Judgment Of Trouble By Every Symptom - Toshiba RAS-18N3KCV Service Manual

11-5. Judgment of Trouble by Every Symptom

11-5-1. Indoor Unit (Including Remote Controller)
(1) Power is not turned on (Does not operate entirely)
<Primary check>
1. Is the supply voltage normal?
2. Is the normal voltage provided to the outdoor unit?
3. Is the crossover cable connected properly?
4. Is the fuse (F01) blown?
NO
Is fuse (F01)
of indoor control
board blown?
NO
Is voltage
NO
(DC12V or 5V)
indicated on rear of
indoor control
board normal?
• Be sure to disconnect the motor connector CN31 after shut off the power supply, or it will be a cause of
damage of the motor.
(2) Operation is not turned on though Indoor P.C. board is replaced
<Confirmation procedure>
Turn on power supply.
Does OPERATION indicator flash?
YES
Turn off power supply once, and
5 second later, turn it on again.
Is OPERATION indicator flashing?
YES
Is it possible to turn on
power supply by pushing
[ ] button
on remote controller?
YES
Unit operates normally.
Parts (R01, C01, C02,
YES
R64, C27, DB01)
T01) are defective.
YES
Parts of a power supply circuit
defective.
NO
Is wired correctly to white and
black lead wires of terminal block?
Does transmission mark
NO
on remote controller flash
normally,and is its signal
transmitted properly?
YES
Microcontroller
YES
– 64 –
FILE NO. SVM-12053
Operation
Check Item
Considerable principle cause
Measures
Item by symptoms
NO
Remote controller is defective.
Refer to (5) "Troubleshooting
for remote controller".
is defective.
NO
Correct wiring.
To item of
"Indoor unit is not operated".
Replace main
P.C. board