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HP Laserjet 4 Manual

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Page 1

Combined Service
Manual
HP LaserJet 4 / 4M
(C2001A / C2021A)
HP LaserJet 4 Plus /
4M Plus
(C2037A / C2039A)
HP LaserJet 5 / 5M
/5N
(C3916A/C3917A/
C3952A) 

Page 2

© Copyright
Hewlett-Packard
Company 1996
All Rights Reserved.
Reproduction, adaptation,
or translation without
prior written permission
is prohibited, except as
allowed under the
copyright laws.
Publication number
C3916-90984
First edition, March 1996
Printed in USAWarranty
The information
contained in this
document is subject to
change without notice.
Hewlett-Packard makes
no warranty of any kind
with regard to this
material, including, but
not limited to, the
implied warranties or
merchantability and...

Page 3

Conventions
This manual uses the following conventions:
Unless specifically stated otherwise, information applies to all
seven printer models (LaserJet 4/4 Plus/4 M/4 M Plus/5/5 M/5 N).
Most procedures are combined for all printers, except where they
differ substantially.
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...

Page 4

ii 

Page 5

Contents
1Product Information
Product Family Information  .  .  .  .  .  .  .  .  .  .  .  .  .  .  . 1-2
Identification      .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  . 1-3
Specifications   .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  . 1-5
HP LaserJet 4 and 4 Plus  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  . 1-5
Related Documentation     .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  . 1-7
Safety Information  .  .  .  .  .  .  .  .  .  .  .  .  ....

Page 6

Control Panel Keys    .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  3-2
Reset Menu   .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  3-5
Control Panel Menus  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  3-6
Printer Features .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  3-13
Page Protection (HP LaserJet 4 only)  .  .  .  .  .  .  .  .  .  3-13
Resource Saving (HP LaserJet 4 Plus and 5 only)  .  .  3-14
I/O Buffering (HP LaserJet 4 Plus and 5...

Page 7

Printer Drivers .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  3-41
Install Printer Drivers and Utilities   .  .  .  .  .  .  .  .  .  3-41
How to Obtain Printer Drivers  .  .  .  .  .  .  .  .  .  .  .  .  .  3-41
DOS Utilities  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  3-42
Packing the Printer    .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  3-43
Repackaging Instructions     .  .  .  .  .  .  .  .  .  .  .  .  .  .  3-43
Packing Checklist...

Page 8

Removing the Transfer Roller     .  .  .  .  .  .  .  .  .  .  .  .  4-16
Replacing the Transfer Roller     .  .  .  .  .  .  .  .  .  .  .  .  4-16
5Functional Overview
Introduction  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  5-1
DC Controller System  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  5-2
DC Controller Loads  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  5-3
Serial Data Communication  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  5-4...

Page 9

6Removal and Replacement
Required Tools  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  . 6-2
Hardware Review  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  . 6-2
Removing the Covers   .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  . 6-4
Right Side Cover Removal  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  . 6-4
Top Cover Removal   .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  . 6-5
Left Side Cover Removal   .  .  .  .  .  .  .  .  .  .  .  .  ....

Page 10

Removing the High Voltage Contact Assembly and
Feed Guide Assembly  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  6-67
Replacing the High Voltage Contact
Assembly/Feed Guide Assembly   .  .  .  .  .  .  .  .  .  .  6-68
Interconnect PCA Removal   .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  6-69
7Troubleshooting
LaserJet 5 Error Map  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  7-A
Pre-Troubleshooting Procedures    .  .  .  .  .  .  .  .  .  .  .  .  .  7-1
Preliminary Operating Checks...
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