LC78212
1
15
30
1: COM
2: IN
3: OUT
NJM79M12FA
A
1
2
3
4
5
6
7
8
9
B
C
D
E
F
G
H
I
J
K
L
AV-S77
AV-S77C SCHEMATIC DIAGRAM (MAIN)
42
IC301, 302, 305, 307~312, 316: µPC4570HA
Dual OP-Amp
Vcc Vo1 -Vm1 +Vm1 VEE +Vm2 -Vm2 Vo2 Vcc
1
2
3
4
5
6
7
8
9
+
+
-
-
1
2
IC303: TC4052BF
Analog Multiplexers/Demultiplexers
16
10
9
6
8
7
13
12
14
15
11
1
5
2
4
3
X-COMMON
0X
1X
2X
3X
0Y
1Y
2Y
3Y
Y-COMMON
VEE
VSS
INH
B
A
VDD
LOGIC LEVEL CONVER
TER
I/O c O/I
I/O c O/I
I/O c O/I
I/O c O/I
I/O c O/I
I/O c O/I
I/O c O/I
I/O c O/I
IC304: TC9482N
Digital Volume
1dB VR
LATCH
8dB VR
LATCH
3
4
5
1dB VR
LATCH
8dB VR
LATCH
6
7
8
1dB VR
LATCH
8dB VR
LATCH
9
10
11
12
13
14
16
17
22
23
24
25
26
2
1
28
27
21
20
19
18
15
3 TO 7
DECODER
4 TO 13
DECODER
SHIFT REGISTER
(32BIT)
STROBE
GENERATOR
LEVEL SHIFT
SAME AS L
–CH
R–OUT A
R–A–GND A
R–A–GND B
R–A–GND C
CS2
STB
DATA
R–OUT B
R–OUT C
R–IN B
R–IN C
R–IN A
L–OUT A
L–A–GND A
L–A–GND B
L–A–GND C
CS1
GND
CK
L–OUT B
L–OUT C
L–IN A
L–IN B
L–IN C
NC
VSS
VDD
TEST
IC306: LC78212
Analog Function Switch
1
2
3
4
5
6
7
8
30
29
28
27
26
25
24
23
L1
L2
L3
LCOM1
L4
L5
L6
LCOM2
R1
R2
R3
RCOM1
R4
RCOM2
R5
R6
9
10
11
22
21
20
19
16
12
18
17
14
15
13
LEVEL SHIFTER
LATCH
CONTR
OL
SHIFT REGISTER
ZZ
ZZ
ZZ
L7
L8
RES
S
VDD
VSS
VEE
LCOM3
RCOM3
R7
R8
D1
CL
CE
INPUT
OUTPUT
COMMON
IC313: NJM78M12FA
Voltage Regulator
IC314: NJM78M05FA
Voltage Regulator
V
OUT
V
IN
GND
IC315: NJM79M12FA
Voltage Regulator
COMMON
OUTPUT
INPUT
Page 43
TO OPERA
TION
A6
Page 43
TO OPERATION
G7
INPUT
SELECTOR
MUTING
DSP
SELECTOR
SIGNAL SENSOR
DIGITAL VOLUME
★
All voltage are measured with a 10MΩ /V DC electric volt meter.
★
Components having special characteristics are marked
s
and must be
replaced with parts having specifications equal to those originally
installed.
★
Schematic diagram is subject to change without notice.
TC4052BF
1
8
16
NJM78M05FA
NJM78M12FA
TC9482N
1
14
28
2SC2878
PIN CONNECTION DIAGRAM OF TRANSISTORS,
DIODES AND ICS.
2SK304
2SA1674
DTA114ES
1: OUT
2: COM
3: IN
S1NB20
1SR139
1SS133
MTZJ5.1B
MTZJ6.2B
MTZJ27.0B
Anode
Cathode
~
+
~
–
E C
B
E C
B
S G
D
Page 44
FROM DSP
I4
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
J model
only
MAIN L
REAR L
MAIN L
(FRONT L)
LFE (SW)
MAIN L
(FRONT L)
0
0
0
-10.4
0
0
0
11.9
11.9
0.7
0
0
0.7
0
0
-10.4
0
0
0
0
-5.1
0
0
0
0
0
0
11.9
-11.6
12.0
12.0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
12.0
-11.6
0
0
0
0
~
~
10.9
10.9
~
0
0
0
-0.2
-0.2
-0.2
-0.2
-0.2
-10.6
0
12.0
0
0
0
-11.7
0
0
0
0
0
0
0
0
0
0
0
-11.7
0
0
0
0
0
0
0
0
0
0
0
12.1
12.1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
11.9
-5.1
4.7
4.7
0
5.1
0
5.1
0
0
0
5.0
0
9.6
16.0
16.0
-25.4
-29.6
-26.0
-26.0
0
-14.7
-11.7
-17.4
12.1
16.2
-17.7
-0.2
4.8
5.5
5.5
6.1
6.1
0
11.5
-0.2
15.8
0
0
0
-20.4
-29.6
-14.7
-25.4
-0.2
-0.2
AC
26.8
0
0
-0.2
0
0
11.9
0
0
0
0
0
0
0
0
0
0
-11.5
11.9
11.9
11.9
-11.5
0
0
0
0
0
0
0
-11.4
-11.4
11.9
0
0
0
11.9
0
0
0
-11.5
11.9
0
0
11.9
-11.5
0
