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McIntosh MC462

McIntosh MC462
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MC462
9 10
MAIN 752270 SCH 1of 3
2
D 27
VOLTAGE LOG AMP
METER D R IVER
+14VML+14VML
6
5
7
U24:2
D 23
D25
D11
D12
D21
2
3
1
84
B+
B-
U26:1
+14VML+15V -5VML-15V
D9
D10
D17
+14VML
-5VML
D19
MUTE
6
5
7
U26:2
L HOLD
-5VML
L CAL 2L CAL 1
-5VML
+1 5V
-1 5V
D5
D6
3.32k
R 48
3.32k
R50
2
3
1
8 4
B+
B-
U23:1
6.81k
R49
AUD IO DET ECTOR
100pF
C21
6
5
7
U23:2
AUD DET
10
R53
33.2k
R57
18.2k
R61
22.1k
R63
100
R 67
3
1
2
Q 16
3
1
2
Q 20
12
3
G
D
S
Q 22
475k
R 70
475k
R 69
1M
R45
1k
R46
5.1V
D7
100k
R55
100k
R59
12
3
G
D
S
Q 18
.2 2µF
C 30
1µF
C 32
1000µF
C26
1000pF
C28
J9 :1
J9 :2
H S OUT L
AUT OF L
12
T1
0.1 1W
R 51
3
1
2
Q 13
3
1
2
Q 14
.1µF
C 19
.1µF
C 24
2
3
1
84
B+
B-
U24:1
+14VML
-5VML
-5VML
.1µF
C 14
.1µF
C 18
-1 5V+1 5V
1k
R41
C U R R EN T LOG AM P
L MET V
221k
R 75
3.32k
R 77
1.5 k
R 78
D 28
VOLT AGE LOG AM P
METER DR IVER
+14VMR+14VMR
6
5
7
U25:2
D 24
D26
D15
D16
D22
2
3
1
84
B+
B-
U27:1
D13
D14
D18
+14VMR
-5VMR
D20
MUTE
6
5
7
U27:2
R HOLD
-5VMR
R CAL 2R CAL 1
-5VMR
10
R54
33.2k
R58
18.2k
R62
22.1k
R64
100
R 68
3
1
2
Q 17
3
1
2
Q 21
12
3
G
D
S
Q 23
475k
R 73
475k
R 72
100k
R56
100k
R60
12
3
G
D
S
Q 19
.2 2µF
C 31
1µF
C 33
1000µF
C27
1000pF
C29
J1 0:1
J1 0:2
H S OU T R
AU T OF R
1
2
T2
0.1 1W
R 52
3
1
2
Q 15
2
3
1
8
4
B+
B-
U25:1
+14VMR
-5VMR
-5VMR
C U R R EN T LOG AM P
R MET V
3.32k
R 79
1.5 k
R 80
L MET V
R MET V
L MET
R MET
12.1k
R 71
+14VMR+15V -5VMR-15V
1k
R47
5.1V
D8
.1µF
C 20
.1µF
C 25
1k
R42
12.1k
R 74
221k
R 76
220µF
C 16
220µF
C 23
220µF
C 15
220µF
C 22
150k
R65
150k
R66
MUTE
12
3
G
D
S
Q 26
68.1k
R43
68.1k
R44
.01µF
C17
33.2k
R97
33.2k
R96

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