Schematic Page 2 ; Sound / Av3 Control - Hitachi 32PD3000E Service Manual

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
pin 53
pin 49
pin 50
pin 46
pin 47
pin 43
pin 44
pin 55
output pin 37
pin 36
pin 34
pin 33
pin 29
pin 28
output pin 5
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
pin 5
SCART101(AV1) sound L input
SCART101(AV1) sound R input
SCART102(AV2) sound L input
SCART102(AV2) sound R input
SCART100(AV3) sound L input
SCART100(AV3) sound R input
front AV (FRONT) sound L inout
front AV (FRONT) sound R inout
mono sound input from IC100
SCART101(AV1) sound L output
SCART101(AV1) sound R output
SCART102(AV2) / SCART3(AV3) sound L output
SCART102(AV2) / SCART3(AV3) sound R output
Speaker / Headphone/phone sound L output
Speaker / Headphone/phone sound R output
SOUND SWITCH for trap of TV input signal
Audio sound L input
Audio sound R input
32PD3000 / 42PD3000
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