No Image Appears (Entirely Black) - Kyocera KM-2035 Service Manual

(1) No image appears (entirely white).
Copy example
No trans-
fer charg-
ing.
No LSU
laser is
output.
No devel-
oping bias
is output.

(2) No image appears (entirely black).

Copy example
No main
charging.
Exposure
lamp fails
to light.
Causes
The connector terminals
of the high-voltage PWB
make poor contact.
Defective engine PWB.
Defective high-voltage
PWB.
Defective laser scanner
unit.
Defective main PWB.
The connector terminals
of the high-voltage PWB
make poor contact.
Defective engine PWB.
Defective high-voltage
PWB.
Causes
Broken main charger
wire.
Leaking main charger
housing.
The connector terminals
of the high-voltage PWB
make poor contact.
Defective engine PWB.
Defective high-voltage
PWB.
The connector terminals
of the exposure lamp
make poor contact.
Defective inverter PWB.
Defective engine PWB.
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 and check for correct operation.
Replace the high voltage PWB and check for correct opera-
tion.
Replace the laser scanner unit (see page 1-5-19).
Replace the main PWB and check for correct operation.
Reinsert the connector. Also check for continuity within the
connector cable. If none, remedy or replace the cable.
Replace the engine PWB and check for correct operation.
Replace the high voltage PWB and check for correct opera-
tion.
Check procedures/corrective measures
Replace the main charger unit (see page 1-5-25).
Clean the main charger wire, grid and shield.
Reinsert the connector. Also check for continuity within the
connector cable. If none, remedy or replace the cable.
Check if YC9-5 on the engine PWB goes low when mainte-
nance item U100 is run. If not, replace the engine PWB.
Check if main charging takes place when YC1-12 on the
high-voltage PWB goes low while maintenance item U100 is
run. If not, replace the high-voltage PWB.
Reinsert the connector. Also check for continuity within the
connector cable. If none, remedy or replace the cable.
Check if the exposure lamp lights when YC1-1 and 1-6 on
the inverter PWB go low while maintenance item U061 is run.
If not, replace the inverter PWB.
Check if YC17-1 and YC17-6 on the engine PWB goes low
when maintenance item U061 is run. If not, replace the
engine PWB.
2HA/2HB
1-4-21