Judgment Of Trouble By Every Symptom - Toshiba RAS-B10EKVP-E Service Manual

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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 OPERATION indicator flashing?
Is fuse (F01)
of indoor control
board blown?
NO
Is voltage
NO
(DC12V or 5V)
indicated on rear of
indoor control
board normal?
Is DC310–340V
NO
Parts of a power supply circuit
supplied between
CN10 1 – 3 ?
YES
• Be sure to disconnect the motor connector CN10 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
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Turn off power supply once, and
5 second later, turn it on again.
YES
Is it possible to turn on
power supply by pushing
[START/STOP] button
on remote controller?
YES
Unit operates normally.
YES
Parts (R04, R05, DB01, C01,
C03, IC01 and T01) are defective.
YES
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 CN10 1 –
3 short-circuit?
Microcomputer
is defective.
YES
– 69 –
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
Replace main
P.C. board
Replace fan
motor.
NO
Correct wiring.
To item of "Power supply
is not turned on".