Troubleshooting For Indoor Unit - Toshiba RAS-24UKX 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)
of indoor control
board blown?
Is voltage
(DC 12V or 5V)
NO
indicated on
rear of indoor
control board
normal?
Is DC
Refer to
310 – 340V
NO
<Primary check>
suppalied to
or this praoblem
primary side of
is one step short
transfer switch?
of power P.C.
board block.
YES
Are DC 15V,
DC 12V and
DC 7V Turn off breaker
NO
supplied to once and turn it on
secondary
againa 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
NO
pressing
[START/STOP]
button on
remote control?
YES
Parts (R21,
R22, SG01,
YES
C15, C01, DB01,
C02, IC01
and T01) are
NO
defective.
YES
Are DC 15V,
DC 12V and
DC 7V
supplied to
secondary
side of
transfer
switch?
YES
Does
transmission
mark on
NO
remote control
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.
– 43 –
FILE NO. SVM-01010
Operation
Check item
Conceivable principle
cause
Measure
Item by symptoms
Remote control is
defective.
Refer to 9-9
"Troubleshooting for
Remote Control."
Unit operates
normally.
YES
Replace main
P.C. board.
Replace motor.