No Image Appears (Entirely White); No Image Appears (Entirely Black) - Kyocera FS-C8600DN 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.
The laser is
activated
simultane-
ously for all
colors.
Causes
Defective connector cable
or poor contact in the con-
nector.
Defective high voltage PWB
2.
Defective engine PWB.
Defective connector cable
or poor contact in the con-
nector.
Defective high voltage PWB
1.
Defective engine PWB.
Defective laser scanner
unit.
Defective engine 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
1.
Defective engine PWB.
Defective laser scanner
unit.
1-4-86
Check procedures/corrective measures
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
High voltage PWB 2 (YC1) and engine PWB
(YC8)
Replace the high voltage PWB 2
(see page 1-5-55).
Replace the engine PWB (see page 1-5-49).
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
High voltage PWB 1 (YC1, 2) and engine
PWB (YC16)
High voltage PWB 1 (YC3, 4) and engine
PWB (YC17)
Replace the high voltage PWB 1
(see page 1-5-54).
Replace the engine PWB (see page 1-5-49).
Replace the laser scanner unit
(see page 1-5-17).
Replace the engine PWB (see page 1-5-49).
Check procedures/corrective measures
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
High voltage PWB 1 (YC1, 2) and engine
PWB (YC16)
High voltage PWB 1 (YC3, 4) and engine
PWB (YC17)
(see page 1-5-31).
Replace the high voltage PWB 1
(see page 1-5-54).
Replace the engine PWB (see page 1-5-49).
Replace the laser scanner unit
(see page 1-5-17).
2MN/2N1