Dc Power Is Absent - Canon NP6330 Service Manual

24

DC power is absent.

Step
Cause
1
AC power
supply
2
Fuse
3
4
DC power suply
PCB
Wiring, DC load
COPYRIGHT © 1997 CANON INC.
Checks
Is AC power present between
J631-1 and J631-4 and J631-2
and J631-5 on the DC power
supply PCB?
Has the fuse on the DC power
supply PCB blown?
Turn off the power switch, and
disconnect the power plug.
Connect the power plug in about 1
min, and turn on the switch. Is DC
power present?
Turn off the power switch, and
disconnect J632, J633, J634, and
J635 from the DC power supply
PCB.
Turn on the power switch, and
measure the voltage between the
terminals shown in Table 11-401.
Is it normal?
CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 11 TROUBLESHOOTING
Action
YES/NO
See "AC power is
NO
absent."
Remove the cause, and
YES
replace the DC power
supply PCB.
End.
YES
Replace the DC power
NO
supply PCB.
Turn off the power
YES
switch, and connect one
of the connectors; then,
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 to
the DC load.
11-87