Canon NP6320 Service Manual page 220

CHAPTER 10 TROUBLESHOOTING
10. "E400" indication
Cause Step
1
Circuit 2
breaker (CB2)
3
3-terminal 4
(5V)
power supply
Power supply 5
PCB
Wiring
DC controller 6
PCB
ADF
controller
PCB
10-42
Download Service Manual And Resetter Printer at http://printer1.blogspot.com
Checks
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 J112-1 and the (−)
lead to J112-4. Is the voltage approx.
24V?
Does the problem disappear when the DC
controller PCB or ADF controller PCB is
replaced?
COPYRIGHT © 1999 CANON INC.
YES/
NO
YES
YES
YES
YES
NO
YES
YES
NO
CANON NP6320 REV.0 DEC. 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
breaker (CB2). If it is
normal, replace the 3-
terminal (5V) power
supply.
Replace the power sup-
ply PCB.
Check the wiring from
the AC driver/DC power
supply to the ADF con-
troller.
End.
Replace the cable be-
tween the DC controller
PCB and the ADF con-
troller PCB.