This service manual contains basic information required for after-sales service of the laser
printer (hereinafter referred to as "the machine"). This information is vital to the service
personnel to maintain the high printing quality and performance of the machine.
This service manual covers the HL-4040CN/4040CDN/4050CDN/4070CDW machines.
This manual consists of the following chapters:
CHAPTER 1: TROUBLESHOOTING
Details of error messages and codes that the incorporated self-diagnostic function of the
machine will display if any error or malfunction occurs. If any error message appears, refer
to this chapter to find which parts should be checked or replaced.
The latter half of this chapter provides sample problems that could occur in the main
sections of the machine and related troubleshooting procedures.
CHAPTER 2: PERIODICAL MAINTENANCE
Details of consumable parts and periodical maintenance parts. This chapter also covers
procedures for disassembling and assembling periodical maintenance parts.
CHAPTER 3: DISASSEMBLY AND ASSEMBLY
Details of procedures for disassembling and assembling of the machine together with
related notes. The disassembly order flow provided enables you to see at a glance the
quickest way to get to parts involved.
At the start of a disassembly job, you can check the disassembly order flow that guides you
through a shortcut to get to the object parts.
This chapter also covers screw tightening torques and lubrication points to which the
specified lubrications should be applied during assembly jobs.
CHAPTER 4: ADJUSTMENTS AND UPDATING OF SETTINGS,
REQUIRED AFTER PARTS REPLACEMENT
Details of adjustments and updating of settings, which are required if the main PCB and
some other parts have been replaced. This chapter also covers how to update the
firmware.
CHAPTER 5: SERVICE FUNCTIONS
Describes the maintenance mode which is exclusively designed for the purpose of
checking the settings and adjustments using the keys on the panel.
This chapter also covers hidden function menus, which activate settings and functions or
reset the parts life.
CHAPTER 6: CIRCUIT DIAGRAMS, WIRING DIAGRAM
Provides the Circuit Diagrams and Wiring Diagram for the connections of the PCBs.
PREFACE
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