Judgment Of Trouble By Every Symptom - Toshiba RAS-M10YKV-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)
NO
Is fuse of indoor
control board blown (F01)
or R01 open?
NO
Is voltage indicated
NO
on rear of indoor control
board (DC12V or 5V)
normal?
Is DC310 to 340V
NO
applied to primary
side of SW trans.
(T01) applied?
YES
Is DC35V,
Turn "OFF" breaker
NO
DC12V, DC7V
once, and "ON"
applied to secondary
again after removing
side of SW trans.
motor.
(T01) applied?
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 the power supply
once, and turn on it again
after 5 seconds passed.
Does the operation
lamp flash?
YES
Is the power turned
on by pressing
[START/STOP] button
on remote controller?
YES
Parts (R21, R109, SG01,
YES
C15, C01, DB01, C02,
IC01, T01) are defective.
YES
To item of Pre-check or
trouble before power board
Is DC35V,
DC12V, DC7V
applied to secondary
side of SW trans.
(T01) applied?
NO
Is wired correctly to white and black
lead wires of terminal block?
Does send display
NO
of remote controller flash
normally, and is the signal
sent securely?
YES
(No trouble)
Microcomputer
is defective.
SW trans.,
IC (IC01) for
power supply,
or fan motor
YES
YES
– 85 –
Operation
Check Item
Considerable main cause
Measures
Item by symptom
NO
Remote controller
error
Refer to the item of
Remote controller
check. (p.88)
Replace main
board.
Motor is defective.
NO
Correct wiring.
To item of
"Power is not turned on".