Image Distortion - Brother 09055CDN Service Manual

■ Completely blank
<User Check>
Step
1 Developing bias voltage
conduction failure
2 Dirt on developer roller
electrode
3 Laser unit assembling failure
4 High-voltage power supply
PCB failure
5 Laser unit failure
6 Main PCB failure

■ Image distortion

<User Check>
Step
1 Laser unit assembling failure
2 Main PCB failure
- Replace the belt unit with a new one.
- Replace the toner cartridge or drum unit with a new one.
Cause
- Replace the belt unit with a new one.
Cause
2-116
Remedy
Clean the electrodes of the drum unit and
main body. (Refer to Fig. 2-10 (P2-62)
Fig. 2-13 (P2-63))
Clean the electrodes of the developer roller
and main body. (Refer to
and Fig. 2-13 (P2-63))
Re-assemble the laser unit.
Replace the high-voltage power supply PCB
ASSY.
Replace the laser unit.
Replace the main PCB ASSY.
Remedy
Re-assemble the laser unit.
Replace the main PCB ASSY.
and
Fig. 2-10 (P2-62)
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