COPYRIGHT © 1999 CANON INC. CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
13-145
CHAPTER 13 TROUBLESHOOTING
50
The fixing heater fails to turn on.
Cause
Connector
------------
Thermal switch
(TP2, TP3)
Thermistor
(THM1, THM2,
THM3, THM4)
Upper heater (H1)
Lower heater (H2)
AC harness
Action
Connect the connectors
properly.
Go to step 8.
Replace the thermal
switch.
Replace the thermistor.
Check the heater to see
if it is mounted properly;
if normal, replace the
upper heater.
Check the heater to see
if it is mounted properly;
if normal, replace the
lower heater.
Check the AC harness
inside the fixing
assembly.
Step
1
2
3
4
5
6
Yes/No
NO
YES
NO
YES
NO
NO
YES
Checks
Are the fixing drawer connector
J18 of the transfer drum frame and
the connector J1024 of the DC
driver PCB connected securely?
Slide out the transfer drum frame.
Set the meter range to x1
Ω
, and
connect the meter probes to the
following terminals of the fixing
drawer connector; does the index
of the meter swing?
J18-1 and -3
J18-2 and -4
Is there electrical continuity in the
thermal switch?
Set the meter range to x1
Ω
, and
connect the meter probes to the
following terminals of the fixing
drawer connector; does the meter
index swing?
THM1: J500-A4 and -A5
THM2: J500-B7 and -B8
THM3: J500-A2 and -A3
THM4: J500-B9 and -B10
Does the index of the meter swing
when the meter probes are
connected to the electrodes on both
ends of the upper heater?
Does the index of the meter swing
when the meter probes are
connected to the electrodes on both
ends of the lower heater?
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