Toshiba RAS-18YKH-E Service Manual page 30

9-3-2. Only the Indoor Fan does not Operate
< Preliminary checks >
Does it neither work in COOL or FAN ONLY operation?
< Checking procedure >
Turn OFF the power
("REMOTE CONTROL" position)
Turn ON the power
("REMOTE CONTROL" position)
Does the fan stop at the
operation stop condition?
YES
Start operation at HIGH cooling
Does the fan rotate?
YES
Change the setting
to LOW cooling
Does the rotating speed
of the fan lower?
YES
Normal
NO
Control P.C. board failure
Does 120V AC or higher
NO
voltage apply to between red and
black lead of the motor?
Turn OFF the power
Is it possible to rotate the
cross flow fan by hand?
Turn ON the power
NO
Stop the
operation
When rotating the
cross flow fan by hand at
the operation stop condition,
is the rotation signal (+12VDC
detected between (2) (gray lead)
and (3) (brown lead) of the motor
connector (PJ13 or CN13)?
(1 pulse/1 revolution)
Motor circuit (D03, Q06, IC01)
or 12V power circuit
(Q03, D01) failure
– 30 –
NO
YES
NO
YES
NO
0V)
YES
Replace the
P.C. board
Motor control
circuit failure
(lC01, 05, D04) or
12V power circuit
(Q03, D01) or
thermal fuse failure.
Repair the
cross flow fan
Replace the
fan motor
Replace the
control P.C. board