Canon NP6317 Service Manual page 204

CHAPTER 10 TROUBLESHOOTING
9. "E400" indication
Cause/Problem
Procedure
area
1
Circuit 2
breaker (CB2)
3
3-terminal 4
(5V)
power supply
ADF 5
power supply
Wiring
DC controller 6
PCB
ADF
controller
PCB
10-40
Check
Does the problem disappear when the
power is switched OFF and then ON
again?
Does the problem disappear when circuit
beaker CB2 on the ADF controller PCB is
pressed?
Set the meter to the 12VDC range; then,
connect the (+) lead to J10-3 and the (-)
lead to J10-2 of the ADF controller PCB.
Is the voltage approx. 5V?
Set the meter to the 30VDC range; then,
connect the (+) lead to J9-1 and the (-)
lead to J9-2 of the ADF controller PCB. Is
the voltage approx. 24V?
Set the meter to the 30VDC range; then,
connect the (+) lead to J70-2 and the (-)
lead to J70-4. Is the voltage approx. 24V?
Does the problem disappear when the DC
controller PCB or ADF controller PCB is
replaced?
COPYRIGHT © 1999 CANON INC.
Result
Yes
Yes
Yes
Yes
No
Yes
Yes
No
CANON NP6317 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
End. (Check the wiring
between the DC control-
ler and the ADF control-
ler.)
End. (Be sure to deter-
mine why CB2 went
OFF.)
Check from step 6.
Check the continuity
through the circuit bea-
ker (CB2). If it is nor-
mal, replace the 3-termi-
nal (5V) power supply.
Replace the ADF power
supply PCB.
Check the wiring from
the ADF power supply to
the ADF controller.
End.
Replace the cable be-
tween the DC controller
PCB and the ADF con-
troller PCB.