– 100 –
YES
NO
YES
NO
YES
YES
NO
NO
YES
NO
YES
YES
NO
NO
4. Only the indoor unit fan does not operate (other functions are normal).
Is a voltage of DC25V-35V generated
between pins
➀ (Blue) and ➄ (Red)
of CN10 when operated in the
"HIGH" fan speed mode?
Is a pulse of about 33Vp-p generated
at the callector of Q904 in the fan op-
eration mode?
Is the voltage collector of Q904 ap-
prox. 0V at this time?
Is the fan PWM (Pulse Width Modula-
tion output (pin of micro computer
set to"Hi" or is the pulse waveform
output when operation mode?
57
Is a voltage of DC 5V generated be-
tween pins
➀
(Blue) and
➂
(Yellow)
of CN10?
Is the resistance between L901 ter-
minals Ω or less?
Replace the indoor unit fan motor
Check whether the P.W.B. pattern is
shorted and replace REG2.
Replace Q903
Replace Q903
Replace L901
Replace Q904.
Replace Q904
Replace the micro computer.
Replace the micro computer.
Perform a final check of operation.
Perform a final check of operation.
The fan cannot be stopped by the re-
mote controller.
Is the fan PWM output (pin of the
micro computer set to "Hi?
57
Is the voltage collector of Q904 ap-
prox. 0V?
Replace the micro computer.
4. The fan speed of the indoor unit fan cannot be changed (other functions are normal)
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