Canon CP660 Service Manual page 328

CHAPTER 10 TROUBLESHOOTING
1 AC power is absent in the printer unit.
Cause Step
Circuit breaker 1
(printer unit)
Printer unit 2
power switch
(SW1; Note 2)
Power supply
(printer unit)
Note:
1: Be sure to wait 60 sec after the circuit breaker has turned on before turning it back
on. Be sure to turn on the power switch and check the AC line for a short circuit and
the condition of the circuit breaker (continuity, and contact resistance) with a meter
before connecting the printer unit power plug to the power outlet.
2: The printer unit power switch (SW1) is blocked by a face cover after turning on the
printer unit at time of installing the reader unit. Do not touch unless this step must
be performed. Be sure to turn it on, and attach the face cover after the work.
10-46
COPYRIGHT © 1999 CANON INC.
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Checks
Remove the power supply of the
printer unit, and measure the resis-
tance between both terminals of the
circuit breaker. Is it 0 Ω?
Remove the power supply of the
printer unit, and connect the probes
to both terminals of the power sup-
ply switch. Is the resistance 0 Ω
when the printer unit power switch
(Note 2) is turn on and ∞ Ω when it
is turned off?
Yes/No
NO
NO
YES
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
Press the button of the
circuit breaker, and
check for electrical con-
tinuity once again; if not
0 Ω, replace the circuit
breaker. (See
Note 1.)
Replace the printer unit
power switch (SW1).
Check the AC power
line and connectors for
poor contact; if normal,
replace the printer unit
power supply.