Canon PC920 Service Manual page 332

14 AC power fails to turn on.
Cause Step
Power plug 1
---------------- 2
Machine top 3
unit
Power 4
supply
Fuse 5
(FU501)
Fuse 6
(FU102)
Door switch 7
(DS1)
Noise filter 8
PCB
Harness 9
Connector 10
connection 1
Connector 11
connection 2
Control 12
panel PCB
Composite
power
supply PCB
COPYRIGHT © 1999 CANON INC.
Checks
Is the power plug connected to the
power outlet?
Turn on the power switch. Is 'E0'
indicated in the display?
Is the machine's top unit closed
firmly?
Is the rated voltage present at the
power outlet?
Is the fuse (FU501) on the noise filter
PCB blown?
120V model: 250 V, 15 A
220/240V model: 250 V, 6.3 A
Is the fuse (FU102) on the composite
power supply PCB blown?
120V model: 125 V, 5 A
220/240V model: 250 V, 2.5 A
Remove the door switch (DS1), and
connect the meter probes to F1 and F3
or F2 and F4 of the faston of the door
switch. Is the resistance about 0
when the actuator is pressed add about
when it is released?
Is the rated voltage present between
J501-1 and -2?
Is the rated voltage present between
J201-1 and J201-2?
Is there electrical continuity between
J111-15 on the DC controller PCB and
J301-15 on the control panel PCB?
Is there electrical continuity between
J204-1 on the composite power supply
PCB and J104-7 on the DC controller
PCB?
Replace the control panel PCB.Is the
problem corrected?
CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 11 TROUBLESHOOTING
YES/NO
NO Connect the power
plug.
YES See the descriptions
under "E0."
NO Close the machine's
top unit.
NO Inform the user that
the problem is not the
machine's.
YES Remove the cause, and
replace the fuse.
YES Remove the cause of
the problem, and
replace the fuse.
NO Replace the door
switch (DS1).
NO Replace the noise
filter PCB.
NO Check the connectors
and the wiring if they
are normal.
NO Correct the electrical
continuity of J111 on
the DC controller PCB
and J301 on the
control panel PCB.
NO Check the connection
of J104 on the DC
controller PCB and
J204 on the composite
power supply PCB; if
normal, replace the
DC controller PCB.
YES End.
NO Replace the composite
power supply PCB.
Action
11-67