Faint Print - Brother FAX-2840 Service Manual

White vertical streaks
<User Check>
- Check that there is no dust in the clearance between the toner
- Replace the toner cartridge with a new one.
- Check the machine's environment. High temperature and high
- Damp (wet) paper may be used. Change the paper with undamped
- Replace the drum unit with a new one.
- Leave the machine for a while with the power switch ON.
Step
1 Laser unit failure
White horizontal streaks
<User Check>
- This problem may disappear after printing several sheets of paper.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
Step
Dirt on electrodes of the drum unit
1 and those of the machine

Faint print

Step
1 Main PCB failure
2 Laser unit failure
3 Fuser unit failure
cartridge and the drum unit.
humidity or low temperature and low humidity conditions can cause
this problem.
one.
Cause
When the machine has not been used for a long time, try printing
several sheets of paper.
Cause
<User Check>
- Check that the machine is installed on a level surface.
- Replace the toner cartridge with a new one.
Cause
2-72
Remedy
Replace the laser unit.
Remedy
Clean the electrodes of the drum unit and
those of the machine. (Refer to
and Fig. 2-11.)
Remedy
Replace the main PCB ASSY.
Replace the laser unit.
Replace the fuser unit.
Fig. 2-10
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