Ac Power Is Absent - Canon NP6251 Service Manual

30. AC power is absent.

Cause Step
Power plug 1
Power source 2
3
Circuit breaker 4
(CB1)
Power supply 5
cord, Line filter
(LF1)
Front door 6
Front door 7
switch (SW2)
Front door 8
switch (SW2)
Wiring 9
Power supply 10
switch (SW1)
Wiring
COPYRIGHT © 1997 CANON INC.
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Checks
Is the power plug connected to the
power outlet?
Is the rated AC voltage present at
the power source?
Is the rated voltage present
between J301-1 and J301-5,
between J301-3 and J301-5, and
between J302-1 and J302-3?
(J301 and J302 are in the power
supply unit.)
Press the button on the circuit
breaker (CB1). Is AC power
supplied?
Replace the power cord and the
line filter (LF1). Is AC power
supplied?
Is the front door closed securely?
Is the front door switch (SW2)
firmly pressed when the front door
is closed?
Remove the door switch, and
connect the probe of the meter to
door switches 1 and 2 or 3 and 4;
is the resistance 0Ω when the
actuator is pressed and ∞Ω when
released?
Is the wiring connected to the door
switch normal?
Connect the probes of the meter
to both terminals of the power
switch (SW1). Is the resistance
0Ω when the switch is turned on
and ∞Ω when turned off?
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 11 TROUBLESHOOTING
YES/NO Action
NO Connect the power plug.
NO The problem is not the
machine's. Advise the
user.
YES End.
YES End.
YES End.
NO Check the wiring of the
AC power line, and
check the connectors for
poor contact.
NO Close the front door.
NO Adjust the position of the
switch (SW2).
NO Replace the door switch.
NO Connect it correctly.
NO Replace the power
switch.
YES Check the wiring of the
AC power supply line.
Check the connectors for
poor contact.
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