Kyocera TASKalfa 250ci Service Manual page 272

2JZ/2JX/2JV/2H7-1
Problem
(15)
The exposure lamp
does not turn on or
off.
(16)
Main charging is not
performed.
(17)
Defective developing
bias output.
(18)
Defective transfer
bias output.
(19)
The original size is
not detected cor-
rectly.
1-4-72
Causes
1. Poor contact in the con-
nector terminals.
2. Defective inverter PWB.
3. Defective ISC PWB.
4. Defective ISM PWB.
1. Defective drum unit.
2. The connector terminals
of the main high voltage
PWB make poor contact.
3. Defective engine PWB.
4. Defective main high volt-
age PWB.
The connector terminals of
the main high voltage PWB
make poor contact.
The connector terminals of
the high voltage control
PWB make poor contact.
Defective engine PWB.
Defective high voltage con-
trol PWB.
Defective main high volt-
age PWB.
The connector terminals of
the transfer high voltage
PWB 1 make poor contact.
Defective engine PWB.
Defective transfer high volt-
age PWB 1.
Defective transfer belt unit.
1. Original is not placed cor-
rectly.
2. Poor contact in the origi-
nal detection switch or
original size sensor con-
nector terminals.
3. Defective original detec-
tion switch.
4. Defective original size
sensor.
Check procedures/corrective measures
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
Run maintenance item U061 and check if the exposure lamp turns
on with the inverter PWB go low. If not, replace the inverter PWB.
Run maintenance item U061 and check if YC3-23 on the ISC
PWB goes high. If not, replace the ISC PWB.
Run maintenance item U061 and check if YC5-4 on the ISM PWB
goes low. If not, replace the ISM PWB.
Replace the drum unit (see page 1-5-35).
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
Replace the engine PWB.
Replace the main high voltage PWB.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
Replace the engine PWB.
Replace the high voltage control PWB.
Replace the main high voltage PWB.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
Replace the engine PWB.
Replace the transfer high voltage PWB 1.
Replace the transfer belt unit (see page 1-5-37).
Check the original and correct if necessary.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
If the level of YC4-2 on the ISM PWB does not go low when the
original detection switch is turned on and off, replace the original
detection switch.
Check if sensor operates correctly. If not, replace it.