The Fixing Heater Fails To Operate - Canon NP6330 Service Manual

CHAPTER 11 TROUBLESHOOTING
36

The fixing heater fails to operate.

Cause Step
1
Thermal switch 2
(TSW1)
Fixing heater
3
(H1, H2)
AC harness
DC controller
4
PCB
SSR
5
Harness
11-98
Checks
Turn off the power switch, and open
the delivery assembly.
Remove the connector cover, and
disconnect J3 (3-pin). Set the meter
to the x1K range, and measure the
resistance between J3-1 and J3-3
(main heater) and between J3-1 and
J3-2 (sub heater) on the fixing
assembly side. Does the index of
the meter swing?
Remove the fixing assembly.
Connect the probes of the meter
to both terminals of the thermal
switch. Does the index of the
meter swing?
Connect the probes of the meter
to both terminals of the fixing
heater (main, sub). Does the
index of the meter swing?
If E000, E001, E002, or E003, clear
it in service mode ([4] No.401).
Set the meter to the 12VDC range,
and measure the voltage between
J112-B8 (+; MHRD) and J112-B5 (-)
and between J112-B7 (+; SHRD)
and J112-B5 (-) on the DC controller
PCB. Is it about 5 V when the power
switch is turned on?
Replace the SSR. Is the problem
corrected?
COPYRIGHT © 1997 CANON INC.
YES/NO
YES
NO
NO
YES
NO
YES
NO
CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
Go to step 5.
Replace the thermal
switch.
Caution:
The heater may have
turned on wrongly, the
SSR may be faulty, or
the thermal switch may
have been mounted
wrongly. Be sure to
check after replacement.
The fixing roller or the
separation claws may be
damaged; be sure to
make a check.
Replace the faulty fixing
heater.
Check the AC harness
of the fixing assembly.
Replace the DC
controller PCB.
End.
Check the DC harness
from the DC controller
PCB to the SSR and the
AC harness to the
heater.