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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-5240/5250DN/5270DN/5280DW printers.
This manual consists of the following chapters:
CHAPTER 1: GENERAL
Features, specifications, etc.
CHAPTER 2: THEORY OF OPERATION
Basic operation of the mechanical system, the electrical system and the
electrical circuits.
CHAPTER 3: PERIODIC MAINTENANCE
Periodical replacement parts, consumable parts, etc.
CHAPTER 4: TROUBLESHOOTING
Reference values and adjustments, troubleshooting image defects,
troubleshooting malfunctions, etc.
CHAPTER 5: DISASSEMBLY AND RE-ASSEMBLY
Procedures for disassembling and re-assembling the mechanical
system.
CHAPTER 6: ADJUSTMENTS AND UPDATING OF SETTING, REQUIRED AFTER
PARTS REPLACEMENT
CHAPTER 7: SERVICE SUPPORT SOFTWARE
Test print mode and Service menu mode, etc.
APPENDIX: 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.
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