Faint Print - Brother DCP-7055 Service Manual

■ White vertical streaks
Step
1 Laser unit failure
■ White horizontal streaks
Step
Dirt on the electrodes of the drum
1 unit and the machine body

■ Faint print

Step
1 Main PCB failure
2 Laser unit failure
3 Fuser unit failure
User Check
• Check if there is no dust in the gap between the toner cartridge and
drum unit.
• Replace the toner cartridge with a new one.
• Check the machine's environment. High temperature and high
humidity or low temperature and low humidity conditions can cause
this problem.
• Damp (wet) paper might be used. Try to change to freshly
unpacked paper.
• Replace the drum unit with a new one.
• Leave the machine for a while as the power remains ON.
Cause
User Check
• This problem may disappear If print several sheets of page. Print
several sheets of page if the machine has not been used for a long
time.
• Replace the drum unit with a new one.
• Replace the toner cartridge with a new one.
Cause
User Check
• Check that the machine is installed on a level surface.
• Replace the toner cartridge with a new one.
Cause
2-87
Remedy
Replace the laser unit.
Remedy
Clean the electrodes of the drum unit and
machine body. (Refer to
12.)
Remedy
Replace the main PCB ASSY.
Replace the laser unit.
Replace the fuser unit.
Fig. 2-11, Fig. 2-
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