32PD3000 / 42PD3000
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Schematic Page 2 ; Sound / AV3 Control
IC301 NICAM/A2 sound decoder and audio switch ; MSP3410
supply voltage ; +5V at pin 18 and pin 51
control by ; I2C, SDA at pin 10 and SCL at pin 9
X300 18.432MHz
* NICAM/A2 decoder and sound control
QSS signal is coming from IC100 to pin 58 through amplifier Q308/307. The signal
level at pin 58 should be 0.1 ~ 0.8Vpp.
Sound output L/R at pin 28 and 29 are connected through amplifier Q310/Q312 for L
and Q309/Q311 for R to adjust 500mVrms at PL700 pin 4 and 6 In the condition of AV
sound input 500mVrms, FM modulation 54%
Sound output L/R at pin 28 and 29 are also connected through IC300 TDA7433 and
IC303 to headphone.
* Audio switch
input pin 52 SCART101(AV1) sound L input
pin 53 SCART101(AV1) sound R input
pin 49 SCART102(AV2) sound L input
pin 50 SCART102(AV2) sound R input
pin 46 SCART100(AV3) sound L input
pin 47 SCART100(AV3) sound R input
pin 43 front AV (FRONT) sound L inout
pin 44 front AV (FRONT) sound R inout
pin 55 mono sound input from IC100
output pin 37 SCART101(AV1) sound L output
pin 36 SCART101(AV1) sound R output
pin 34 SCART102(AV2) / SCART3(AV3) sound L output
pin 33 SCART102(AV2) / SCART3(AV3) sound R output
pin 29 Speaker / Headphone/phone sound L output
pin 28 Speaker / Headphone/phone sound R output
output pin 5 SOUND SWITCH for trap of TV input signal
IC300 Basic audio processor ; TDA7433
supply voltage ; +8V at pin 17
control by ; I2C, SDA at pin 19 and SCL at pin 18
Monitor sound L/R outputs for speaker are connected headphone and phone out. IC300
contributes separate volume control
input pin 6 Audio sound L input
pin 5 Audio sound R input
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