McIntosh MP1100

15 16
RIGHT AUDIO 751909 SCH 4 of 5
2
OUT -
OUT +
4.75k
R78
22µF
C55
22µF
C56
4.75k
R79
22.1k
R82
22.1k
R83
4
2
3
1
-
+
G
J7
22.1k
R84
22µF
C57
BALANCED
100
R91
100
R89
100
R90
D20
D18
47µF
C51
2k
R55
10k
R68
+1 7V -1 7V
47µF
C50
10k
R67
+1 7V
-1 7V
1
4
6
7
8
2
3
5
B+
B-
U12
10k
R69
47µF
C52
1k
R59
23
14
K8
7
2
14 8
6
1
K7
D17
OUTPUT
1k
R60
4.75k
R80
+7 .5V
-3 .5 V
3.32k
R36
22.1k
R34
3
1
2
Q23
2
3
1
8 4
B+
B-
U8:1
6
5
7
U8:2
.47µF
C26
AUD IO D ETECT OR
+3 .3V BU
332k
R31
10k
R35
1
3
5
2
4
J8
2k
R64
2k
R65
+1 7V
-1 7V
1.58k
R49
1.58k
R47
330pF
C43
330pF
C42
1 2
3
G
D
S
Q24
200
R53
200
R54
47µF
C38
47µF
C39
2k
R56
PH
7
2
1
4
8
6
1
K1
D7
7
2
148
6
1
K2
7
2
148
6
1
K3
L1
+5 V
+5 V
22.1k
R39
22.1k
R40
PH +
PH -
+5 V
UN BALANCED
D19
200
R41
200
R42
7
2 148
6
1
K4
MONO
D8
+5 V
2
3
1
84
B+
B-
U13:1
6
5
7
U13:2
+7 .5V
-3 .5 V
1.58k
R85
7
2
14 8
6
1
K6
ADC 0dB
1.58k
R88
75
R87
75
R86
2200pF
C59
2200pF
C58
D14
ADC -10dB
7
2
14 8
6
1
K5
IN(TAB) OUT
ADJ
1
2 3
U9
.1µF
C32
220µF
C33
1k
R38
1.58k
R37
-3 .5 V-1 7V
220µF
C30
IN OUT(TAB)
ADJ
1
23
U7
1k
R33
+7 .5V
.1µF
C25
+1 7V
1k
R32
D12
+5 V+5 V
.1µF
C60
.1µF
C61
+7 .5V -3.5 V
L A U DIO
D5
.1µF
C49
.1µF
C46
OUT +
OUT -
+5 V
D6
L2
RIGHT
OUT PUT
RIGHT
OUT PUT
M ONO +
M ONO -
L1 +
L1 -
L2 +
L2 -
AUD DET
V BIA S
.1µF
C29
.1µF
C31
+7 .5V -3.5 V
1k
R51
D16
3
1
2
Q26
.1µF
C53
.47µF
C54
221
R77
M ETER LOG AMP
82.5k
R52
M ETER DR IVER
3
1
2
Q25
3
1
2
Q27
+1 2V M+1 2V M
22.1k
R66
D13
D15
D9
D10
D11
2
3
1
84
B+
B-
U10:1
+1 2V M
-3 .5 V
6
5
7
U10:2
3.32k
R92
2.21M
R70
-3 .5V
1k
R50
.01µF
C37
82.5k
R63
100k
13
2
CCW
R81
10µF
C36
10
R62
MET +
.1µF
C28
+1 2V M+1 7V
220µF
C27
5.1V
D4
100
R30
MET -
0
R93
10
R61
AD C FILTER
SOF T M U TING
UN BALANCED CONVERTER
3
3
3
+1 7V -1 7V
.1µF
C48
.1µF
C45
+1 2V M -3.5 V
.1µF
C47
.1µF
C44
J4:1
J4:2
J4:3
+5 V A D C
+7 .5V
MUTE
1M
R48
475k
R44
100k
R46
-1 7V
.47µF
C35
1M
R122
-1 7V
3k
R74
3k
R75
10k
R73
10k
R76
47µF
C141
47µF
C142
221k
R246
221k
R245
47µF
C40
47µF
C41
22.1k
R57
22.1k
R58
OUT -
OUT +
+5 V A D C
2k
R43
1.2k
R45
100µF
C34
V BIA S
332k
R72
332k
R71
47.5K
R244
ADC +
ADC -
10
R249
10
R248
1000pF
C145
1000pF
C146
V +
V -
Vocm
ENA
2
8
1
7
3
5
4
6
9
HS
U11
METER CALIBRATION
Apply 1kHz input and adjust the
MP1100 unbalanced output
to 2.0V. Adjust R81 for 0dB
on the meter.