Image Is Too Light; The Background Is Colored - Kyocera FS-C8600DN Service Manual

(3) Image is too light.

Print example
Defective
developer
bias output.
Dirty drum unit.
Defective
transfer
bias output.
Defective color calibration.
Insufficient toner.
Insufficient agitation of toner container.
Paper damp.

(4) The background is colored.

Print example
Defective
developer
bias output.
Defective color calibration.
Causes
Defective developer unit.
Defective high voltage PWB
1.
Defective engine PWB.
Defective high voltage PWB
2.
Defective transfer belt unit.
Defective engine PWB.
Causes
Defective developer unit.
Defective high voltage PWB
1.
Defective engine PWB.
1-4-87
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 developer unit for
any faulty color (see page 1-5-29).
Replace the high voltage PWB 1
(see page 1-5-54).
Replace the engine PWB (see page 1-5-49).
Perform the drum refresh.
Replace the high voltage PWB 2
(see page 1-5-55).
Replace the transfer belt unit (see page 1-5-
34).
Replace the engine PWB (see page 1-5-49).
Perform the tone curve adjustment (Refer to
operation guide).
If the display shows the message requesting
toner replenishment, replace the container.
Shake the toner container vertically approxi-
mately 10 times.
Check the paper storage conditions, replace
the paper.
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 developer unit for
any faulty color (see page 1-5-29).
Replace the high voltage PWB 1
(see page 1-5-54).
Replace the engine PWB (see page 1-5-49).
Perform the calibration (Refer to operation
guide).
Perform the tone curve adjustment (Refer to
operation guide).
2MN/2N1