Canon CLC 1120 Service Manual page 667

CHAPTER 13 TROUBLESHOOTING
46 Pickup operation fails (multifeeder).
Cause
Multifeeder
pickup roller
Multifeeder
pickup clutch
(CL16)
Lifter plate
Multifeeder paper
pickup solenoid
(SL14)
Pickup driver
PCB
DC driver PCB,
CPU PCB
13-140
COPYRIGHT © 1999 CANON INC.
Step Checks
1 Is paper picked up, not slipping
under the pickup roller?
2 Select the multifeeder, and press
the Copy Start key. Does the
multifeeder pickup roller rotate?
3 Does the lifter plate move up when
the Copy Start key is pressed?
4 Connect the + probe of the meter to
J345-B8 on the pickup driver PCB.
Does the voltage change from
about 24 to about 0 V when the
Copy Start key is pressed?
5 Replace the pickup driver PCB. Is
the problem corrected?
Yes/No
YES
NO
NO
YES
YES
NO
CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
Replace the pickup
roller.
Check the wiring; if
normal, replace the
clutch.
Check the lifter plate
drive system; as
necessary, adjust or
replace the plate.
Check the wiring; if
normal, replace the
solenoid.
End.
Replace the DC driver
PCB or the CPU PCB.