Kyocera Mita KM-2560 Service Manual page 165

(1) No image appears (entirely white).
Copy example
No trans-
fer charg-
ing.
No LSU
laser is
output.
No devel-
oping bias
output.
(2) No image appears (entirely black).
Copy example
No main
charging.
Exposure
lamp fails
to light.
Causes
The connector terminals Reinsert the connector. Also check for continuity within the
of the high voltage PWB connector cable. If none, remedy or replace the cable.
make poor contact.
Defective engine PWB. Check if YC12-11 on the engine PWB goes low when main-
tenance item U101 is run. If not, replace the engine PWB.
Defective high voltage Check if transfer charging takes place when CN1-2 on the
PWB. high voltage PWB goes low while maintenance item U101 is
run. If not, replace the high voltage PWB.
Defective laser scanner Replace the laser scanner unit (see page 1-5-30).
unit.
Defective main PWB. Check if YC21-3 on the main PWB goes low when mainte-
nance item U100 is run. If not, replace the main PWB.
The connector terminals Reinsert the connector. Also check for continuity within the
of the high voltage PWB connector cable. If none, remedy or replace the cable.
make poor contact.
Defective engine PWB. Check if YC12-2 on the engine PWB goes low when mainte-
nance item U101 is run. If not, replace the engine PWB.
Defective high voltage Check if developing bias is output when CN1-11 on the high
PWB. voltage PWB goes low while maintenance item U101 is run.
If not, replace the high voltage PWB.
Causes
Broken main charger Replace the main charger unit (see page 1-5-37).
wire.
Leaking main charger Clean the main charger wire and grid.
housing.
The connector terminals Reinsert the connector. Also check for continuity within the
of the high voltage PWB connector cable. If none, remedy or replace the cable.
make poor contact.
Defective engine PWB. Check if YC12-5 on the engine PWB goes low when mainte-
nance item U100 is run. If not, replace the engine PWB.
Defective high voltage Check if main charging takes place when CN1-8 on the high
PWB. voltage PWB goes low while maintenance item U100 is run.
If not, replace the high voltage PWB.
Poor contact in the expo- Reinsert the connector. Also check for continuity within the
sure lamp connector ter- connector cable. If none, remedy or replace the cable.
minals.
Defective scanner Check if the exposure lamp lights when YC1-1 and YC1-6 on
inverter PWB. the scanner inverter PWB goes low while maintenance item
U061 is run. If not, replace the scanner inverter PWB.
Defective engine PWB. Check if YC16-1 and YC16-6 on the engine PWB goes low
when maintenance item U061 is run. If not, replace the
engine PWB.
Check procedures/corrective measures
Check procedures/corrective measures
2H0/2HZ
1-4-33