Image Is Too Light; The Background Is Colored; White Streaks Are Printed Vertically - Kyocera FS-C8520MFP Service Manual

(3) Image is too light.

Print example
Defective
transfer
charger out-
put.
Insufficient toner.
Deteriorated toner.

(4) The background is colored.

Print example
Defective
main
charger out-
put.
Deteriorated toner.

(5) White streaks are printed vertically.

Print example
Foreign matter in the devel-
oper unit.
Dirty shading plate.
Adhesion of soiling to transfer
belt.
Adhesion of soiling to transfer
roller.
Dirty LSU dust shield glass.
Causes
Defective connector cable
or poor contact in the con-
nector.
Defective high voltage
PWB.
Defective high voltage PWB
sub.
Defective engine PWB.
Causes
Defective connector cable
or poor contact in the con-
nector.
Defective high voltage
PWB.
Defective engine PWB.
Causes
Check if the magnetic brush is formed uniformly. Replace
the developer unit if any foreign matter (see page 1-5-14).
Clean the shading plate.
Clean the transfer belt. Replace the intermadiate transfer
unit if it is extremely dirty (see page 1-5-17).
Clean the transfer roller. Replace the transfer roller unit if it
is extremely dirty (see page 1-5-17).
Perform the LSU dust shield glass cleaning.
Check procedures/corrective measures
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
High voltage PWB and engine PWB (YC15)
High voltage PWB sub and engine PWB
(YC13)
Replace the high voltage PWB
(see page 1-5-36).
Replace the high voltage PWB sub
(see page 1-5-36).
Replace the engine PWB (see page 1-5-32).
If the display shows the message requesting
toner replenishment, replace the container.
Perform the drum refresh operation.
Check procedures/corrective measures
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
High voltage PWB and engine PWB (YC15)
Replace the high voltage PWB.
Replace the engine PWB (see page 1-5-32).
Perform the drum refresh operation.
Check procedures/corrective measures
1-4-39
2MY/2MZ