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3. Buzzer Circuit
When the buzzer is to be activated, buzzer output pin
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. Initial setting (IC301)
The pre-heating operation start value, ratings of the compressor, maximum rotation speed, etc. are preset in
the micro computer.
5. Receive circuit
Infrared signals from the wireless remote controller are received by the light receiving unit and output after being
amplified and shaped.
12V
BZ1
B.Z
0V
5V
8
7
6
5
IC301
2
(E
PROM)
3
1
2
4
0V
R622
Receiver
Unit
R621
– 51 –
Micro computer
(AX-3U)
30
BUZZER
of the micro computer alternates between ON and OFF
30
5V
Micro computer
0V
R302
3
R305
4
12V
27
R712
C710
0V
0V
(AX-3U)
Micro computer
(AX-3U)
REMOCON I/P
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