2L6/2N6/2N5/2N4
1-4-268
(9) Uneven density horizontally.
(10) Black or color dots appear on the image.
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 if the emission of laser is
even.
Replace the LSU. (see page 1-5-43)
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, clean it
using a brush.
2. Replace the developer unit.
(Perform U140) (see page 1-5-57)
Print example Cause of trouble
1. Dirty charging roller
2. Flawed or dirty drum unit
3. Damaged or paper dust bitten cleaning blade
Defective part Check description Corrective Action
1
Drum unit Check the print image on paper
has a problem at an interval
equivalent to the circumference
of the drum(94mm).
If the drum has scratches, replace the drum
unit. (see page 1-5-57)
2
Charging roller Check the print image on paper
has a problem at an interval
equivalent to the circumference
of the charging roller(38mm).
A problem is observed at a constant interval of
the charging roller (38 mm), replace the
charging roller.(U930)
(see page 1-3-230)
To Next Page
Loading...
