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3. Buzzer Circuit
Micro computer
(AX-3U)
BUZZER
BZ1
12V
0V
R801
Q302
B.Z
30
When the buzzer is to be activated, buzzer output pin
30
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. 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.
8
7
IC301
(E
2
PROM)
6
5
5V
0V
R302
Micro computer
(AX-3U)
3
4
R305
5V
C301
C302
D304
D303
R303
D302
D301
R306
1
2
4
0V
3
R621
R712
C710
ZD701
0V
0V
R622
Receiver
Unit
R714
R713
12V
27
Micro computer
(AX-3U)
REMOCON I/P