Poor Fixing - Brother FAX-2840 Service Manual

Poor fixing

<User Check>
- Check the machine's environment. High temperature and high
- Clean the corona wire of drum unit.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
- Return the green envelope levers to the home position. (Refer to
- Remove the elastic band from the drum unit.
Step
1 Fuser unit failure
2 Laser unit failure
Low voltage power supply PCB
3
failure
4 Main PCB failure
Completely blank
<User Check>
- Check the machine's environment. High temperature and high
- Clean the corona wire of drum unit.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
- Remove the elastic band from the drum unit.
Step
Dirt on electrodes of the drum unit
1 and those of the machine
Connection failure of the scanner
2
harness of the laser unit
3 Laser unit attachment failure
4 Laser unit failure
High voltage power supply PCB
5
failure
6 Main PCB failure
humidity or low temperature and low humidity conditions can cause
this problem.
Fig. 2-7.)
Cause
humidity or low temperature and low humidity conditions can cause
this problem.
Cause
2-68
Remedy
Replace the fuser unit.
Replace the laser unit.
Replace the low 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
and Fig. 2-11.)
Reconnect the scanner harness of the laser
unit.
Reattach the laser unit.
Replace the laser unit.
Replace the high voltage power supply PCB
ASSY.
Replace the main PCB ASSY.
Fig. 2-10
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