HP Laserjet 5 Service Manual

Printed on
Recycled Paper
*C3990-90991*
*C3990-90991*
C3990-90991
HP LaserJet 5L and 6L Printer
Service Manual
Copyright© 1997
Hewlett Packard Co.
Printed in USA 9/97Manual Part No.
C3990-90991
HP LaserJet 5L and 6L Printer (C3941/C3990) Service Manual 

Service Manual
HP LaserJet 5L HP LaserJet 6L
(C3941A) (C3990A) 

© Copyright Hewlett-Packard
Company 1997
All Rights Reserved.
Reproduction, adaptation, or
translation without prior
written permission is
prohibited, except as allowed
under the copyright laws.
Publication number
C3990-90991
First edition, May 1997Warranty
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 fitness for
a...

Conventions
This manual uses the following conventions:
Coloris used to emphasize items which are important to the material under
discussion.
The names of major printer parts and assemblies are CAPITALIZED.
Boldis used for emphasis, particularly in situations whereitalictype would be
confusing.
Italic typeis used to indicate related documents or emphasis.
NoteNotes contain important information set off from the text.
CautionCaution messages alert you to the possibility of damage to equipment or loss of...

Chapter Descriptions
1Product Information
Orientation to the printer, as well as the service and repair philosophy, is discussed.
Information on obtaining assistance and warranty is also here.
2Site Requirements
Here are recommendations pertaining to installation requirements.
3Operating Overview
This chapter has detailed information about the Control Panel. Sample self tests and
printer reset information are also included.
4Maintenance
Turn to this chapter for information about printer cleaning and...

List of Figures
Figure 1-1 HP LaserJet 5L Model and Serial Numbers . .  . .  . .  . .  . .  . . 1-4
Figure 1-2 HP LaserJet 6L Model and Serial Numbers . .  . .  . .  . .  . .  . .  . 1-5
Figure 1-3 Front/Side Views of the Printer . .  . .  . .  . .  . .  . .  . .  . .  . . 1-7
Figure 1-4 Front Door Assemblies . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . . 1-8
Figure 1-5 Back View of the Printer . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . . 1-9
Figure 2-1 Printer Space Requirements . .  . ....

Figure 6-24 Pickup Roller Assembly Removal (2 of 2) .  . .  . .  . .  . .  . . 6-28
Figure 6-25 Paper Pickup Roller Assembly Replacement (Inside/Front View) 6-29
Figure 6-26 Paper Feed Frame Removal (1 of 4) . .  . .  . .  . .  . .  . .  . . 6-30
Figure 6-27 Paper Feed Frame Removal (2 of 4) . .  . .  . .  . .  . .  . .  . . 6-31
Figure 6-28 Paper Feed Frame Removal (3 of 4) . .  . .  . .  . .  . .  . .  . . 6-32
Figure 6-29 Paper Feed Frame Removal (4 of 4) . .  . .  . .  . .  . .  . .  . . 6-33
Figure...

List of Tables
Table 1-1 Printer Features . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . . 1-3
Table 1-2 Paper Capacities and Sizes . .  . .  . .  . .  . .  . .  . .  . .  . .  . . 1-3
Table 1-3 Performance Specifications . .  . .  . .  . .  . .  . .  . .  . .  . .  . . 1-6
Table 1-4 Electrical Specifications . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . . 1-6
Table 1-5 Acoustic Emissions . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . . 1-6
Table 1-6 Related Documentation ....

viii 

1
Product Information
Contents
Printer Features .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . . 1-3
Paper Capacities and Sizes . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . . 1-3
Identification .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . . 1-4
Model and Serial .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . . 1-4
Specifications . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  ....