Malfunctions - Canon PC920 Service Manual

CHAPTER 11 TROUBLESHOOTING
12 E400
Cause Step
---------------- 1
5V power 2
supply
ADF con- 3
troller PCB
13 E803
Cause Step
Malfunction 1
DC control- 2
ler PCB.
Composite
power
supply PCB
1 1 - 6 6
11-66
Checks
Turn off and then on the power. Is the
probrem corrected?
Set the matter to the 20VDC range,
and connect the + probe to the foot of
the push swich on the ADF controller
PCB and the - probe to the copier
ground. Is the voltage about 5V?
ON
1 2
Figure 11-402
Replace the ADF controller PCB. Is
the problem corrected?
Checks
Turn off and then on the power switch.
Is the problem corrected?
Replace the DC controller PCB. Is the
problem corrected?
COPYRIGHT © 1999 CANON INC.
YES/NO
0
8
YES/NO
CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
YES End. (Check the
wiring between the
copier's DC controller
PCB and the ADF
controller PCB.)
NO Replace the ADF
controller PCB.
YES End.
NO Replace the copier's
DC controller PCB.
Action
YES End.
YES End.
NO Replace the composite
power supply PCB.