Canon CP660 Service Manual page 344

CHAPTER 10 TROUBLESHOOTING
B. After executing test print in service mode, the leading edge of print paper reaches the
secondary transfer belt assembly. Or, the print paper is wrapping around the inter-
mediate transfer drum.
Cause Step
Secondary 1
transfer belt
locking/unlock-
ing drive gear
Secondary 2
transfer belt
locking/unlock-
ing drive cam
Connector 3
(secondary
transfer belt
locking/unlock-
ing clutch CL4)
Secondary 4
transfer belt
locking/unlock-
ing clutch
(CL4)
Connector 5
(drum motor
M2)
Drum motor 6
(M2)
DC controller
PCB
:
Caution
If the cause of the jam is the drum motor, the intermediate transfer drum can lock dur-
ing initial rotation and trigger abnormal noise.
10-62
COPYRIGHT © 1999 CANON INC.
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Checks
Is the drive gear used to transmit
locking/unlocking drive of the sec-
ondary transfer belt worn or
cracked?
Is the drive cam used to transmit
locking/unlocking drive of the sec-
ondary transfer belt worn or
cracked?
Are the connectors J212 on the DC
controller PCB and the relay con-
nector J36 connected securely?
Disconnect the connector J212 of
the secondary transfer
locking/unlocking clutch, and mea-
sure the resistance between the
connectors J212-1 (STRCLD*) and
J212-2 (+24 UH) on the harness
side. Is it about 130 Ω?
Is the connector J224 on the DC
controller PCB connected securely?
Replace the drum motor (M2). Is the
problem corrected?
Yes/No
YES
YES
NO
NO
NO
YES
NO
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
Replace the worn or
cracked part.
Replace the worn or
cracked part.
Connect the connec-
tors securely.
Replace the secondary
transfer belt
locking/unlocking
clutch.
Connect the connector
securely.
End.
Replace the DC con-
troller PCB?