2KN/2KP
1-4-68
(46)
The exposure lamp
does not turn on.
1. Poor contact in the expo-
sure lamp connector ter-
minals.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
2. Defective scanner PWB.
Run maintenance item U061 and check if YC4-3 on the scanner
PWB goes low. If not, replace the scanner PWB.
3. Defective inverter PWB.
If the exposure lamp turns on when CN2-1 and CN2-4 on the
inverter PWB go low, replace the inverter PWB.
4. Defective exposure lamp. Replace the exposure lamp even if checking or correcting other
measures.
(47)
The exposure lamp
does not turn off.
1. Defective scanner PWB.
If YC4-3 on the scanner PWB is always low, replace the scanner
PWB.
2. Defective inverter 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.
3. Defective exposure lamp. Replace the exposure lamp even if checking or correcting other
measures.
(48)
The fuser heater
lamp M, S or L does
not turn on.
1. Broken wire in fuser
heater lamp M, S or L.
Check for continuity across each heater lamp. If none, replace the
fuser heater lamp M, S or L.
2. Fuser thermostat 1 or 2
triggered.
Check for continuity across thermostat. If none, remove the cause
and replace the fuser thermostat.
(49)
The fuser heater
lamp M, S or L does
not turn off.
1. Broken fuser thermistor
M or S wire.
Measure the resistance. If it is
∞Ω
, replace the fuser thermistor M
or S.
2. Dirty sensor part of the
fuser thermistor M or S.
Check visually and clean the fuser thermistor M or S sensor parts.
3. Defective PWB.
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
(50)
No main charging.
1. Poor insertion main
charger unit.
See page 1-4-52.
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.
(51)
No developing bias is
output.
1. Defective engine PWB.
See page 1-4-51.
2. Defective high voltage
PWB.
3. Poor installation of high
voltage PWB.
Problem
Causes
Check procedures/corrective measures
Summary of Contents for TASKalfa 620
Page 1: ...SERVICE MANUAL Published in August 2009 842KP112 2KPSM062 Rev 2 TASKalfa 620 820 ...
Page 4: ...This page is intentionally left blank ...
Page 10: ...This page is intentionally left blank ...
Page 144: ...2KN 2KP 1 3 106 This page is intentionally left blank ...
Page 308: ...2KN 2KP 1 5 88 This page is intentionally left blank ...
Page 412: ...2KN 2KP 2 3 60 This page is intentionally left blank ...
Page 435: ...1 1 INSTALLATION GUIDE INSTALLATION GUIDE FOR SIDE FEEDER ...
Page 442: ...INSTALLATION GUIDE FOR LARGE SIZE SIDE FEEDER ...
Page 460: ...INSTALLATION GUIDE FOR DOCUMENT FINISHER ...
Page 475: ...INSTALLATION GUIDE FOR CENTERFOLD UNIT ...
Page 490: ...INSTALLATION GUIDE FOR MULTI JOB TRAY ...
Page 501: ...INSTALLATION GUIDE FOR PUNCH UNIT ...
Page 512: ...INSTALLATION GUIDE FOR STOPPER GUIDE ...
Page 515: ...INSTALLATION GUIDE FOR PRINTING SYSTEM ...
Page 518: ...INSTALLATION GUIDE FOR SCAN SYSTEM ...
Page 520: ......
Page 521: ......