The Fixing Heater Fails To Turn On - Canon 1000 Service Manual

7. TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
46

The fixing heater fails to turn ON.

Cause Step
Connector
Thermal switch
(THS1, THS2)
Thermistor
(THM1, THM2)
Upper heater
(H1)
Lower heater
(H2)
AC harness
7-134
COPYRIGHT © 2001 CANON INC.
Checks
1 Are the fixing drawer connectors
J6410 and J6019 and the connec-
tors J2804 and J2808 on the AC
driver PCB connected?
2 Draw out the fixing unit, and set the
meter to the ×1Ω range. Does the
index of the meter swing when the
probe of the meter is connected to
the terminal of the following connec-
tors of the fixing drawer connector
(J6410)?
J6410-1 and -4
J6410-5 and -8
3 Is there electrical continuity in the
thermal switch?
Set the meter to the ×1Ω range.
4
Does the index of the meter swing
when the probe of the meter is
connected to the following connector
of the fixing drawer connector
(J6019)?
J6019B-7 and -5
J6019B-7 and -6
5 Does the index of the meter swing
when the probe of the meter is
connected to both terminals of the
upper heater?
6 Does the index of the meter swing
when the probes are connected to
both ends of the lower heater?
Yes/No
YES
YES
YES
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
NO Re-connect them.
Go to step 8.
NO Replace the thermal
switch.
Replace the thermistor.
NO Check the installation of
the heater; if normal,
replace the upper heater.
NO Check the installation of
the heater; if normal,
replace the lower heater.
Check the AC harness
inside the fixing assem-
bly.