Kyocera 300ci Service Manual page 281

(3) Dirty on the back side.
Copy example
Faulty transfer belt cleaning.
Dirty paper conveying path.
Dirty fuser belt or press roller (inner
fuser unit).
(4) Image is too light.
Copy example
Defective
develop-
ing bias
output.
Dirty drum.
Defective
transfer
bias out-
put.
Defective color calibration.
Insufficient toner.
Defective agitation of toner container.
Paper damp.
Causes
Causes
Defective developing
unit.
Defective main high volt-
age PWB.
Defective high voltage
control PWB.
Defective engine PWB.
Defective transfer high
voltage PWB 1.
Defective transfer belt
unit.
Defective engine PWB.
Check procedures/corrective measures
Replace the transfer belt unit (see page 1-5-37).
Clean the paper conveying path.
Replace the fuser unit (see page 1-5-41).
Check procedures/corrective measures
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 1-3-51 and
page 1-5-34).
Replace the main high voltage PWB.
Replace the high voltage control PWB.
Replace the engine PWB.
Perform the drum refresh operation.
Replace the transfer high voltage PWB 1.
Replace the transfer belt unit (see page 1-5-37).
Replace the engine PWB.
Perform gray adjustment.
If the display shows the message requesting toner replenish-
ment, replace the container.
Shake the toner container up and down approximately ten
times.
Check the paper storage conditions, replace the paper.
2JZ/2JX/2JV/2H7-1
1-4-63