Utax CA-3100, Service Manual

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7-12
Troubleshooting
＞
Image formation problems
[CONFIDENTIAL]
(1-9)Uneven density horizontally
Print example Cause of trouble
1. Defective laser scanner unit.
2. Improper charging roller rotation.
1 Improper contact on the developer unit terminals.
Defective part Check description Corrective Action
1
LSU Check the emission of laser is even. Replace the LSU.
2
Charging roller Check if the charing roller is improp-
erly mounted. 1. Fix the charging roller properly.
2. Replace the charging roller.
3
Developer unit Check If the connecting terminals of
the developer bias is contaminated
by toner. 1. If the connecting terminals is dirty.
2. Replace the developer unit.
4
Transfer roller unit.
1. Check if the transfer roller is
contaminated on its surface or
damaged.
1. Replace the transfer roller unit.
2. Check if the connecting termi-
nals of high voltage are dirty or
deformed.
1. If the connector or terminals are dirty, clean.If
the connecting terminals are deformed, correct
for a proper conduction.
2. Replace the high voltage PWB.
5
Fuser unit Check that the roller, its driving unit,
or the fusing pressure release
mechanism is deformed, abraded,
or damaged.
If the roller, its driving unit, or the fusing pressure
release mechanism is deformed, abraded, or dam-
aged, replace the fuser unit.