Brother International HL 1850 Service Manual - Page 3

Preface

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HL-1850/1870N SERVICE MANUAL PREFACE This service manual contains basic information required for after-sales service of the laser printer (hereinafter referred to as "this machine" or "the printer"). This information is vital to the service technician to maintain the high printing quality and performance of the printer. This service manual covers the HL-1850/1870N printers. This manual consists of the following chapters: CHAPTER 1: GENERAL Features, specifications, etc. CHAPTER 2: INSTALLATION AND BASIC OPERATION Installation conditions, Installation procedures, basic operation of the printer etc. CHAPTER 3: THEORY OF OPERATION Basic operation of the mechanical system, the electrical system and the electrical circuits and their timing information. CHAPTER 4: DISASSEMBLY AND RE-ASSEMBLY Procedures for disassembling and re-assembling the mechanical system. CHAPTER 5: PERIODIC MAINTENANCE Periodical replacements parts, consumable parts, etc. CHAPTER 6: TROUBLESHOOTING Reference values and adjustments, troubleshooting image defects, troubleshooting malfunctions, etc. CHAPTER 7: HIDDEN FUNCTIONS Professional menu mode and Service menu mode, etc. APPENDICES: Serial No. descriptions, Drum life & page counter, Diameter / circumference of rollers, Connection diagrams, PCB circuit diagrams, etc. Information in this manual is subject to change due to improvement or redesign of the product. All relevant information in such cases will be supplied in service information bulletins (Technical Information). A thorough understanding of this printer, based on information in this service manual and service information bulletins, is required for maintaining its print quality performance and for improving the practical ability to find the cause of problems. i

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HL
-1850/1870N
SERVICE
MANUAL
PREFACE
This
service
manual
contains
basic
information
required
for
after
-sales
service
of
the
laser
printer
(hereinafter
referred
to
as
"this
machine"
or
"the
printer").
This
information
is
vital
to
the
service
technician
to
maintain
the
high
printing
quality
and
performance
of
the
printer.
This
service
manual
covers
the
HL
-1850/1870N
printers.
This
manual
consists
of
the
following
chapters:
CHAPTER
1:
GENERAL
Features,
specifications,
etc.
CHAPTER
2:
INSTALLATION
AND
BASIC
OPERATION
Installation
conditions,
Installation
procedures,
basic
operation
of
the
printer
etc.
CHAPTER
3:
THEORY
OF
OPERATION
Basic
operation
of
the
mechanical
system,
the
electrical
system
and
the
electrical
circuits
and
their
timing
information.
CHAPTER
4:
DISASSEMBLY
AND
RE
-ASSEMBLY
Procedures
for
disassembling
and
re
-assembling
the
mechanical
system.
CHAPTER
5:
PERIODIC
MAINTENANCE
Periodical
replacements
parts,
consumable
parts,
etc.
CHAPTER
6:
TROUBLESHOOTING
Reference
values
and
adjustments,
troubleshooting
image
defects,
troubleshooting
malfunctions,
etc.
CHAPTER
7:
HIDDEN
FUNCTIONS
Professional
menu
mode
and
Service
menu
mode,
etc.
APPENDICES:
Serial
No.
descriptions,
Drum
life
&
page
counter,
Diameter
/
circumference
of
rollers,
Connection
diagrams,
PCB
circuit
diagrams,
etc.
Information
in
this
manual
is
subject
to
change
due
to
improvement
or
redesign
of
the
product.
All
relevant
information
in
such
cases
will
be
supplied
in
service
information
bulletins
(Technical
Information).
A
thorough
understanding
of
this
printer,
based
on
information
in
this
service
manual
and
service
information
bulletins,
is
required
for
maintaining
its
print
quality
performance
and
for
improving
the
practical
ability
to
find
the
cause
of
problems.
i