Canon PC920 Service Manual page 333

CHAPTER 11 TROUBLESHOOTING
15 DC power fails to turn on.
Cause Step
AC power 1
supply
Wiring, DC 2
load
Fuse 3
Composite
power
supply PCB
1 1 - 6 8
11-68
Checks
Is AC power present between J201-1
and -2 on the composite power supply
PCB?
Turn off the power switch, and discon-
nect J202 and J205 from the composite
power supply PCB.
Set the meter range to 30 VDC, and
turn on the power switch. Is the
voltage between the following termi-
nals normal?
Connector Pin
J202 1
2
3
4
5
6
J205 1
2
3
4
Table 11-401
Is the fuse (FU102) on the composite
power supply PCB blown?
120V model:
220/240V model: 250 V, 2.5 A
COPYRIGHT © 1999 CANON INC.
Output Remarks
GND To DC
24V controller
5V PCB
5V
GND
24V
- To main
- motor
GND driver
24V PCB
125 V, 5 V
CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
YES/NO Action
NO See "AC power fails
to turn on."
YES See the descriptions
under "E0."
YES Remove the cause of
the problem, and
replace the fuse.
NO Replace the composite
power supply PCB.