The Fixing Heater Fails To Operate - Canon NP6251 Service Manual

CHAPTER 11 TROUBLESHOOTING

54. The fixing heater fails to operate.

Cause Step
Thermal switch 1
(TP1)
Fixing heater 2
(H1, H2)
AC driver PCB 3
DC controller
PCB
11-116
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Checks
Slide out the fixing assembly, and
connect the probes of the tester to
both terminals of the thermal
switch (TP1). Is there electrical
continuity?
Slide out the fixing assembly, and
connect probes of the meter to
both terminals of the fixing heater
(H1, H2). Is there electrical
continuity?
Is the voltage between the
connectors on the DC controller
PCB indicated in the table 5 V?
Heater (+)
Main heater (H1) J102B-5
Sub heater (H2) J102B-3
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
YES/NO
NO Replace the thermal
switch.
NO Replace the fixing
heater.
YES Replace the AC driver
PCB.
NO Replace the DC
controller PCB.
(–)
J102B-1
J102B-1
Action