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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
in maintaining the high printing quality and performance of the printer.
This manual consists of the following chapters:
Chapter I : General
Features, specifications, etc.
Chapter II : Theory of Operation
Basic operation of the mechanical system and the electrical system, and their timing.
Chapter III : Electrical System
Theory of the electronics circuit
Chapter IV : Mechanical System
Requirements for a suitable location, disassembling and reassembling procedure of
mechanical system.
Chapter V : Maintenance and Servicing
Parts replacement schedule, list of tools, lubricants and cleaners.
Chapter VI : Troubleshooting
Reference values and adjustment, troubleshooting for image defects, troubleshooting
for malfunctions, etc.
Appendices : Engine Block Diagram, PCB Circuitry Diagrams, etc.
Note: This service manual of the printer (HL-1260e/HL-1660) describes only different parts from
the each part of the service manual (No.54T039NE0) which was published before. We
omit the same parts with that of HL-1260 and describe the effect of it in contents. When
you find the omitted parts, please refer to the service manual of that model.
Information in this manual is subject to change due to improvement or re-design 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 quality performance and for fostering the practical ability
to find the cause of troubles.