Hitachi RAS-18G5 Service Manual page 42

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3. Buzzer Circuit

When the buzzer is to be activated, buzzer output pin

of the micro computer alternates between ON and

OFF repeatedly at 4kHz and Q302 is turned ON/OFF accordingly. A 4kHz voltage is applied to the buzzer

and the diaphragm of the buzzer vibrates to output 4kHz sound.

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.

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Rac-18g5