2KA
1-4-56
(3) Dirty on the back side.
(4) Image is too light.
Copy example Causes Check procedures/corrective measures
Faulty transfer belt cleaning. Replace the transfer belt unit (see page 1-5-28).
Dirty paper conveying path. Clean the paper conveying path.
Dirty fuser belt or press roller (inner
fuser unit).
Replace the fuser unit (see page 1-5-31).
Copy example Causes Check procedures/corrective measures
Defective
develop-
ing bias
output.
Defective developing
unit.
Run maintenance mode U089 to output four-color bar PG,
check the output status of the four colors, and replace the
developing unit for any faulty color (see page 1-3-35 and
page 1-5-25).
Defective main high volt-
age PWB.
Replace the main high voltage PWB.
Defective high voltage
control PWB.
Replace the high voltage control PWB.
Defective engine PWB. Replace the engine PWB.
Dirty drum. Perform the drum refresh operation (see page 1-3-117).
Defective
transfer
bias out-
put.
Defective transfer high
voltage PWB 1.
Replace the transfer high voltage PWB 1.
Defective transfer belt
unit.
Replace the transfer belt unit (see page 1-5-28).
Defective engine PWB. Replace the engine PWB.
Defective color calibration. Perform color calibration (see page 1-3-113).
Insufficient toner. If the display shows the message requesting toner replenish-
ment, replace the container.
Defective agitation of toner container. Shake the toner container up and down approximately ten
times.
Paper damp. Check the paper storage conditions, replace the paper.