No Image Appears (Entirely White); No Image Appears (Entirely Black) - Kyocera FS-C8520MFP Service Manual

(1) No image appears (entirely white).

Print example
Defective
transfer
bias output.
Defective
developer
bias output.
No LSU
laser is out-
put.

(2) No image appears (entirely black).

Print example
No main
charging.
Exposure
lamp fails to
light.
Causes
Defective connector cable
or poor contact in the con-
nector.
Defective high voltage
PWB.
Defective high voltage PWB
sub.
Defective engine PWB.
Defective connector cable
or poor contact in the con-
nector.
Defective high voltage
PWB.
Defective engine PWB.
Defective laser scanner
unit.
Defective main PWB.
Causes
Defective connector cable
or poor contact in the con-
nector.
Defective charger roller unit. Replace the charger roller unit
Defective high voltage
PWB.
Defective engine PWB.
Defective connector cable
or poor contact in the con-
nector.
Defective CCD PWB.
Defective main PWB.
1-4-38
Check procedures/corrective measures
Reinsert the connector. Also check for conti-
nuity of the connector cable. If necessary,
replace the cable.
High voltage PWB and engine PWB (YC15)
High voltage PWB sub and engine PWB
(YC13)
Replace the high voltage PWB.
Replace the high voltage PWB sub.
Replace the engine PWB (see page 1-5-32).
Reinsert the connector. Also check for conti-
nuity of the connector cable. If necessary,
replace the cable.
High voltage PWB and engine PWB (YC15)
Replace the high voltage PWB.
Replace the engine PWB (see page 1-5-32).
Replace the laser scanner unit
(see page 1-5-20).
Replace the main PWB (see page 1-5-31).
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)
(see page 1-5-16).
Replace the high voltage PWB.
Replace the engine PWB (see page 1-5-32).
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
LED PWB and main PWB (YC112)
CCD PWB and main PWB (YC113)
Replace the image scanner unit
(see page 1-5-21).
Replace the main PWB (see page 1-5-31).
2MY/2MZ