Dc Power Is Absent - Canon 1000 Service Manual

36

DC power is absent.

Cause Step
AC powr supply
Right cover
switch (SW2,
SW3)
Wiring, DC load
DC power supply
COPYRIGHT © 2001 CANON INC.
Checks
1
Is AC power present between the
following terminals?
J5327M-1 and J5327M-4 on the
DC power supply PCB 1 (upper)
J5301M-1 and J5301M-3 on the
DC power supply PCB 1 (lower)
J5337-1 and J5337-3 on the DC
power supply PCB
2 Disconnect the power plug, and
check the right cover switch for
electrical continuity. Is it normal?
3 Disconnect all connectors except for
the following:
J5327M on the DC power supply
PCB 1 (upper)
J5301M on the DC power supply
PCB 1 (lower)
J5337 on the DC power supply
PCB 2
Connect the power plug, and turn ON
the power switch. Is the DC power
supply output of the above connec-
tors on the DC power supply normal?
Be careful to avoid shorting
the connectors.
Keep in mind that +24VU
and +214VR are not gener-
ated.
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
7. TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
Yes/No
NO
NO
YES
NO
Action
See "AC power is absent."
Replace the right cover
switch.
Turn OFF the power
switch, and connect one
of the disconnected
connectors; then, turn ON
the power. Repeat this for
all connectors to find out
which connector activates
the protection circuit.
Check the wiring from that
connector to the DC load.
Replace the faulty DC
power supply PCB.
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