Toshiba D-VR3SU, Service Manual

Page: 113 / 217

Circuit Operating Descriptions
7-13
7-6 Audio
7-6-1 Input Block
DVD-VR300 has two stereo line input terminals. and internal TV-audio from RF Tuner Block. These three Analog
audio signal source are converted to digital data by Input Block.
Input Block has a Multiplexer (IC801), Input Filter (AIC81, AIC82), and A/D converter (AIC9).
IC203 change it’s output by selection control signal from FIC1 (Front Micom).
The output signal of IC801 are filtered by OP-Amp (AIC81, AIC82).
AIC81 (L-ch) have two op-amp in each.
7-6-2 Output Block
DVD-VR300 has two stereo analog line out terminal, and two digital output terminal.
Decoded signal by DIC1 is inputted to AIC1 (D/A Converter), then filtered and amplified by AIC4 (OP-Amp).
And the digital audio signal (IEC-958) is drived by AIC3 inverter and ouputted in Optical/Coaxial (S/PDIF)
terminal.
Line Input 1
(Rear)
L1-in
R1-in
L2-in
L2-in
Line Input 2
(Front)
TV Audio
(from MTS
block)
RF-R
RF-L
IC801
SV1274
Multiplexer
FIC1
(micro controller)
AIC81
4560 OP-AMP
AIC82
4560 OP-AMP
AIC9
PCM1802
(Audio A/D
Coverter)
SCKI
BCK
LRCK
DOUT
Line out 1
(Rear)
Line out 2
(Rear)
Optical
Out
Coaxial
Out
AIC4
4560 OP-AMP
AIC3
74HCU04
(Inverter for
Digital Out)
AIC1
PCM1742KE
(Audio D/A
Coverter)
L-out
R-out
SCKI
BCK
LRCK
DOUT
ML
MC
MD
DIC1
DMN8602
A/V Processor
(Dolby AC-3
Encoder/Decoder)
IEC958 DATA
Fig. 7-10