Brother HL-1112 - Black Band; Downward Fogging of Solid Color; Horizontal Lines

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Confidential
4.2.17 Black band
4.2.18 Downward fogging of solid color
4.2.19 Horizontal lines
<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.
Step Cause Remedy
1
Dirt on electrodes of the drum unit
and those of the machine
Clean the electrodes of the drum unit and
those of the machine. (Refer to Fig. 1-6 or
Fig. 1-7.)
2
Dirt on electrodes of the toner
cartridge and those of the machine
Clean the electrodes of the toner cartridge
and those of the machine. (Refer to Fig. 1-6
or Fig. 1-7.)
3
Scratch or dirt on the heat unit or,
dirt on the pressure roller
Replace the fuser unit.
4 Main PCB failure Replace the main PCB ASSY.
<User Check>
- Replace the toner cartridge with a new one.
- Replace the drum unit with a new one.
Step Cause Remedy
1
High voltage power supply PCB
failure
Replace the high voltage power supply PCB
ASSY.
2 Main PCB failure Replace the main PCB ASSY.
<User Check>
- Replace the toner cartridge with a new one.
- Replace the drum unit with a new one.
Step Cause Remedy
1 Fuser unit failure Replace the fuser unit.
2 Laser unit failure Replace the laser unit.