Kyocera KM-3050 Service Manual page 164

2GN/2GP/2GR
Problem
(6)
The exposure lamp
does not turn on or
off.
(7)
Main charging is not
performed.
(8)
No developing bias is
output.
(9)
Transfer charging is
not performed.
(10)
The original size is
not detected cor-
rectly.
1-4-52
Causes
1. Poor contact in the con-
nector terminals.
2. Defective scanner PWB.
3. Defective inverter PWB.
4. Defective exposure lamp. Replace the exposure lamp even if checking or correcting other
1. Broken main charger
wire.
2. Leaking main charger
housing.
3. The connector terminals
of the high voltage PWB
make poor contact.
4. Defective engine PWB.
5. Defective high voltage
PWB.
1. The connector terminals
of the high voltage PWB
make poor contact.
2. Defective engine PWB.
3. Defective high voltage
PWB.
1. The connector terminals
of the high voltage PWB
make poor contact.
2. Defective engine PWB.
3. Defective high voltage
PWB.
1. Original is not placed cor-
rectly.
2. Poor contact in the origi-
nal detection switch or
original size detection
sensor connector termi-
nals.
3. Defective original detec-
tion switch.
4. Defective original size
detection 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 YC6-3 on the scanner
PWB goes low. If not, replace the scanner PWB.
If YC6-3 on the scanner PWB is always low, replace the scanner
PWB.
Run maintenance item U061 and check if the exposure lamp turns
on with YC1-3 on the inverter PWB go low. If not, replace the
inverter PWB.
If the exposure lamp does not turn off with YC1-3 on the inverter
PWB high, replace the inverter PWB.
measures.
(See page 1-4-45.)
(See page 1-4-45.)
(See page 1-4-45.)
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 YC4-5 on the scanner PWB does not go low when
the original detection switch is turned on and off, replace the origi-
nal detection switch.
Check if sensor operates correctly. If not, replace it.