PREFACE
This service manual contains basic information required for after-sales service of the laser printer (here-
in-after referred to as "this machine" or "the printer"). This information is vital to the service technical in
maintaining the high printing quality and performance of the printer.
This service manual covers both HL-630 / HL-631/ HL-641,645 / 650 / 655M.
This manual consists of the following chapters:
CHAPTER I
:
FEATURES AND SPECIFICATIONS
Features, specifications, and operation.
CHAPTER II
:
THEORY OF OPERATION
Basic operation of the mechanical system, the electrical system and the electrical
circuit, and their timing.
CHAPTER III
:
DISASSEMBLY AND REASSEMBLY
Procedures of disassembling and reassembling the mechanical system.
CHAPTER IV
:
TROUBLESHOOTING
Reference values and adjustment, troubleshooting for image defects, troubleshooting
for malfunctions, etc.
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 through understanding of this printer, based on information on this service manual and service
information bulletins, is required for maintaining its quality performance and fostering the practical ability
to find the cause of troubles.
