Brother DCP-6690CW, Service Manual, Page: 4 / 506

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How this manual is organized
This manual is made up of nine chapters and appendices.
CHAPTER 1 PARTS NAMES AND FUNCTIONS
Contains external views and names of components and describes their functions. Information
about the keys on the control panel is included to help you check operation or make
adjustments.
CHAPTER 2 SPECIFICATIONS
Lists the specifications of each model, which enables you to make a comparison of different
models.
CHAPTER 3 THEORY OF OPERATION
Gives an overview of the scanning and printing mechanisms as well as the sensors, actuators,
and control electronics. It aids in understanding the basic principles of operation as well as
locating defects for troubleshooting.
CHAPTER 4 ERROR INDICATION AND TROUBLESHOOTING
Details error messages and codes that the incorporated self-diagnostic functions display if any
error or malfunction occurs. If any error message appears, refer to this chapter to find which
components 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. This will help service personnel pinpoint
and repair defective components.
CHAPTER 5 HANDLING DATA HELD IN THE MACHINE PRIOR TO
REPAIR
Describes how to handle data held in the machine to be repaired.
At the user site, if the machine cannot print FAX data received and left in the machine due to
the printing mechanism defective, the service personnel should instruct the end user to follow
the transfer procedure given in this chapter to transfer the FAX data to another machine before
sending the machine for repair.
At the service site, the service personnel should back up the machine information and user data
held in the machine into an external memory for restoration after repair, using the backup
procedure given in this chapter.
CHAPTER 6 DISASSEMBLY/REASSEMBLY AND LUBRICATION
Details procedures for disassembling and reassembling the machine together with related notes.
The disassembly order flow provided enables you to see at a glance the quickest way to get to
component(s) involved.
At the start of a disassembly job, you check the disassembly order flow that guides you through
a shortcut to the target components.
This chapter also covers screw tightening torques and lubrication points to which the specified
lubricants should be applied during reassembly jobs.