McIntosh C2500 Service Manual page 19

4 AUDIO
751458 SCH 2 of 5
FROM CONTROL
J12:8 J12:7 J12:6 J12:5
GND
J3:6
6
GND
J3:8
5.0v
6
C90
10µF
DAC_L
J3:12
6
L DAC-L
R85
47.5K
D/A
C91
10µF
DAC_R
J3:10
R 6 DAC-R
K17
1
BAL-L
R86
2
47.5K
C93
J4:1
10µF
D21
1
L
SRVR-L
K18
R95
1
D5
DAC-L
SRVR 47.5K
2
C94
J4:2
10µF
2
R
SRVR-R
D22
R96
D6
47.5K
K19
1
SRVR-L
C95
2
J5:1
10µF
1
L
AUX-L
D23
R97
D7
47.5K
AUX
C96
J5:2
10µF
K20
2 1
R
AUX-R AUX-L
2
R98
D8
47.5K
INPUTS
D24
C97
J6:1
10µF
1
L K21
DVD-L
1
DVD-L
R99
2
D9
DVD 47.5K
C98
J6:2
D25
10µF
2
R
DVD-R
D10 K22
R100
1
47.5K
CD2-L
2
C99
J7:2
10µF
2
L
CD2-R D26
R101
D11
47.5K
CD2
K23
1
C100 CD-L
J7:1
10µF
2
1
R
CD2-L
D27
R102
D12
47.5K
C101
J8:1
K24
10µF
1
1 TUNER-L
L
CD-L
2
R103
D13
CD 47.5K
D28
C102
J8:2
10µF
2
R
CD-R
K25
1
MM-L
R104
D14 2
47.5K
C103
J9:1
10µF
D29
1
L
TUNER-L
K26
R105
1
D15
MC-L
47.5K
TUNER
2
C104
J9:2
10µF
2
R
TUNER-R
D30
R106
D16
47.5K
TUBE PREAMPLIFIER
FROM CONTROL
J12:4 J12:3 J12:2 J12:1 J13:8 J13:7 J13:6 J13:5 J13:4 J13:3 J13:2 J13:1
5V1 5V1 3.3VBU1
5.0v 3.3VBU2
3.3VBU1
5V1
R144
4.75K
R141
1
150K
K27
1 4
4
BAL-R Q40
2 3
3
5.0v
5.0v 1
OUT2DRV
Q37
BAL
3.3VBU1 5V1
K28
1 4
4
DAC-R
2 3
3 R145
5.0v
5.0v 4.75K
R142 1
150K
DAC
Q41
K29
1
OUT1DRV
1 4
4
SRVR-R
2 3 Q38
3
5.0v
5.0v
3.3VBU1 5V1
SRVR
R146
4.75K
K30
R143
1
4 1 4
AUX-R 150K
2 3
3
5.0v Q42
5.0v
1
MAINDRV
AUX
Q39
K31
1 4
4
DVD-R
2 3
3
5.0v
5.0v
DVD
K32
1 4
4
CD2-R
2 3
3
5.0v
5.0v
CD2
K33
4 1 4
CD-R
2 3
3
5.0v
5.0v
C125
CD
10µF
K34
1 4
4 R151
TUNER-R R147
100K
100K
2 3
3
5.0v
5.0v
TUNER
R149
K35 2.21
1 4
4
15V
MM-R
3 2 3
R150
5.0v
5.0v
2.21
-15V
MM
C126
10µF
K36
1 4
4
MC-R
2 3
3
5.0v
5.0v
R148 R152
100K 100K
MC
33
C2500
3.3VBU1
OUTPUT
C132
DECODER
3.3VBU1
.1µF
U13
R196
R199
3.3VBU1
Address=4
1 16
A0 VDD 3.3VBU1
2 15 R176 22.1 3.3VBU2
A1 SDA OUT-SDA
R409
OUTPUT2 R177 22.1
10K 3 14
A2 SCL OUT-SCL
4 13
Q0 NC
5 12
TUBE-LED Q1 Q7 HDPH_MUTE
6 11
OUT1DRV Q2 Q6 MAINDRV
R208
7 10
68.1K
OUT2DRV Q3 Q5
8 9
VSS Q4
1
LISDRV
Q43
MISC I/O
DECODER
3.3VBU2
U14
3.3VBU2
C133 Address=5
1 16
.1µF A0 VDD 3.3VBU2
OUTPUT1
R182 22.1
2 15
3.3VBU2 A1 SDA INP-SDA
3 14 R183 22.1
A2 SCL INP-SCL
4 13
BAL Q0 NC
R209
5 12
LISDRV Q1 Q7
6 11
BAL2DRV Q2 Q6 DAC
7 10
RECOUT Q3 Q5 MONO
8 9 1
VSS Q4 BAL1DRV BAL1DRV
Q44
SOURCE
3.3VBU2
DECODER
3.3VBU2
U15
MUTE
Address=6
1 16
C134 A0 VDD 3.3VBU2
2 15 R187 22.1
.1µF
A1 SDA INP-SDA
R188 22.1 R210
3 14
3.3VBU2 A2 SCL INP-SCL
4 13
SRVR Q0 NC
5 12
AUX Q1 Q7 MM
6 11
DVD Q2 Q6 MC 1
BAL2DRV
7 10
CD2 Q3 Q5 TUNER
8 9
Q45
VSS Q4 CD
5.0v 15V
3.3VBU2
PHONO
DECODER
C135
.1µF
U16
Address=7
1 16
A0 VDD 3.3VBU2
2 15 R197 22.1
A1 SDA INP-SDA
22.1
3 14 R198
A2 SCL INP-SCL
4 13
MC1 Q0 NC
5 12
MC2 Q1 Q7 MM4
6 11
MC3 Q2 Q6 MM3
7 10
MC4 Q3 Q5 MM2
8 9
VSS Q4 MM1
-15VIN
C136
.1µF
R157
3
1k C138
0V
AGND
47µF
C130 B-
1
100pF
B+ 0V
C129
100pF 2
0V
U12:1
15VIN
C137
.1µF
15VIN
C127
-15VIN
R158
5
1k
C139
0V
47µF
C131 7
100pF 0V
C128
100pF 6
0V U12:2
K38
5.0v
4 1
3 2
LISPROC 5.0v
R211
2.21K
R216
1
D31
Q46
5.0v
BAL1CONTROL
R212
4.75K
1 R218
150K K39
4 1
Q47
3 2
R217
RECOUT
5.0v
BAL2CONTROL
R213
4.75K
1
K42
150K
1 4
Q48
2 3
5.0v
K43
1 4
2 3
D33
K37 K41
5.0v
R214 R215
1k D32 1k
3 2
MONO 5.0v
4 1
K40
LISAUD-L LISAUD-R
34
C141
R219
J14:1
10µF
221
1
L
D34
OUT
RECORD
C140
J14:2
10µF
221
2
R
D35
L_TO
11 J1:12
J15:1
LISPROC
GND
11 J1:11
J15:2
GND
J1:10
11
J15:3
R_TO
11 J1:9
J15:4
L_FROM
J1:4
11
J15:9
GND
11 J1:3
J15:10
GND
11 J1:2
J15:11
R_FROM
J1:1
11
J15:12
LISPROC