Judgment Of Trouble By Every Symptom - Toshiba RAS-10JKVP-E Service Manual

10-5. Judgment of Trouble by Every Symptom

10-5-1. 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?
Is DC310–340V
NO
supplied to
primary side of
transfer switch?
YES
Are DC15V, 12V
NO Turn off breaker once
and 7V supplied to
and turn it on again
secondary side of
after removing motor.
transfer switch?
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 lamp flash?
YES
Turn off power supply once, and
5 second later, turn it on again.
Is OPERATION lamp flashing?
YES
Is it possible to turn on
power supply by pushing
[START/STOP] button
on remote controller?
YES
Unit operates normally.
YES
Parts (R01, R04, DB01, C01,
C03, IC01 and T01) are defective.
YES
Refer to <Primary check>
or this problem is one step
short of power P.C. board block.
Are DC15V, 12V
and 7V supplied to
secondary side of
transfeor switch?
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 1 and 2
Microcomputer
Transfer swith,
NO
IC (IC01) for
power supply or
fan motor is
YES
YES
– 58 –
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
short-circuit?
NO
is defective.
defective.
NO
Correct wiring.
To item of "Power supply
is not turned on".
Replace main
P.C. board
Replace motor.