Canon ImageRunner 600 Service Manual page 679

63 The DC power supply fails to operate 1.
Cause
Step
Control panel
power switch
AC power
supply
Wiring
Fuse (FU101)
Wiring, DC load
DC power
supply PCB
COPYRIGHT © 1999 CANON INC.
1 Is the main power lamp on?
2 Is there the rated voltage between J28-1
and J28-5 and between J28-2 and J28-7
on the DC power supply PCB?
3 Is the connection of the cable for the
connector (J1701-4 for overcurrent
detection signal 1) on the relay PCB
normal?
4 Is the fuse (FU101) on the DC power
supply PCB blown?
5 Turn off the main power supply switch.
When the power switch is turned on in
about 3 min, is the voltage between the
relay PCB and the following terminals
normal?
pin
Connector
No.
J1704 1
3
J1705 1
3
5
J1706 1
Note that the outputs in the table assume
that the AC input power has a tolerance of
±10%.
CANON imageRUNNER 600 REV.1 JAN. 2000 PRINTED IN U.S.A.
CHAPTER 13 TROUBLESHOOTING
Checks
Output
Remarks
voltage
12V ±7%,-10%
3.3V ±5%
+8V ±10%
-8V ±10%
15V ±10%
5V ±4%
Yes/No Action
YES See "The DC power
supply fails to operate
2."
NO See "AC power is
absent 2."
NO Correct the connection.
YES Remove the cause that
blew the fuse, and
replace the fuse.
YES Turn off the power
switch, and disconnect
the following
connectors from the
relay PCB: J1711,
J1712, J1714, J1716,
J1718.
Connect one of the
disconnected
connectors, and turn on
the power switch.
Repeat this for all
connectors to find the
connector that turns on
the protection circuit;
then, check the wiring
from that connector
and the DC loads.
NO Replace the DC power
supply PCB.
13-103