2N8/2N7
1-4-215
(9) Uneven density horizontally.
Print example Cause of trouble
1. Defective laser scanner unit.
2. Improper charging roller rotation
3. 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. (see page 1-5-49)
2
Charging roller Check if the charing roller is
improperly mounted.
1. Fix the charging roller properly.
2. Replace the charging roller.
(Perform U930) (see page 1-5-59)
3
Developer unit Check If the connecting termi-
nals of the developing bias is
contaminated by toner.
1. If the connecting terminals is dirty.
2. Replace the developer unit.
(Perform U140) (see page 1-5-56)
4
Transfer belt unit. Check if the transfer belt is con-
taminated on its surface or dam-
aged.
1. Replace the transfer belt unit.
Check if the cleaning bias con-
nector or 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 pres-
sure release mechanism is deformed,
abraded, or damaged, replace the fuser unit.
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