Service manual

2-87
Confidential
■ White vertical streaks
■ White horizontal streaks
■ Faint print
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.
Step Cause Remedy
1 Laser unit failure Replace the laser unit.
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.
Step Cause Remedy
1
Dirt on the electrodes of the drum
unit and the machine body
Clean the electrodes of the drum unit and
machine body. (Refer to Fig. 2-11, Fig. 2-
12.)
User Check
• Check that the machine is installed on a level surface.
• Replace the toner cartridge with a new one.
Step Cause Remedy
1 Main PCB failure Replace the main PCB ASSY.
2 Laser unit failure Replace the laser unit.
3 Fuser unit failure Replace the fuser unit.