No Image Appears (Entirely Black) - Kyocera TASKalfa 620 Service Manual

2KN/2KP

(2) No image appears (entirely black).

Copy example
No main
charging.
Exposure
lamp fails to
light.
CIS fails to
light.
The laser of
laser scan-
ner unit has
lit up all.
1-4-52
Causes
Poor insertion main
charger unit.
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 scanner PWB.
The connector terminals
of the CIS make poor
contact.
Defective DP inverter
PWB.
Defective DP main PWB. Check if YC12-2 on the DP main PWB goes low when
Defective laser scanner
unit.
Defective main PWB.
Check procedures/corrective measures
Reinstall the main charger unit.
Replace the wire (see page 1-5-27).
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 mainte-
nance 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 main-
tenance 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.
maintenance item U061 is run. If not, replace the DP main
PWB.
Replace the laser scanner unit (see page 1-5-36).
Replace the main PWB.