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2. Buzzer Circuit
When the buzzer is to be activated, buzzer output pin
OFF repeatedly at 4kHz and Q301 is turned ON/OFF accordingly. A 4kHz voltage/frequency is applied to
the buzzer and the diaphragm of the buzzer vibrates to output 4kHz sound.
3. Initial setting (IC401)
The pre-heating operation start value, ratings of the compressor, maximum rotation speed, etc. are preset
in the micro computer.
4. Receive circuit
Infrared signals from the wireless remote controller are received by the light receiving unit and output after
being amplifi ed and shaped.
of the micro computer alternates between ON and
30
– 62 –
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