Kyocera KM-4230 Service Manual page 450

(2) No image appears
(entirely black).
Causes
1. No main charging.
A. Broken main charger wire.
B. Leaking main charger housing.
C. The connector terminals of the
high-voltage transformer PCB
make poor contact.
D. Defective main PCB.
E. Defective engine PCB.
F. Defective high-voltage
transformer PCB.
2. Exposure lamp fails to light.
A. The connector terminals of the
exposure lamp make poor
contact.
B. Defective inverter PCB.
C. Defective scanner control PCB.
Causes
1. No main charging.
2. Exposure lamp fails to light.
Check procedures/corrective measures
Replace the wire.
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 CN1-86 on the main PCB goes low
when maintenance item U100 is run. If not,
replace the main PCB.
Check if CN5-B13 on the engine PCB goes
low when CN1-86 on the main PCB is held
low while maintenance item U100 is run. If
not, replace the engine PCB.
Check if main charging takes place when
CN1-1 on the high-voltage transformer PCB
goes low while maintenance item U100 is
run. If not, replace the high-voltage
transformer PCB.
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 CN1-
5 and 1-6 on the inverter PCB go low while
maintenance item U061 is run. If not, replace
the inverter PCB.
Check if CN 5-14 on the main PCB goes low
when maintenance item U061 is run. If not,
replace the main PCB.
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