The Fixing Heater Fails To Turn On - Canon PC920 Service Manual

23 The lens fails to turn on.
Cause Step
Lens sole- 1
noid (SL3)
Lens cable, 2
Pulley, Rail
DC power 3
supply
Scanner/lens 4
drive motor
(M2)
DC control
PCB

24 The fixing heater fails to turn on.

Cause Step
---------------- 1
DC control- 2
ler PCB
Composite
power
supply PCB
COPYRIGHT © 1999 CANON INC.
Checks
Does the lens solenoid (SL3) turn on
when the power switch is turned on?
Are the lens cable, pulley, and rail
normal?
Set the meter range to the 30 VDC,
and connect J202-2 (+) and -1 (-) on
the composite power supply PCB. Is
the meter reading about 24 V?
Replace the scanner/lens drive motor
(M2). Is the problem corrected?
Checks
Is 'E0' indicated?
Replace the DC controller PCB. Is the
problem corrected?
CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 11 TROUBLESHOOTING
YES/NO
NO Check the wiring from
J109 on the DC
controller PCB to SL3;
if normal, replace SL3.
NO Check the lens cable,
pulley, and rail; as
necessary, clean the
cable and adjust its
tension.
NO See "DC power fails
to turn on."
YES End.
NO Replace the DC
controller PCB.
YES/NO
YES See the descriptions
under "E0."
YES End.
NO Replace the composite
power supply PCB.
Action
Action
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