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3
LEFT AUDIO
751910 SCH 4 of 5
PH
+5 V
D7
6
2
7
1
PH -
8
14
PH +
K1
8
14
L1 -
7
1
L1 +
6
2
K2
D5
L1
+5 V
8
14
L2 -
7
1
L2 +
6
2
K3
D6
L2
+5 V
J4:3
2
22.1k
R232
J4:2
M ON O -
2
J4:1
M ON O +
2
+7 .5V
-3.5V
C29
C31
.1µF
.1µF
+3 .3V BU
R31
332k
AUD DET
R34
22.1k
1
C26
Q23
.47µF
U7
3
2
+1 7V
IN
OUT(TAB)
+7 .5V
C25
C30
ADJ
R33
.1µF
1k
220µF
R32
1k
+5 V A D C
D4
5.1V
R30
100
+1 7V
+1 2V M
C27
C28
220µF
.1µF
27
R41
200
R39
22.1k
MUTE
R40
22.1k
R42
200
+5 V
K4
D8
MONO
R233
22.1k
-3.5V
3
B-
1
U8:1
B+
2
+7 .5V
R35
10k
U8:2
6
R36
AU DIO DET EC TOR
3.32k
7
+7 .5V
5
U9
2
3
-17V
IN(TAB)
OUT
-3.5V
C32
ADJ
R38
C33
.1µF
1k
220µF
R37
1.58k
R43
2k
+5 V A D C
C38
R47
R53
R64
47µF
1.58k
200
2k
C42
330pF
+1 7V
SOF T M UTING
U11
8
V +
R46
R48
7
100k
ENA
1M
S
3
Q24
G D
2
Vocm
V -
1
R44
C35
R122
475k
.47µF
1M
HS
C43
-17V
-17V
330pF
-17V
C39
R49
47µF
R54
R65
1.58k
200
2k
R59
1k
-17V
R55
2k
2
OUT -
B-
6
U12
R56
B+
2k
3
OUT +
+1 7V
R60
1k
UNBALAN CED CONVER TER
M ETER LOG AM P
D9
R61
10
D10
R62
10
C37
R50
R52
R63
.01µF
1k
82.5k
82.5k
C36
R51
10µF
1k
6
D11
R66
22.1k
7
U10:2
5
C40
47µF
OUT -
R57
22.1k
14
V BIA S
1
2
R58
K5
C34
R45
D12
22.1k
1.2k
100µF
C41
47µF
OUT +
C50
47µF
OUT +
R67
10k
+1 7V
-17V
C45
C48
R78
.1µF
.1µF
4.75k
5
14
8
7
1
4
2
6
K7
R79
R68
4.75k
10k
C51
47µF
OUT -
+1 7V
-17V
D17
C46
C49
OUTPUT
+5 V
.1µF
.1µF
K8
C52
3
2
47µF
4
1
R69
10k
R80
4.75k
+1 2V M
-3.5V
C44
C47
.1µF
.1µF
M ET ER DRIVER
+1 2V M
+1 2V M
2
D15
B+
1
1
U10:1
Q26
B-
3
D13
Q25
D16
-3.5V
2
3
C53
R70
R77
METER CALIBRATION
.1µF
2.21M
221
Apply 1kHz input and adjust the
C54
MP1100 unbalanced output
-3.5V
.47µF
to 2.0V. Adjust R81 for 0dB
on the meter.
R71
R244
332k
47.5K
3
R72
R81
100k
332k
R73
10k
R74
47µF
+7 .5V
3k
C141
2
B+
1
AD C FILT ER
U13:1
B-
3
-3.5V
8
14
8
V BIA S
7
1
7
6
2
6
K6
D14
5
7
U13:2
R75
3k
6
+5 V
+5 V
R76
47µF
10k
C142
28
C55
R89
22µF
100
2
+
RIGH T
3
-
BALAN CED
OUTPU T
1
G
R82
22.1k
D20
J7
R83
22.1k
C56
R90
22µF
100
D18
C57
R91
J8
22µF
100
RIGHT
1
UNBALAN CED
OUTPUT
R84
D19
22.1k
+1 2V M
1
Q27
R92
3.32k
MET +
R93
0
MET -
CCW
1
R85
C145
1.58k
1000pF
C58
2200pF
R248
10
ADC +
R86
75
+7 .5V
-3.5V
C60
C61
.1µF
.1µF
R87
R249
75
10
ADC -
C59
2200pF
C146
1000pF
R88
1.58k
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