CHAPTER 11 TROUBLESHOOTING
COPYRIGHT © 1997 CANON INC. CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
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DC power is absent.
Cause
AC power
supply
Fuse
DC power suply
PCB
Wiring, DC load
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?
Step
1
2
3
4
YES/NO
NO
YES
YES
NO
YES
Action
See “AC power is
absent.”
Remove the cause, and
replace the DC power
supply PCB.
End.
Replace the DC power
supply PCB.
Turn off the power
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.
Содержание NP6330
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