7-10
Troubleshooting ＞ Image formation problems
[CONFIDENTIAL]
(1-7)Black or white streaks appear horizontally
Print example Cause of trouble
1 Dirty developer unit or terminals
2 Flawed or dirty drum unit Improper grounding
3 Dirty transfer roller terminals
Defective part Check description Corrective Action
1
Developer unit
1. Check the print image on paper
has a problem at an interval
equivalent to the circumference
of the developing roller.
2. Check that the developing roller
is dirty at its ends or at the
developing bias tab.
1. If the ends of the developing roller and the
connecting terminals for developer bias are
dirty, clean.
2. Replace the developer unit.
2
Drum unit 1. Check the print image on paper
has a problem at an interval
equivalent to the circumference
of the drum .
Execute drum refreshing.
(System Menu >Adjustment / Maintenance)
2. Check if the drum has
scratches.
Replace the drum unit.
3. Check the grounding tab of the
drum or the drum drive shaft.
1. Check how the drive unit is mounted, and
correct, if necessary.
2. Replace the drum unit.
3
Transfer roller unit
1. Check the print image that
implies dirt, deformation, or
scratches on the transfer roller,
which will be appearing at an
interval equal to its circumfer-
ence .
If the print image has a problem, clean the transfer
roller by a soft cloth.
2. Check contamination and defor-
mation on the terminals .
1. If the connecting terminals are deformed,
correct for a proper conduction
2. Replace transfer roller unit.
4
Fuser unit Check the print image on paper has
a problem at an interval equivalent
to the circumference of the fuser
roller.
If the fuser roller is dirty, cleaning the fuser roller or
replace the fuser unit.
5
High voltage PWB The bias voltage output supplied by
the high voltage PWB is not even.
Replace the high voltage PWB.
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