Chapter 2 Error Indication And Troubleshooting; Introduction; Precautions - Brother HL-S7000DN Service Manual

CHAPTER 2 ERROR INDICATION AND
1.

INTRODUCTION

Troubleshooting is the countermeasure procedures that the service personnel should follow if
an error or malfunction occurs with the machine. It is impossible to anticipate all of the
possible troubles which may occur in future and determine the troubleshooting procedures, so
this chapter covers some sample troubles. However, those samples will help the service
personnel pinpoint and repair other defective elements.
1.1

Precautions

Be sure to observe and follow all the precautions to prevent any secondary problems from
happening during troubleshooting.
(1) Always turn off the power and unplug the power cable before removing any covers or
PCBs, adjusting the machine and so on. If you need to take voltage measurements with
the power switched on, take the greatest of care not to receive an electric shock.
(2) When connecting or disconnecting cable connectors, make sure that you hold the
connector body and not the cables.
(3) Static electricity charged in your body may damage electronic parts. Before handling the
PCBs, touch a metal portion of the machine to discharge static electricity charged in your
body. When transporting PCBs, be sure to wrap them in conductive sheets.
When replacing the PCBs, put on a grounding wrist band and perform the job on a
conductive mat.
Also take care not to touch the conductor sections on the flat cables.
(4) Follow the warning by all means.
(5) Verify again that the repaired portion works properly.
(6) After disconnecting flat cables, check that each cable is not damaged at its end or
shortcircuited. When connecting flat cables, do not insert them at an angle. After
insertion, check that the cables are not at an angle.
(7) When ink gets on to the skin or gets into the eyes or mouth, perform the following
treatment.
- Immediately wash away the ink on the skin with water or soap.
- When ink gets into the eyes, immediately wash away with water. If it is untreated, red
eye or light inflammation may occur. When error is found, consult with doctor
immediately.
- When ink gets into mouth, immediately spit it out and consult with a doctor immediately.
(8) After an assembly, recommend the operation of "dielectric strength voltage check" and
"continuity check".
(9) Platen head will start head capping operation 5 seconds after completion of printing.
It will require 5 to 10 seconds for capping operation to finish. If the power-supply cord of
the machine is disconnected before the head capping operation is completed, the quality
of the print head decreases. When disconnecting the power-supply cord, wait until the
mechanical operation is finished.
(10) When returning the machine to a user, make sure that capping is done.
TROUBLESHOOTING
2-1
Confidential