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Confidential
4.2.11 Black horizontal stripes
Image defects which appear periodically may be caused by failure of rollers. Refer to the
table below and determine the responsible roller based on the pitch at which defects appear
on the image.
4.2.12 White vertical streaks
<User Check>
- Clean the inside of the machine and the corona wire of the drum
unit.
- This problem may disappear after printing multiple 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
Attachment failure of the FG
harness or FG plate (not grounded
correctly)
Retighten the screws to secure the FG
harness or FG plate.
4 Scratch or dirt on the heat unit Replace the fuser unit.
5
High voltage power supply PCB
failure
Replace the high voltage power supply PCB
ASSY.
6 Main PCB failure Replace the main PCB ASSY.
Part name Diameter
Pitch at which defects
appear in the image
Developer roller ø 13 mm 26.0 mm
Transfer roller ø 13 mm 38.0 mm
Exposure drum ø 24 mm 75.4 mm
Heat roller ø 25 mm 78.5 mm
Pressure roller ø 25 mm 78.5 mm
<User Check>
- Check that there is no dust in the gap between the toner cartridge
and drum unit.
- Replace the toner cartridge with a new one.
- Check the usage environment of the machine. Using the machine in
hot-humid or cold-dry conditions can cause this problem.
- Check that the paper is not damp.
- Leave the machine for a while before printing again.
- Replace the drum unit with a new one.
Step Cause Remedy
1 Laser unit failure Replace the laser unit.
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