8-3
Audio Block Diagram
A7144BLA
MAIN CB
A
IC852
(INPUT SELECT)
SW CTL
INH
3
12
15
11
14
1
4
6
9
10
STEREO
FIL
TER
75uS
DE-EMPH
dBX
DE-EMPH
L+R
FIL
TER
WIDE BAND
FIL
TER
WIDE BAND
RMS DET
WIDE BAND
EXP
AND
SPECTRAL
EXP
AND
SPECTRAL
RMS DET
SPECTRAL
FIL
TER
OFFSET
CANCEL
L-CH
R-CH
MA
TRIX
AG
C
OFFSET
CANCEL
L-R
FIL
TER
(L-R)/SAP
SW
SAP
FIL
TER
I2C
DECORDER
SAP
DEMOD
SAP OUT
FIL
TER
29
30
TO
IF/VIDEO BLOCK
DIA
GRAM
TUNER
TUNER
(L-CH)
(R-CH)
21
27
24
IC851
(MTS/SAP A
UDIO SIGNAL PR
OCESS)
A
UDIO(L)
-IN1
JK704
DIGIT
AL
A
UDIO-OUT
JK1701
SIF
JK705
A
UDIO(R)
-IN1
JK709
A
UDIO(L)
-IN2
JK710
A
UDIO(R)
-IN2
OFFSET
CANCEL
14
IC801
(A
UDIO AMP)
7
V
OLUME
11
AMP
AMP
MUTE
/ST
ANDBY
CONTR
OL
(R-CH)
(L-CH)
2
Q802
JK801
HEADPHONE
JA
C
K
SP801
SPEAKER
R-CH
P-ON+5V(2)
13
2
WF7
A
UDIO1
A
UDIO2
A
UDIO1
A
UDIO2
SIF/BB
SW
INPUT
VCA
SIF
DEMOD
INPUT
-0(INV)
INPUT
-1(INV)
INPUT
-2(INV)
6
DTV
DTV
5
1
DTV
-SPDIF
DTV
-A
UDIO(L)
T
O DTV
MODULE
BLOCK
DIA
GRAM
DTV
-A
UDIO(R)
AUDIO SIGNAL
A
UDIO MUTE
JUNCTION-B CB
A
CL802
SP802
SPEAKER
L-CH
JUNCTION-A CB
A
CL801
22
SP-GND
11
SP-L
22
SP-GND
11
SP-R
SP802
SPEAKER
L-CH
CN802
SP-L
1
SP-GND
2
SP801
SPEAKER
R-CH
CN801
SP-R
1
GND
2
T
O IF/VIDEO
BLOCK DIA
GRAM
T
O SYSTEM
CONTR
OL BLOCK
DIA
GRAM
A
UDIO-MUTE
V
OLUME
SCL
SD
A
A
B
CLN802
CLN801
NOTE: CBA AND PWB MEANS PRINTED WIRING BOARD.
Comparison Char
t of
Models and Marks
Model
Mark
LC-20A
V7U
LC-20SH7U
A
B
