Canon CLC 1120 Service Manual page 630

8 E016
Cause
Cleaner blade
reciprocating
motor (M7)
DC driver PCB,
CPU PCB
9 E017
Cause
------------
Duplexing unit
drive assembly
DC fuse PCB
Duplexing motor
(M14)
DC driver PCB,
CPU PCB
COPYRIGHT © 1999 CANON INC.
Step Checks
1 Set the meter range to 30 VDC, and
measure the voltage between
J1028-3 (+; CBRCMA) and J1028-
1 (-; CBRCMB) on the DC driver
PCB. Does it change from about 0
to about 24 V at specific timing
when the Copy Start key is
pressed?
Step Checks
1 Does the duplexing motor rotate at
specific timing during copying?
2 Does the duplexing motor start to
rotate at specific timing during
copying operation?
3 Is there 24 V between J364-1
and -2 of the duplexing motor?
4 Set the meter range to 5 VDC, and
measure the voltage between
J1029-2 (+; DUPMON) and J1029-
3 (-; GND) on the DC driver PCB.
Does it change from about 0 to
about 5 V when the Copy Start key
is pressed and the duplexing motor
starts to rotate?
CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 13 TROUBLESHOOTING
Yes/No
YES Check the wiring from
J1028 to the motor; if
normal, replace the
motor.
NO Replace the DC driver
PCB or the CPU PCB.
Yes/No
YES Go to step 4.
YES Check the duplexing
unit for overload.
NO Check the voltage
between J934-1 and -8
on the DC fuse PCB; if
not 24 V, replace the DC
fuse PCB.
YES Check the wiring from
J1029 to the duplexing
motor; if normal, replace
the duplexing motor.
NO Replace the DC driver
PCB or the CPU PCB.
Action
Action
13-103