The No. 1 Mirror Fails To Operate - Canon GP605 Service Manual

CHAPTER 13 TROUBLESHOOTING
71

The No. 1 mirror fails to operate.

Cause Step
Copyboard glass
Copyboard glass
sensor (PS57)
Cable
Scanner path
Relay PCB
DC controller
PCB
Scanner motor
driver PCB
Scanner motor
(M5)
13-110
COPYRIGHT © 1999 CANON INC.
1 Is the copyboard glass mounted correctly?
2 Measure the voltage of J804-2 on the
scanner motor driver PCB.
• Is it 5 V when the copyboard glass is
mounted?
• Is it 0 V when the copyboard glass is
removed?
3 Is the scanner drive cable routed
correctly?
4 Is the scanner rail free of dirt, and does
the scanner move smoothly when pushed
by hand?
5 Measure the voltage of J801 on the
scanner motor driver PCB. Is it as
indicated?
J801-1: 38 V
J801-3: 12 V
J801-5: -12 V
J801-6: 5 V
6 Measure the voltage of J506-A12 on the
DC controller PCB. Does it change from
0 to 5 V when the control panel power
switch is turned on?
7 Replace the scanner motor driver PCB. Is
the problem corrected?
Checks
CANON GP605/605V REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Yes/No Action
NO Mount the copyboard
so that it turns on the
copyboard glass sensor
(PS57) correctly.
NO If the voltage does not
change when the sensor
is pressed by hand and
the wiring is free of a
problem, replace the
sensor.
NO Route the cable
correctly.
NO Check the rail for dirt
and foreign matter; as
necessary, clean,
lubricate, or correct.
Reference:
If the rail is soiled,
clean it with
alcohol, and apply a
small amount of
silicone oil (FY9-
6010).
NO Check the AC line up
to the relay PCB; if
normal, replace the
relay PCB.
NO Check the wiring; if
normal, replace the DC
controller PCB.
YES End.
NO Replace the scanner
motor (M5).