Unstable Color Density; Hollow Print - Brother MFC-9130CW Service Manual

■ Unstable color density

<User Check>
Step
1 Dirt on drum unit electrode
2 Dirt on toner cartridge
electrode
3 Dirt on belt unit electrode
4 LED ASSY failure
5 High-voltage power supply
PCB failure
6 Main PCB failure

■ Hollow print

<User Check>
Step
1 Dirt in the paper dust cleaning
roller
2 Scratch and dirt on fuser unit
3 High-voltage power supply
PCB failure
- Check the machine's environment. High temperature and high
humidity or low temperature and low humidity conditions can cause this
problem.
- Replace the belt unit with a new one.
- Replace the drum unit or toner cartridge with a new one.
- Replace the waste toner box with a new one.
Cause
- Check the machine's environment. High temperature and high
humidity or low temperature and low humidity conditions can cause this
problem.
- Refer to the User's guide and remove the dirt on the exposure drum
using a cotton swab.
- Replace the drum unit or toner cartridge with a new one.
Cause
2-101
Remedy
Clean the electrodes of the main body and
drum unit. (Refer to fig. 2-7 (P2-50)
fig. 2-8 (P2-51))
Clean the electrodes of the main body and
toner cartridge. (Refer to
fig. 2-8 (P2-51))
Clean the electrodes of the main body and
belt unit. (Refer to fig. 2-7 (P2-50)
fig. 2-10 (P2-53))
Replace the LED ASSY.
Replace the high-voltage power supply PCB
ASSY.
Replace the main PCB ASSY.
Remedy
Remove paper dust attached on the paper
dust cleaning roller.
(Refer to fig. 2-14 (P2-97))
Replace the fuser unit.
Replace the high-voltage power supply PCB
ASSY.
and
fig. 2-7 (P2-50) and
and
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