Judgment Of Trouble By Symptom - Toshiba RAS-M13PKVP-E Service Manual

11-5. Judgment of Trouble by Symptom

11-5-1. Indoor Unit (Including Remote Controller)
(1) Power of indoor unit does not turned on
<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?
NO
Is DC310–340V
supplied between
CN10 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 of indoor unit does not turned on though Indoor P.C. board is replaced
<Confi rmation procedure>
Turn on power supply.
Does OPERATION indicator flash?
YES
Turn off power supply once, and
60 second later, turn it on again.
Is OPERATION indicator flashing?
YES
Is it possible to turn on
power supply by pushing
[START/STOP] button
on remote controller?
Y E S
Unit operates normally.
YES
Parts (R01, R02, DB01,
C01, C03, IC01 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
N O
on remote controller flash
normally,and is its signal
transmitted properly?
Y E S
motor connector
between CN301 1 –
3 short-circuit?
Microcomputer
YES
– 79 –
Operation
Check Item
Considerable principle cause
Measures
Item by symptoms
N O
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.