Canon PC920 Service Manual page 329

CHAPTER 11 TROUBLESHOOTING
6 E064
Cause Step
Wiring 1
High-voltage 2
contact
Transfer 3
charging
roller
Primary 4
charging
roller
High-voltage 5
cable
Composite 6
power
supply PCB
DC control-
ler PCB
7 The keys on the control panel are locked. ('E202')
Cause Step
---------------- 1
Scanner 2
home posi-
tion sensor
(PS1)
DC control-
ler PCB
1 1 - 6 4
11-64
Checks
Turn off and then on the power switch;
then, set the copy count to '1'. Is 'E064'
indicated at the end of a copying run?
Is the connection between the high-
voltage contacts of the machine's top
and bottom units normal?
Is the transfer charging roller or the
contact faulty?
Replace the cartridge. Is the problem
corrected?
Does the high-voltage cable have
scratches or tears?
Replace the composite power supply
PCB. Is the problem corrected?
Checks
Is the scanner in the home position
when 'E202' turns on?
Is the scanner home position sensor
(PS1) normal? (For instructions on
how to check photointerrupers, see p.
11-47.)
COPYRIGHT © 1999 CANON INC.
YES/NO
YES
NO
YES
YES
YES
YES
NO
YES/NO
NO
NO
YES
CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
Check the wiring
between the DC
controller PCB and the
composite power
supply PCB. Check
the wiring between the
composite power
supply PCB and the
high-voltage contact
PCB.
Correct the high-
voltage contacts of the
machine's top and
bottom units.
Replace the transfer
charging roller.
End.
Replace the high-
voltage cable.
End.
Replace the DC
controller PCB.
Action
See "The scanner fails
to move forward."
Check the wiring from
J101 on the DC
controller PCB to PS1;
if normal, replace PS1.
Replace the DC
controller PCB.