Kyocera KM-4230 Service Manual page 527

2A3/4
Problem
(32)
Transfer
charging is
not performed
(C511).
(33)
Separation
charging is
not performed
(C511).
(34)
No develop-
ing bias is
output.
3-6-82
Causes
Broken transfer
charger wire.
Poor contact in the
high-voltage
transformer PCB
connector
terminals.
Defective main
PCB.
Defective engine
PCB.
Defective high-
voltage trans-
former PCB.
Broken separation
charger wire.
Poor contact in the
high-voltage
transformer PCB
connector
terminals.
Defective high-
voltage trans-
former PCB.
Defective engine
PCB.
Poor contact in the
developing bias
wire.
Poor contact in the
high-voltage
transformer PCB
connector terminals.
Defective high-
voltage trans-
former PCB.
Check procedures/corrective measures
See page 3-6-4.
Replace the separation charger wire (see
page 3-3-56).
Reinsert the connector. Also check for
continuity within the connector cable. If
none, remedy or replace the cable.
Run maintenance item U101. If separation
charging does not take place while CN1-9
on the high-voltage transformer PCB goes
low, replace the high-voltage transformer
PCB.
Run maintenance item U101 and check if
CN5-B5 on the engine PCB goes low. If not,
replace the engine PCB.
Check the developing bias wire. If there is
any problem, replace it.
Reinsert the connector. Also check for
continuity within the connector cable. If
none, remedy or replace the cable.
Check if the developing bias is output when
CN1-4 on the high-voltage transformer PCB
goes low while maintenance item U030 is
run. If not, replace the high-voltage
transformer PCB.