– 40 –
Q141
L201
12V
IRR
VDD
Fig.2-1
Fig.3-1 Buzzer circuit
2. Receiver Circuit
IRR (light receiver unit) receives the infrared signal from the wireless remote controller. The receiver
amplifie and shapes the signal and outputs it.
3. Buzzer Circuit
When the buzzer sounds, an approx 3.9kHz
square signal is output from buzzer output pin 30
of the microcomputer. After the amplitude of this
signal has been set to 12Vp-p by IC711, it is
applied to the buzzer. The piezoelectric element
in the buzzer oscillates to generate the buzzer’s
sound.
GND
V
OUT
C212
C211
R212
0V
0V
0V
R211
0V
ZD141
R141
R611
C611
0V
RECEIVER I/P
Microcomputer
13
BZ1
R721
12V
IC711
Microcomputer
Buzzer output
16
1
30
BZ
Sound wave
Metal diaphragm
V
Pizoelectric element
V
Fig. 3-2 Buzzer Operation
Summary of Contents for RAC-18YH4
Page 21: ... 19 GRAM 18YH4 RAC 18YH4 CAUTION The marked parts are very important ones for safety ...
Page 23: ... 21 RAS 18YH4 MODEL ...
Page 24: ... 23 RAC 18YH4 MODEL Ｈ８ ３ ０ ３ ９ ＡＸ ８ Ｔ １ ０ ...
Page 27: ... 26 MAIN P W B MARKING ON P W B COMPONENT SIDE SOLDERING SIDE MODEL RAC 18YH4 ...
Page 29: ... 29 button MODEL RAS 18YH4 BASIC MODE 31 33 33 33 37 35 ...
Page 35: ... 38 REFRIGERATING CYCLE DIAGRAM MODEL RAS 18YH4 RAC 18YH4 SUCTION TANK SUCTION TANK ...
Page 99: ...Printed in Japan TSK AW NO 0004E RAS 18YH4 RAC 18YH4 ...
