3-70
Confidential
■ Vertical streaks
Fig. 3-10
<User Check>
- This problem may occur with noise which is caused by
dirt on the corona wire in the drum unit. In this case,
clean the corona wire.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
Memo:
You can check this image defect with the function code 71.
(Refer to “1.4.21 Color test pattern (Function code 71)” in Chapter 7)
Step Cause Check
Result
Remedy
1 Dirt in the paper
feed system
Is the paper tray or feed
system on the drum unit
dirty with toner?
Yes Wipe dirt off.
2 Exposure drum
dirty
Is there vertical dirt with
toner on the surface of
the exposure drum?
Yes Clean the drum unit.
3 Bend of tray ground
spring
Is the tray ground spring
bent?
(Refer to Fig. 3-10)
Yes Replace the paper tray.
4 Scratch on the heat
roller
Is there a scratch on the
surface of the heat roller?
Yes Replace the fuser unit.
5 LED ASSY failure
Is the problem solved
after replacing the
LED
ASSY
?
Yes Replace the LED ASSY.
Note:
If the machine prints the same pattern, especially including vertical streaks, continuously,
black vertical streaks may appear on the paper since the electrostatic performance of the
exposure drum is decreased temporally.
Paper tray
Tray ground spring
<Bottom of paper tray>
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