Canon GP335 Service Manual page 505

35 E717 (The communication with the copy data controller has a fault.)
Cause
Connector
Harness
Copy data
controller
DC controller
PCB
36 E803 (The output voltage of the composite power PCB has a fault.)
Cause
Wiring
Composite power
supply PCB
(J208)
Continuity
DC controller
PCB
Composite power
supply PCB
COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Step Check
1 Clear the error in service mode
(COPIER>FUNCTION>CLEAR>ERR);
then, turn off and then on the main
power supply. Is the problem
corrected?
2 Is the wiring between the DC
controller PCB and the copy data
controller normal?
3 Is there continuity between J109 of
the DC controller PCB and the
copy data controller?
4 Replace the copy data controller. Is
the problem corrected?
Step Check
1 Turn off and then on the main
power. Is the problem corrected?
2 Does the scanning lamp turn on
when the Copy Start key is
pressed? Or, is it dark after it has
turned on.
3 Is the connection between J111 on
the DC controller PCB and J204 on
the composite power PCB good?
4 Is the connection of the connector
J208 on the composite power
supply PCB normal?
5 Check the 24-VDC line between
J111 and J204. Is its continuity
good?
6 Is there an output of 24 VDC at the
J111-1 and J111-3 on the DC
controller PCB?
CHAPTER 14 TROUBLESHOOTING
Yes/No
YES End.
NO Correct the wiring.
NO Replace the harness.
YES End.
NO Replace the DC
controller PCB.
Yes/No
YES End.
YES • If it does not turn on,
see "The scanning
lamp fails to turn
on."
• If it turns on but is
dark, replace it (its
ends may be
blackened).
NO Correct the connection.
NO Connect it securely.
YES Replace the harness.
NO Replace the DC
controller PCB.
Replace the composite
power supply PCB.
Action
Action
14-87