The Exposure Lamp Does Not Turn Off; No Main Charging; No Developing Bias Is Output - Kyocera KM-6030 Service Manual

2FB/2FC-4
Problem
(46)
The exposure lamp
does not turn on.
(47)
The exposure lamp
does not turn off.
(48)
The fuser heater
lamp M, S or L does
not turn on.
(49)
The fuser heater
lamp M, S or L does
not turn off.
(50)

No main charging.

(51)
No developing bias is
output.
1-5-66
Causes
1. Poor contact in the expo-
sure lamp connector ter-
minals.
2. Defective scanner PWB.
3. Defective inverter PWB.
4. Defective exposure lamp. Replace the exposure lamp even if checking or correcting other
1. Defective scanner PWB.
2. Defective inverter PWB.
3. Defective exposure lamp. Replace the exposure lamp even if checking or correcting other
1. Broken wire in fuser
heater lamp M, S or L.
2. Fuser thermostat trig-
gered.
1. Broken fuser thermistor
M or S wire.
2. Dirty sensor part of the
fuser thermistor M or S.
3. Defective PWB.
1. Poor insertion main
charger unit.
2. Broken main charger
wire.
3. Leaking main charger
housing.
4. Faulty connection of con-
nector of high voltage
PWB.
5. Defective engine PWB.
6. Defective high voltage
PWB.
1. Defective engine PWB.
2. Defective high voltage
PWB.
3. Poor installation of high
voltage PWB.
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 YC4-3 on the scanner
PWB goes low. If not, replace the scanner PWB.
If the exposure lamp turns on when CN2-1 and CN2-4 on the
inverter PWB go low, replace the inverter PWB.
measures.
If YC4-3 on the scanner PWB is always low, replace the scanner
PWB.
If the exposure lamp does not turn off when CN2-1 and CN2-4 on
the inverter PWB are high, replace the inverter PWB.
measures.
Check for continuity across each heater lamp. If none, replace the
fuser heater lamp M, S or L.
Check for continuity across thermostat. If none, remove the cause
and replace the fuser thermostat.
Measure the resistance. If it is
or S.
Check visually and clean the fuser thermistor M or S sensor parts.
If fuser heater M/S/L does not turns on when the terminals on the
following PWB are high, replace the PWB.
AC power source PWB:
YC1-3, YC1-4, YC1-5, YC2-1, YC2-2 or YC6-1
DC power source PWB:
YC6-7, YC6-8, YC6-9, YC7-3, YC7-4 or YC7-5
See 1-5-49.
See 1-5-48.
∞Ω
, replace the fuser thermistor M