McIntosh C2300, Service Manual

Page: 10 / 40

15 16
MAIN
750761 SCH 4 OF 6
2D
LEFT
0V
0V
R
R
R
L
L
0V
0V
0V
0V
0V
5V
5V
5V
5V
0V
0V
0V
0V
0V
HDPH
GND
HDPH
GND
1
1
2
5V
MUTE
MUTE
GND
7
7
7
7
7
7
77
7
4B
4B
4B
4B
4B
4B
4B
4B
4B
4B
4B
4B
4B
J2:2
J2:3
J2:4
J2:8
J2:4
J2:3
J2:2
J2:1
L
22
.1
k
R
13
5
22
.1
k
R
13
4
0V
LEFT
5V
5V
0V
0V
0V
0V
0V
0V
0V
GND
HDPH
GND
HDPH
5V
2
GND
7
7
7
7
4B
4B
4B
4B
4B
J2:1
J2:5
J2:6
J2:7
TO
H
EA
D
PH
O
N
E
TO
B
AL
AL
AN
C
ED
P
C
B
(O
U
TP
U
TS
)
0V
RIGHT
.1
uF
C
74
.1
uF
C
75
0V
0V
0V
1
OUTPUTS
1
2
MAIN
1k
R136
BUFFER
0V
INVERTING
BUFFER
0V
0V
RIGHT
HEADPHONE
0V
BUFFER
HEADPHONE
0V
0V
0V
NC
NC
R HDPH
R HDPH
L HDPH
L HDPH
OUTPUT
OUTPUT
OUTPUT
LEFT +
LEFT +
0V
BUFFER
OUTPUT
BUFFER
OUTPUT
100uF
C77
10
k
R
11
8
100uF
C76
2
1
3
4
K19
2
1
3
4
K23
2
1
3
4
K22
10
0k
R
12
4
10
0k
R
12
3
10
0k
R
12
1
10
0k
R
12
0
10uF
C83
0V
10uF
C81
0V
10uF
C80
0V
10uF
C78
MAIN
2
10uF
C87
10uF
C86
10k
R133
10k
R132
1k
R137
RIGHT
0V
10k
R139
LEFT
0V
10k
R138
BUFFER
100
R143
100
R142
NC
NC
OUTPUT
RIGHT -
RIGHT +
RIGHT -
RIGHT +
LEFT -
LEFT -
10
k
R
11
9
2
1
3
4
K20
2
1
3
4
K24
2
1
3
4
K21
10
0k
R
12
5
10
0k
R
12
2
10uF
C82
10uF
C79
221
R127
J21:3
J21:2
J21:10
J21:11
J20:1
J16:18
J16:17
J16:15
J20:5
J16:14
J20:6
J16:13
J16:12
J16:10
J20:10
J16:9
J16:7
J16:4
J20:16
J16:3 J16:3
J20:17
J16:2
J16:1
2
3
1
-
+
8
4
B+
B-
U13:1
2
J17:2
221
R131
2
J19:2
221
R129
1
J19:1
221
R128
1
J17:1
221
R126
6
5
7
-
+
U15:2
INVERTING
J21:1
J21:4
J21:7
J21:6
J21:5
J21:8
J21:12
J20:2
J20:3
J16:16
J20:8
J20:7
33
.2
k
R
14
1 J16:11
100uF
C91
J20:11
J16:8
J20:13
J20:14
33
.2
k
R
14
0
J16:5
J16:6
100uF
C90
J20:18
6
5
7
-
+
U13:2
2
J18:2
221
R130
1
J18:1
2
3
1
-
+
8
4
B+
B-
U15:1
2
3
1
-
+
8
4
B+
B-
U14:1
6
5
7
-
+
U14:2
J20:4
J21:9
J20:12
J20:15
J20:9
L_MAIN
L_MAIN
LMAIN
R_MAIN
R_MAIN
RMAIN
15V -15V
LMAIN
L_MAIN
R_MAIN RMAIN
5V
5V
5V
5V
5V
5V
5V
L_OUT
R_OUT
MUTE
MUTE
SPKR1 SPKR2
SPKR1
SPKR2
R_MAIN
L_MAIN
15V
-15V
15V
-15V
22
0p
F
C
16
3
22
0p
F
C
16
4
2
1
3
4
K27
2
1
3
4
K28
HDPH MUTE
5V
5V
470uF
C165
470uF
C166
1k
R
24
0
1k
R
24
1
221
R243
221
R242
.1
uF
C
85
.1
uF
C
84
10
0u
F
C
16
8
10
0u
F
C
16
7
15V
-15V
15HP
-15HP
-15HP
15HP