Canon 1130 Service Manual page 731

CHAPTER 13 TROUBLESHOOTING
56 The cassette heater fails to operate.
Cause
Cassette heater
switch (SW8)
Environment
switch (SW6)
AC fuse PCB
Connector, wiring
Cassette heater
(H4, H5)
Thermal switch
(THS4, THS6)
SSR2 (100/120-V
model only)
DC driver PCB,
CPU PCB
Note: Step 6 applies to the 100/120-V model only.
13-148
COPYRIGHT © 2002 CANON INC.
Step Checks
1 Is the cassette heater switch on?
2 Turn off the environment switch. Is
the problem corrected?
3 Is there electrical continuity
between J14-1 and -3 of the AC
fuse PCB?
4 Are the connection and wiring
between the following connectors
normal?
J15, J16, cassette heater switch,
SSR2 (100/120-V model only),
environment switch
5 Turn off the power switch, and
disconnect the power plug; then,
remove the cassette heater that fails
to operate. Disconnect J52 (H4) or
J53 (H5) of the cassette heater.
Set the meter range to x1Ω, and
connect the meter probes to the
following terminals; does the index
of the meter swing?
Cassette Heater (H4)
J52-1 and -3
Cassette Heater (H5)
J53-1 and -3
6 Mount the cassette heater, and
connect the power plug. Set the
meter range to 12 VDC, and
measure the voltage between
J1025-1 (+; DRHOFF) and J1025-3
(-; GND) of the DC driver PCB. Is
it about 0 V?
CANON CLC1100/1130/1150/1160/1180 REV.2 FEB. 2002 PRINTED IN JAPAN (IMPRIME AU JAPON)
Yes/No Action
NO Turn it on.
YES End. (The heater will
remain powered at all
times.)
NO Replace the AC fuse
PCB.
NO Connect the connector
properly.
NO Replace the cassette
heater.
NO Replace SSR2.
YES Replace the DC driver
PCB or the CPU PCB.
(After replacement,
execute the work under
II. H. 10. or II. H. 1.)