Toshiba RAS-B10U2FVG-E Service Manual page 75

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 7V or 5V)
indicated on rear of
indoor control
board normal?
Is DC310–340V
NO
supplied between
CN301 1 – 3 ?
YES
• Be sure to disconnect the motor connector CN301 after shut off the power supply, or it will be a cause of
damage of the motor.
(2) Power 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.
YES
Parts (R01, R02, DB01, C01, C03
IC101 and T101) 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
motor connector
between CN301 1 –
3 short-circuit?
Microcomputer
YES
- 75 -
FILE NO. SVM-18048
Operation
Check Item
Considerable principle cause
Measures
Item by symptoms
NO
Remote controller is defective.
Refer to (5) "Troubleshooting
for remote controller".
Does fan
YES
NO
is defective.
NO
Correct wiring.
To item of
"Power supply is not turned on".
Replace main
P.C. board
Replace fan
motor.