Troubleshooting According To Image Defect - Brother DCP-L5500D Service Manual

4.3.2 Troubleshooting according to image defect

End users can solve problems related to image defect as long as they follow the User Check
items. If the problem still cannot be solved, implement each procedure according to the step
numbers in the tables below.
 Light
Step
Dirt on the electrodes of the drum
1 unit and those of the machine
Dirt on the electrodes of the toner
2 cartridge and those of the machine
Dirt on the electrodes of the
3
machine
4 Fuser unit failure
High-voltage power supply PCB
5
failure
6 Main PCB failure
7 Laser unit failure
<User Check>
• Check the usage environment of the machine. Using the machine in
hot-humid or cold-dry conditions can cause this problem.
• If the whole page is light, toner save mode may be ON. Turn OFF
the toner save mode.
• Replace the drum unit with a new one.
• Replace the toner cartridge with a new one.
• Turn ON the power switch, and leave the machine for a while
(condensation).
• Check that the paper is not damp.
• Use specified paper.
Cause
2-96
Remedy
Clean the electrodes of the drum unit and
those of the machine. (Refer to
Fig. 2-9.)
Clean the electrodes of the toner cartridge
and those of the machine. (Refer to
and Fig. 2-9.)
Clean the electrodes of the machine.
(Refer to Fig. 2-9.)
Replace the fuser unit.
Replace the high-voltage power supply PCB
ASSY.
Replace the main PCB ASSY.
Replace the laser unit.
Fig. 2-8 and
Fig. 2-8
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