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i
f
9. Troubleshooting
Wiring diagram for repair
Symptom
A. No indication
appears on LD1
when the power
plug is connecte(
to the power
outlet.
3. Operation key
input is not
accepted,
Procedure
1) Remove the power cord
from the socket, Wait 30
seconds and then turn
the power on again.
2) Measure the voltage
between @ and@ to
check if AC 230V or
AC 240V is supplied
to the power board.
3) Measure voltage to
check if the
power
board is in normal
condition.
~
- @ Approx. DC 5V
4) Measure voltage to
check if the control
board is in normal
condition.
@ - @ Approx. DC 5V
1) Remove the power cord
from the socket. Wait 30
seconds and then turn
the power on again.
Inspection
e
Normalized
YES
when plug in.
YES
e-
YES
\
Normal
+
voltageis
N~
supplied,
b?zs----
I
Start
1
+
Normalized
YES
hen plug in.
I
NO
Cause
Microcomputer
went out of
control due to
external noise,
Poor connection
of CN101.
Poor connection
of connector lead
wire.
Thermal fuse
failure
Power board
failure
Poor connection
of 5-core parallel
wire
Control board
failure
Microcomputer
went out of
control due to
external noise.
Control board
failure
Countermeasure
Normalized
Repair wiring
Repair wiring
Replace thermal
fuse
Replace power
board
Repair wiring
—
Replace control
board
Normalized
Replace control
board
22
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