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Combined Service Manual
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HP DOC
HP LaserJet 4L/ 4ML
(C2003A/ C2015A)
HP LaserJet 4P/ 4MP
(C2005A/ C2040A)
Copyright Hewlett- Warranty WARNING
Packard Company 1993 The information contained Electrical Shock Hazard
in this document is subject To avoid electrical shock,
All Rights Reserved. Repro- to change without nc,tice. use only supplied power
duction, adaptation, or
Hewlett-Packard makes cords and connect only to
ranslation without prior
no warranty of any kind properly grounded (3-hole)
written pmnnssionis pro-
with regard to this mate- wall outlets.
hibited, except as allowed
under the copyright laws. rial, including, but not
limited to, the implied
Publication number warranties or merchant-
C2005-90988 ability and fitness for a
particular purpose.
First edition, August 1993
Hewlett-Packard shall not
Second edition, March 1994 be liable for errors cm-
Printed in USA tained herein or for inciden-
tal or consequential
damaged in connecti~m
with the furnishing, per-
formance, or use of this ma-
terial.
Hewlett-Packard Company
1311 Chinden Boulevard
Boise, Idaho 83714
Conventions
This manual uses the following conventions:
Unless specifically stated otherwise, information applies to all four
printer models (LaserJet 4L/4ML/4P/4MP), Most procedures are com-
bined 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 confusing.
Italic type is used to indicate related documents or emphasis.
COME'UTER type indicates text as seen on a computer monitor.
Di ;W.-ii'+type indicates text as seen on the printer's 16 character LCD
display panel (LaserJet 4P/4MP only).
~ indicates keys on a computer keyboard or on the printer's
control panel (LaserJet 4P/4MP only). Examples include ~ and
m.
," Notes contain important information set off from
the text.
i,, 21.JII[,
!'J 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.
A detailed matrix of printer features is followed by general
information on the four printer models. Specifications, major
assembly locations, safety and regulatory information are all
included. The chapter ends with a discussion of the service
and repair philosophy along with useful information on
obtaining technical help.
Recommendations pertaining to the physical location of the
printer and consumables are followed by general print media
specifications (including specifications for paper, envelopes,
labels and transparencies).
Chapter 3 provides the step-by-step installation and setup
procedure, along with detailed information on using the
Control Panel for each printer model. Sample self tests and
printer reset information are also included.
Turn to this chapter for information on routine printer
maintenance, including consumables and printer cleaning
procedures. Paper jam procedures are also included.
Here you will find the basic theory-of-operation information
required to understand the various printer systems and how
they function together.
This chapter contains the step-by-step procedures for
replacing all the printer's field replaceable units (FRUS).
Assemblies are grouped by physical location in the printer.
...
Turn to Chapter 7 for diagnosing and troubleshooting printer
problems. Start with the general troubleshooting flowchart,
referencing the paper path and printer component location
diagrams for assistance. Error message tables and image
defect samples are followed by engine test and other
diagnostic procedures. The chapter ends with more
troubleshooting tools such as an image defect ruler and
wiring diagram.
I-Jse Chapter 8 to find any field replaceable unit (FRU) in the
printers. Exploded view drawings are accompanied by
complete part number and description tables.
The parts index is a convenient tool for looking up any field
replaceable unit (FRU). All parts are sorted both by part
number and by part name. Parts are cross-referenced to their
corresponding exploded view illustrations in Chapter 8.
This appendix contains cabling and pin-out information for
the serial, parallel and LocalTalk interfaces which are
supported by the printers.
lJse the subject index to quickly locate any information in the
manual.
Fig l-l Sample Model and Serial Number Labels