McIntosh MCD301, Service Manual

Page: 9 / 26

MCD301
MAIN
750771 SCH 2 OF 3
2
11 12
LEFT
4
1
3
2
G
S
-
+
J11
4
1
3
2
G
S
-
+
J12
2.94k
R100
RIGHT+ FILTER
2.21k
R107
LEFT+ FILTER
RIGHT
UNBALANCED
OUTPUT
RIGHT
OUTPUT
UNBALANCED
LEFT
BALANCED
.1
uF
C
45
10
uF
C
46
.1
uF
C
58
10
uF
C
56
10uF
C62
.1
uF
C
55
10
uF
C
57
47uF
C74
2.94k
R105
100
R104
2.94k
R103
2.94k
R102
100
R101
RIGHT- FILTER
330pF
C83
2.21k
R108
330pF
C81
LEFT- FILTER
2.21k
R106
330pF
C80
1.
33
k
R
11
9
.0
02
2u
F
C
85
1.
33
k
R
11
8
.0
02
2u
F
C
84
.0
01
uF
C
91
.0
01
uF
C
90
.0
01
uF
C
89
.0
01
uF
C
88
47uF
C101
47uF
C100
47uF
C99
10
uF
C
94
47uF
C98
5.62
R122
47uF
C97
47uF
C96
499
R135
499
R134
499
R133
.1uF
C109
499
R132
499
R131
499
R130
3
J10B
2
J10A
.1uF
C108
OUTPUT
BALANCED
OUTPUT
.1
uF
C
47
.1
uF
C
59
.1uF
C75
11
k
R
90
2.21k
R109
330pF
C82
10
uF
C
95
5.62
R123
.1uF
C110
.1uF
C111
2.67k
R116
2.67k
R115
2.67k
R113
2.21k
R95
.1
uF
C
93
2.21k
R99
.0
03
3u
F
C
77
2.67k
R117
1.33k
R121
.0022uF
C87
6
5
7
-
+
U20B FIXED RIGHT
UNBALANCED
OUTPUT DRIVER
2.21k
R98
.0
03
3u
F
C
76
2
3
1
-
+
8
4
B+
B-
U20A
2.67k
R114
2.21k
R97
1.33k
R120
.0022uF
C86
FIXED LEFT
UNBALANCED
OUTPUT DRIVER
.0
03
3u
F
C
78
2.67k
R112
2.67k
R110
47
.5
k
R
12
9
FIXED RIGHT-
BALANCED
OUTPUT DRIVER
FIXED RIGHT+
BALANCED
OUTPUT DRIVER
2
3
1
-
+
8
4
B+
B-
U23A
.1
uF
C
92
47
.5
k
R
12
6
47
.5
k
R
12
5
6
5
7
-
+
U22B
47
.5
k
R
12
4
2
3
1
-
+
8
4
B+
B-
U22A
1 2
3
FN2
18uH
L8
12
13
10
7
8
5
2
3
17
16
19
22
21
24
27
26
9
11
14
1
4
6
20
18
15
28
25
23
MC
MDO
VDD
M\S\
DGND
SCK
PDATA
DSDR
DBCK
IREF
MDI
R\S\T\
DSDL
PBCK
VCC2R
AGND3R
IOUTR+
AGND1
VCOMR
VCOML
AGND2
IOUTL+
IOUTL-
AGND3L
IOUTR-
VCC1
VCC2L
PLRCK
U15
6
5
7
-
+
U21B
2
3
1
-
+
8
4
B+
B-
U19A
.0
03
3u
F
C
79
2.67k
R111
6
5
7
-
+
U19B
2
3
1
-
+
8
4
B+
B-
U21A
47
.5
k
R
12
8
FIXED LEFT-
BALANCED
OUTPUT DRIVER
47
.5
k
R
12
7
FIXED LEFT+
BALANCED
OUTPUT DRIVER
6
5
7
-
+
U23B
3
2
1
Q8
3
2
1
Q9
3
2
1
Q10
3
2
1
Q11
3
2
1
Q12
3
2
1
Q13
100
R136
100
R137
100
R139
100
R138
100
R140
100
R141
1k
R142
1k
R143
1k
R144
1k
R145
1k
R146
1k
R147
47uF
C103
47uF
C104
47uF
C102
47uF
C105
47uF
C106
47uF
C107
OMUTE
-12VA -11.5VA
12VA 11.5VA
LEFT+
LEFT-
RIGHT+
RIGHT-
-11.5VA
11.5VA
11.5VA
-11.5VA
11.5VA
-11.5VA
11.5VA
-11.5VA
-11.5VA
11.5VA
-11.5VA
2
3
1
-
+
8
4
B+
B-
U17A
6
5
7
-
+
U17B
.0022uF
C66
.0022uF
C67
36
5
R
91
365
R86
36
5
R
92
365
R87
470uF
C70
470uF
C71
150
R78
150
R80
2.67k
R79
2.67k
R81
10
0p
F
C
65
FIXED
FIXED
FIXED
FIXED
2
3
1
-
+
8
4
B+
B-
U18A
6
5
7
-
+
U18B
.0022uF
C68
.0022uF
C69
36
5
R
93
365
R88
36
5
R
94
365
R89
470uF
C72
470uF
C73
150
R82
150
R84
2.67k
R83
2.67k
R85
10
0p
F
C
64
11.5VA
-11.5VA
11.5VA
-11.5VA
LEFT- I/V
CONVERTER
LEFT+ I/V
CONVERTER
RIGHT- I/V
CONVERTER
RIGHT+ I/V
CONVERTER
5VA
47uF
C60
47uF
C61
10k
R77
47.5
R67
3.3VA
G
N
D
2
E/
D
1
O
U
T
3
VD
D
4
Y2
12
GND
13
A13
15
A15
17
CLK1/I
18
B0
20
22
43
A0/GOEO
44
41
38
39
36 34
11
9
VC
C
O
6
A8
7
A7
4
TD
I
1
A5
2
A9
8
10
A12
14
A6
3
G
N
D
5
A14
16
CLK2/I
19
B1
21
42
35
37
40
23
25 27 28 30 32 33
24
26 29 31
A1
45
A2
46
A3
47
A4
48
U14
10
0u
F
C
53
.1
uF
C
54
1 2
3
FN3
47
.5
R
75
47
.5
R
76
10
k
R
73
.1
uF C5
1
.1
uF
C
44
.1
uF C4
3
.1uF
C50
10
0p
F
C
48
10
0p
F
C
52
10
0p
F
C
49
J8 1
J8 2
J8 3
J8 4
J8 5
J8 6
J8 7
J8 8
J8 9
J8 10
J8 11
J8 12
J8 13
J8 14
J8 15
J8 16
J8 17
J8 18
J8 19
J8 20
J8 21
J8 22
J8 23
SPDIF
GND
MUTE
GND
DSDL/PDL
DSDR/PDR
GND
PLRCK
GND
GND
MS
MDI
MC
MDO
RST
PURE DIR
MODE3
GND
MCLK
GND
MCK2
GND
DBCK
MODE
PBCK
J8 25
J9
1
J9
2
J9
3
J9
4
J9
5
J9
6
J9
7
J9
8
J9
9
J9
10
2K R7
4
47
uF
C
42
33
2
R
72
10
0p
F
C
41
3.3VD
22.1
R57
22.1
R58
22.1
R59
22.1
R60
22.1
R62
22.1
R69
22.1
R71
47.5
R70
J8 24
2
3
1
12 13
4 5
VL VDD
VSS GND
U16A
15
14
16
U16B
10
11
9
U16C
7
6
8
U16D
-11.5VA
11.5VA
.1
uF C6
3
47.5
R66
47.5
R65
47.5
R64
47.5
R63
SPDIF
MUTE
8x47k
2 3 4 5 6 7 8 9
1 R68
47.5k
R61
2.55k
R96
CX251 25
CX251 24
CX251 23
CX251 22
CX251 21
CX251 20
CX251 19
CX251 18
CX251 17
CX251 16
CX251 15
CX251 14
CX251 13
CX251 12
CX251 11
CX251 10
CX251 9
CX251 8
CX251 7
CX251 6
CX251 5
CX251 4
CX251 3
CX251 1
CX251 2
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
-4.4V
-4.4V
-4.4V
-4.4V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V