Troubleshooting For Indoor Unit - Toshiba RAS-24UKHP-ES-1 Service Manual

9-6. Troubleshooting for Indoor unit

9-6-1. Power can not be turned on. (The unit does not operate at all.)
<Primary check>
(1) Is the supply voltage normal?
(2) Is the connection to the AC output OK?
(3) Are the connection of the primary side and the secondary side
of the power transformer inserted into the P.C. board?
(4) Is the fuse (F01) blown?
Is fuse (F01)
control board
Is voltage
(DC 12V or 5V)
NO
indicated on rear
of indoor control
board normal?
Is DC
310 − 340V
<Primary check>
NO
supplied to or this problem
is one step short
primary side
of transfer of power P.C.
board block.
switch?
YES
Are DC 15V,
DC 12V and
DC 7V Turn off breaker
NO
supplied to once and turn it
secondary on again after
side of removing motor.
transfer
switch?
YES
Turn off power supply
once, and 5 second
later, turn it on again.
NO
Is OPERATION
lamp blinking?
YES
Is it possible to
turn on power
supply by pressing
[START/STOP]
button on
remote control?
YES
Parts (R21,
R22, SG01,
YES
C15, C01, DB01,
of indoor
C02, IC01
and T01)
blown?
are defective.
NO
YES
Refer to
Are DC 15V,
DC 12V or
DC 7V
supplied to
secondary
side of
transfer
switch?
Does
transmission
mark on
remote control
NO NO
flash normally,
and is its
signal
transmitted
properly?
YES
Does the
fan motor
connector
between
1 and 2
short-circuit?
NO
Microcomputer
is defective.
Transfer switch,
IC (IC01) for
NO
power supply
or fan motor
is defective.
YES
– 52 –
FILE NO. SVM-03009
Operation
Check item
Conceivable principle cause
Measure
Item by symptoms
Remote control
is defective.
Refer to 9-9
Troubleshooting for
Remote Control.
YES Unit operates
normally.
Replace main
P.C. board.
Replace motor.