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 Control)
(1) Power is not turned on (Does not operate entirely)
NO
Is fuse of indoor control
board blown? (F01)
NO
Is temp. fuse blown?
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?
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 supply
turned on by pressing
[START/STOP] button
on remote control?
YES
YES Parts (R21, R109, SG01,
C15, C01, DB01, C02,
IC01, T01) are defective.
YES
Connection of connecting
wire is 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 control 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
– 55 –
Operation
Check Item
Considerable main cause
Measures
Item by symptom
NO
Remote control error
Refer to the item
of Remote control
check. (p.68)
Replace temp.
fuse set.
Check connecting
wire.
Replace main
board.
Motor is defective.
NO
Correct wiring.
To item of "Power supply
is not turned on".