White Spots; Black Spots - Brother HL-1110 Service Manual

4.2.15 White spots

Step
Dirt on electrodes of the drum unit
1 and those of the machine
Dirt on electrodes of the toner
2 cartridge and those of the machine
High voltage power supply PCB
3
failure
4 Main PCB failure

4.2.16 Black spots

Step
Dirt on electrodes of the drum unit
1 and those of the machine
Dirt on electrodes of the toner
2 cartridge and those of the machine
Scratch or dirt on the heat unit, or
3
dirt on the pressure roller
High voltage power supply PCB
4
failure
5 Main PCB failure
<User Check>
- Turn ON the power switch, then open the top cover. Leave the
machine for a while to remove condensation.
- Replace the toner cartridge with a new one.
- Replace the drum unit with a new one.
Cause
<User Check>
- This problem may disappear after printing multiple sheets of paper.
When the machine has not been used for long periods of time, try
printing several sheets of paper.
- Replace the toner cartridge with a new one.
- Replace the drum unit with a new one.
Cause
1-26
Remedy
Clean the electrodes of the drum unit and
those of the machine. (Refer to
Fig. 1-7.)
Clean the electrodes of the toner cartridge
and those of the machine. (Refer to
or Fig. 1-7.)
Replace the high voltage power supply PCB
ASSY.
Replace the main PCB ASSY.
Remedy
Clean the electrodes of the drum unit and
those of the machine. (Refer to
Fig. 1-7.)
Clean the electrodes of the toner cartridge
and those of the machine. (Refer to
or Fig. 1-7.)
Replace the fuser unit.
Replace the high voltage power supply PCB
ASSY.
Replace the main PCB ASSY.
Fig. 1-6 or
Fig. 1-6
Fig. 1-6 or
Fig. 1-6
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