White Spots - Brother DCP-8110DN Service Manual

White spots

<User Check>
- Turn ON the power switch, and open the front cover and the back
- Select "Improve Toner Fixing" in the driver.
- When the white spots appear at intervals of 45.3 mm, replace the
- Refer to the User's Guide to remove the dirt from the exposure drum
- When the white spots appear at intervals of 94.2 mm, replace the
Step
Dirt on the paper dust cleaning
1
roller of the paper tray
Dirt on electrodes of the drum unit
2 and those of the machine
Dirt on electrodes of the toner
3 cartridge and those of the machine
4 Relay front PCB failure
Toner sensor failure
5
High-voltage power supply PCB
6
failure
7 Main PCB failure
cover. Leave the machine for a while to remove condensation.
toner cartridge with a new one.
using a cotton applicator.
drum unit with a new one.
Cause
Paper dust cleaning roller
Fig. 2-14
2-82
Remedy
Refer to the illustration below to clean the
paper dust cleaning roller.
Clean the electrodes of the drum unit and
those of the machine. (Refer to
Fig. 2-11.)
Clean the electrodes of the toner cartridge
and those of the machine. (Refer to
10 or Fig. 2-11.)
Replace the relay front PCB ASSY.
Refer to "1.3.10 Check sensor operation
(function code: 32)" in Chapter 5
the sensor operation. If the sensor operation
is faulty, replace the toner sensor PCB
ASSY.
Replace the high-voltage power supply PCB
ASSY.
Replace the main PCB ASSY.
Fig. 2-10 or
Fig. 2-
to check
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