Kyocera FS-C8500DN Service Manual page 209

(1) No image appears (entirely white).
Copy example
Defective
transfer
bias output.
No LSU
laser is out-
put.
Defective
developing
bias output.
(2) No image appears (entirely black).
Copy example
No main
charging.
The laser is
activated
simulta-
neously for
all colors.
Causes
The connector terminals
of the transfer high volt-
age PWB 1 make poor
contact.
Defective engine PWB.
Defective transfer high
voltage PWB 1.
Defective transfer belt
unit.
Defective laser scanner
unit.
Defective engine PWB.
The connector terminals
of the main high voltage
PWB make poor contact.
The connector terminals
of the high voltage con-
trol PWB make poor con-
tact.
Defective engine PWB.
Defective high voltage
control PWB.
Defective main high volt-
age PWB.
Causes
Defective drum unit.
The connector terminals
of the main high voltage
PWB make poor contact.
Defective engine PWB.
Defective main high volt-
age PWB.
Defective laser scanner
unit.
Check procedures/corrective measures
Reinsert the connector. Also check for continuity within the
connector cable. If none, remedy or replace the cable.
Replace the engine PWB.
Replace the transfer high voltage PWB 1.
Replace the transfer belt unit (see page 1-5-28).
Replace the laser scanner unit (see page 1-5-11).
Replace the engine PWB.
Reinsert the connector. Also check for continuity within the
connector cable. If none, remedy or replace the cable.
Reinsert the connector. Also check for continuity within the
connector cable. If none, remedy or replace the cable.
Replace the engine PWB.
Replace the high voltage control PWB.
Replace the main high voltage PWB.
Check procedures/corrective measures
Replace the drum unit (see page 1-5-26).
Reinsert the connector. Also check for continuity within the
connector cable. If none, remedy or replace the cable.
Replace the engine PWB.
Replace the main high voltage PWB.
Replace the laser scanner unit (see page 1-5-11).
2KA
1-4-55