No Image Appears (Entirely Black) - Kyocera ECOSYS P4035dn Service Manual

(1) No image appears (entirely white).
Print example
Defective
developer
bias output.
No LSU
laser is out-
put.

(2) No image appears (entirely black).

Print example
No main
charging.
Causes
Defective connector cable
or poor contact in the con-
nector.
Defective high voltage
PWB.
Defective engine PWB.
Defective connector cable
or poor contact in the con-
nector.
The shutter of a laser scan-
ner unit does not open.
Defective laser scanner
unit.
Defective engine PWB.
Defective main PWB.
Causes
Defective connector cable
or poor contact in the con-
nector.
Defective poor connection
of the charger roller
Defective charger roller unit. Replace the charger roller unit
Defective high voltage
PWB.
Defective engine PWB.
1-4-23
Check procedures/corrective measures
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Developer unit and high voltage PWB
High voltage PWB and engine PWB (YC19)
Replace the high voltage PWB
(see page 1-5-54).
Replace the engine PWB (see page 1-5-40).
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Laser scanner unit and engine PWB (YC16)
The operating state of a link part with an top
cover is checked.
Replace the laser scanner unit
(see page 1-5-23).
Replace the engine PWB (see page 1-5-40).
Replace the main PWB (see page 1-5-38).
Check procedures/corrective measures
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Chager roller unit and high voltage PWB
High voltage PWB and engine PWB (YC19)
Connection is checked by the electrical con-
nection inspection of the charger roller.
(see page 1-5-20).
Replace the high voltage PWB
(see page 1-5-54).
Replace the engine PWB (see page 1-5-40).
2P7/2R0/3PN