PREFACE; CHAPTER 1:; CHAPTER 2:- Page 3

PREFACE

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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-1030/1240/1250/1270N 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:

MAINTENANCE

Periodical replacements parts, consumable parts, etc.

CHAPTER 6:

TROUBLESHOOTING

Reference values and adjustments, troubleshooting image defects,
troubleshooting malfunctions, 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.