No Image Appears(Entirely Black) - Kyocera KM-6030 Service Manual

(2) No image appears
(entirely black).
Causes
1. No main charging.
A. Poor insertion main charger unit.
B. Broken main charger wire.
C. Leaking main charger housing.
D. The connector terminals of the high volt-
age PWB make poor contact.
E. Defective engine PWB.
F. Defective high voltage PWB.
2. Exposure lamp fails to light.
A. The connector terminals of the exposure
lamp make poor contact.
B. Defective inverter PWB.
C. Defective scanner PWB.
3. CIS fails to light.
A. The connector terminals of the CIS make
poor contact.
B. Defective DP inverter PWB.
C. Defective DP main PWB.
4. The laser of laser scanner unit has lit up
all.
A. Defective laser scanner unit.
B. Defective main PWB.
Causes
1. No main charging.
2. Exposure lamp fails to light.
3. CIS fails to light.
4. The laser of laser scanner unit has lit up all.
Check procedures/corrective measures
Reinstall the main charger unit.
Replace the wire (see page 1-6-33).
Clean the main charger wire and grid.
Reinsert the connector. Also check for continuity within the connector
cable. If none, remedy or replace the cable.
Check if YC7-9 on the engine PWB goes low when maintenance item
U100 is run. If not, replace the engine PWB.
Check if main charging takes place when YC1-3 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 CN2-1 and CN2-4 on the inverter
PWB go low while maintenance item U061 is run. If not, replace the
inverter PWB.
Check if YC4-3 on the scanner PWB goes low when maintenance item
U061 is run. If not, replace the scanner PWB.
Reinsert the connector. Also check for continuity within the connector
cable. If none, remedy or replace the cable.
Check if the CIS lights when the connectors on the DP inverter PWB go
low while maintenance item U061 is run. If not, replace the DP inverter
PWB.
Check if YC12-2 on the DP main PWB goes low when maintenance item
U061 is run. If not, replace the DP main PWB.
Replace the laser scanner unit (see page 1-6-42).
Replace the main PWB.
2FB/2FC
1-5-49