . . . . . . . . . . . . . . . 6-15

Figure 6-12 Fuser Pressure Plate Replacement . . . . . . . . . . . . . . . . 6-16

Figure 6-13 Heating Element Removal (1 of 3) . . . . . . . . . . . . . . . . 6-17

Figure 6-14 Heating Element Removal (2 of 3) . . . . . . . . . . . . . . . . 6-18

Figure 6-15 Heating Element Removal (3 of 3) . . . . . . . . . . . . . . . . 6-19

Figure 6-16 Pressure Roller Removal . . . . . . . . . . . . . . . . . . . . . 6-20

Figure 6-17 Face-Up/Face-Down Lever Replacement . . . . . . . . . . . . 6-21

Figure 6-18 Fuser Exit Roller Removal . . . . . . . . . . . . . . . . . . . . 6-22

Figure 6-19 Paper Exit Sensor Flag Replacement . . . . . . . . . . . . . . . 6-23

Figure 6-20 Laser/Scanner Assembly Removal . . . . . . . . . . . . . . . . 6-24

Figure 6-21 Solenoid Removal (1 of 2) . . . . . . . . . . . . . . . . . . . . 6-25

Figure 6-22 Solenoid Removal (2 of 2) . . . . . . . . . . . . . . . . . . . . 6-26

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