2L6/2N6/2N5/2N4
1-4-264
(5) White streaks are printed vertically.
Print example Cause of trouble
1. Dirty LSU slit glass.
2. Foreign objects inside the developer unit.
3. Internal contamination
4. Dirty drum unit inside.
Defective part Check description Corrective Action
1
LSU Check if the LSU slit glass is
dirty.
If the LSU slit glass is dirty,
perform laser scanner cleaning.
2
Developer unit Executing U089 to generate
four-color PGs. (see page 1-3-
70)
Replace the developer unit in fault.
(see page 1-5-57)
3
Light path between
the LSU and the
drum
Check if there are dusts, dirts, or
toner obstructing the light paths.
If a foreign object exists on the frame or the
sealings between the developer unit and the
drum unit, remove.
4
Drum unit Check if the charging roller is
dirty.
If the charging roller is dirty,clean. Or replace it.
(Perform U930) (see page 1-5-57)
Check if the discharging lamp is
dirty.
If the discharging lamp is dirty,clean.
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