McIntosh MCD301, Service Manual

Page: 8 / 26

9 10
MAIN
750771 SCH 1 OF 3
2
(IO
)
(IO
) (OD)
5V
RST
CL
REM IN
.01uF
C14
A0
A1
A3
D
4
D8
IN
MUTE LED
LEV-D
LEV-U
47
5k
R
45
D
5
(IO
)
(O
D
)
(IO
)
.1
uF
C
22
3.3V REGULATOR
POWER
CONTROL
D
6
CONTROL
DATA IN
IR IN
DI
CE
100
R9
100
R10
100
R8
2K
R17
10k
R24
15
K
R
16
M
U
TE
C
O
N
T
10k
R29
D1
47uF
C12
.1uF
C13
.1uF
C20
A2
1000pF
C16
GND
3
B
2
Y
4
A
1
VCC
5
U5
.4
7u
F
C
19
.1
uF
C
38
15
K
R
25
.1uF
C23
10
00
pF
C
26
1u
F
C
28
15
K
R
21
8.25k
R33
.01uF
C36
DRIVER
47
uF
C
32
.1
uF
C
34
47.5
R56
47.5
R55
1 2
L3
D7
1 2
L5
OUT
POWER
100
3 4
R1B
100
3 4
R2B
100
1 2
R2A
0
R6
.1uF
C24
STBY/ON
0
R
14
47
.5
k
R
22
47
.5
k
R
27
10
00
pF
C
21
10
0k
R
30
2
1 3
IN OUT
U13
8.25k
R32
1.
5k
R
34
.1
uF
C
27
4.
75
M
R
38
10
0p
F
C
33
47
.5
k
R
47
47.5
R54
1 2
L4
1.5k
R53
10
00
pF
C
10
5x47k
2 3 4 5 6
1
R7
3 1
2
Q1
3
1
2
Q3
15
K
R
15
15
K
R
11
15
K
R
12
1u
F
C
17
10
0u
F
C
37
47.5k
R18
.1
uF
C
30
562
R52
22.1k
R50
22.1k
R51
1
2
3
4
5
6
U31
47
.5
k
R
37
1k
R49
1 2
L2
2
5
1
J5
2
5
1
J3
10
00
pF
C
11
100
1 2
R1A
22.1
R20
6.0MHz
1 3
2
Y1
15
K
R
13
4.
75
M
R
28
2 1
3
Q7
47
.5
k
R
39
2
5
1
J4
2
5
1
J6
GND
3
B
2
Y
4
A
1
VCC
5
U7
GND
3
B
2
Y
4
A
1
VCC
5
U8
TRIG
6
CTLVOL
3
RESET
4
DISCHG
1
OUTPUT
9
CTLVOL
11
THRS
12
VDD
14
GND
7
OUTPUT
5
THRS
2
TRIG
8
RESET
10
DISCHG
13
U9
P1.2
12
P2.2
13
P2.4
15
P1.1
17
P1.0
18
P
0.
7
19
P
0.
6
20
P
0.
5
22
P
0.
3
24
P
0.
2
25
P1.7
4
P2.1
2
P2.6
27
V
D
D
21
P
0.
4
23
P2.3
14
P
1.
3
11
P
1.
4
10
X
TA
L/
P
3.
1
8
R
S
T/
P
1.
5
6
P
1.
6
5
P2.5
16
X
TA
L/
P
3.
0
9
V
S
S
7
P0.0
3
P0.1
26
P2.7
28
P2.0
1
U2
10uF
C7
.1uF
C8
OPTICAL OUT
.1
uF
C
3
.1uF
C1
COAXIAL OUT
.1uF
C2
15
0p
F
C
5
1 2
3
FN1
2
1
J2
47
uF
C
4
.1
uF
C
6
47
uF
C
9
18uH
L1
332
R4
10
0
R
3
1 3
4 2
T1
1
3
2
GND
VCC
INPUT
OPT1
22
0u
F
C
40
22
0u
F
C
39
100uH
L6
100uH
L7
7
1
6 5
4
2
3
CX
B\
A
Q
R\ Q\
RXCX
16
8
B+
GND
U11A
9
15
10 11
12
14
13
CX
B\
A
Q
R\ Q\
RXCX
U11B
2
1
3
7
B+
GND
14
U10A
5
4
6
U10B
10
9
8
U10C
13
12
11
U10D
SPDIF
5VD
GND
GND
NS5V
NS5V
GND
3.3VD
GND
GND
GND
12VA
-12VA
12VA
-12VA
3.3VD 3.3VA
5VA
POWER
POWER IN
NS3.3V
GND
SCLK
DATAI
CS
REM OUT
0
R5
GND
3
B
2
Y
4
A
1
VCC
5
U3
.1uF
C18
GND
3
B
2
Y
4
A
1
VCC
5
U12
.1
uF
C
31
.1
uF
C
35
47
.5
k
R
48
1k
R44
2 1
3
Q5
3 1
2
Q4
681
R43
4.75k
R46
10
k
R
40
4.7
R42
4.7
R41
D3
33
00
uF
C
29
3
1
2
Q2
47
.5
k
R
19
-11.5VA
MUTE
4.75k
R23
GND
3
B
2
Y
4
A
1
VCC
5
U4
GND
3
B
2
Y
4
A
1
VCC
5
U6 0
R31
.4
7u
F
C
15
OMUTE
HMUTE
22
uF
C
25
100k
R36
332
R35
D2
2
1
3
7
B+
GND
14
U1A
5
4
6
U1B
10
9
8
U1C
13
12
11
U1D
47
.5
k
R
26
NS5V
GND
INI
GND
J1 1
J1 2
J1 3
J1 4
J1 5
J1 6
J1 7
J1 8
J1 9
J1 10
J1 11
J1 12
J1 13
J1 14
J1 5
J1 16
J1 17
J1 18
J7 1
J7 2
J7 3
J7 4
J7 5
J7 6
J7 7
J7 8
J7 9
J7 10
J7 11
J7 12
J7 13
J7 14
J7 15
J7 16
J7 17
J7 18
GND
GND
10
0k
R
21
0
.4
7u
F
C
15
0
22
0u
F
C
14
8
.1
uF
C
14
9
GNDC
.1uF
C147
*
15K
R208
J4 1 4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4 J4 15
J4 13
J4 11
J4 9
J4 8
J4 7
J4 6
J4 5
J4 14
J4 3
J4 18
J4 17
J4 16
J4 14
J4 12
J4 10
J4 2
J4 1
J4 2
J4 3
J4 4
J4 5
J4 6
J4 7
J4 8
J4 9
J4 10
J4 11
J4 12
J4 13
J4 14
J4 15
J4 16
J4 17
J4 18
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6