Pitch Indicated In Roller Image; Troubleshooting Image Defect - Brother DCP-9055CDN Service Manual

3.6.2

Pitch indicated in roller image

Image defects which occur periodically may be caused by a failure of the roller. By referring to
the table below, specify the cause based on the pitch indicated in the image of each roller.
No.
1 Developer roller
2 Exposure drum
3 Heat roller in the fuser unit
4 Pressure roller in the fuser unit
3.6.3

Troubleshooting image defect

Image defect related problems are user recoverable if following the User Check items. If the
same problem occurs, follow each procedure in the order of the number described in the Step
column in the tables below.
■ Light on the whole page
Step
1
2
3
4
5
Parts name
<User Check>
- Check the machine's environment. High temperature and high
humidity or low temperature and low humidity conditions can cause this
problem.
- If the whole page is light, toner save mode may be on. Turn off the
toner save mode.
- Wipe the scanner windows of the laser unit with a soft, lint-free cloth.
(Refer to the figure below.)
- Adjust the color calibration from the control panel.
- Replace the toner cartridge or drum unit with a new one.
- Adjust the color density from the control panel.
- Leave the machine for a while as the power remains ON.
Cause
High-voltage power supply
PCB failure
Engine PCB failure
Main PCB failure
Laser unit failure
Registration mark sensor
PCB failure
The pitch which appears in the image
Replace the high-voltage power supply PCB
ASSY.
Replace the engine PCB ASSY.
Replace the main PCB ASSY.
Replace the laser unit.
Replace the registration mark sensor holder
ASSY.
Fig. 2-16
2-111
30 mm
94 mm
78.5 mm
78.5 mm
Remedy
Confidential