Canon CP660 Service Manual page 324

CHAPTER 10 TROUBLESHOOTING
21 E807
Cause Step
Connectors 1
(heat discharge
fan 3 drive
assembly)
Connectors (24 2
V for heat dis-
charge fan 3
drive)
Heat discharge 3
fan 3
Main relay 4
PCB
DC power 5
(printer unit)
22 E808
Cause Step
Fixing assem- 1
bly
Power supply 2
(printer unit)
10-42
COPYRIGHT © 1999 CANON INC.
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Checks
Are the connectors J681 and J682
on the pre-exposure LED relay PCB
and relay connectors J18 and J17,
connectors J645 and J647 on the
main relay PCB, and connector
J227 on the DC controller PCB con-
nected securely?
Are the connectors J641 on the
main relay PCB and J102 of the DC
power supply connected securely?
Does the voltage between the con-
nectors J645-3 (FAN3ON) on the
main relay PCB and J645-1 (GND)
change to about 24 V immediately
after the printer unit is turned on?
Does the voltage between the con-
nectors J641-1 (+24 VB) and J641-4
(GND) change to 24 V immediately
after the printer unit is turned on?
Is DC power present in the printer
unit?
Checks
Replace the fixing assembly. Is the
problem corrected?
Replace the power supply on the
printer side. Is the problem correct-
ed? (The fixing heater drive circuit
or the fixing heater safety circuit is
faulty.)
Yes/No
NO
NO
YES
YES
NO
YES
Yes/No
YES
YES
NO
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
Connect the connec-
tors securely.
Connect them securely.
Replace the heat dis-
charge fan 2.
Replace the main relay
PCB.
See B.4. "DC power
absent in the printer
unit."
Replace the DC con-
troller PCB.
Action
End.
End.
Replace the DC con-
troller PCB.