Image Distortion; All One Color - Brother MFC-9130CW Service Manual

■ Image distortion

<User Check>
Step
1 LED ASSY installation failure
2 LED ASSY failure
3 Main PCB failure

■ All one color

<User Check>
- Clean the corona wire of each drum unit for all four colors.
- Replace the drum unit with a new one.
Step
1 Dirt on the GRID electrodes of
the main body or drum unit
2 Flat cable connection failure
of the LED ASSY
3 LED flat cable failure
4 LED control PCB failure
5 High-voltage power supply
PCB failure
6 LED ASSY failure
7 Main PCB failure
- Replace the belt unit with a new one.
Cause
Cause
2-92
Remedy
Install the LED ASSY properly and tighten
screws securely.
Replace the LED ASSY.
Replace the main PCB ASSY.
Remedy
Clean the GRID electrodes of the main body
or drum unit. (Refer to
fig. 2-8 (P2-51))
Reconnect the flat cable of LED ASSY
correctly.
Replace the LED flat cable.
Replace the LED control PCB ASSY.
Replace the high-voltage power supply PCB
ASSY.
Replace the LED ASSY.
Replace the main PCB ASSY.
fig. 2-7 (P2-50) and
Confidential