McIntosh C50 - Page 10

15 16
DISPLAY 751113 SCH 3 of 4
2
0V
0V
0V
0V
0V
-.5V
0V
0V
1
1
1
0V
0V
0V
-.5V
1
0V
0V
LEFT
LEFT
-3.7V
-.5V
1K
R115
LEFT
METER DRIVER
LEFT METER
RIGHT -
RIGHT +
LEFT -
J22:2
RIGHT
LEFT
47uF
C5
RIGHT
.1UF
C64
1K
R94
47uF
C65
D14
220uF
C69
D6
D7
D11
RIGHT
D10
D9
D13
D12
3
1
2
Q39
METER DRIVER
1K
R114
LEFT
J23:1
J23:2
LEFT +
J22:1
47.5
R95
D8
3
1
2
Q40
2.21M
R110
2.21M
R111
3
1
2
Q44
3
1
2
Q43
3
1
2
Q45
3
1
2
Q46
RIGHT METER
METER BUFFER
LEFT METER
LOG CONVERTER
METER BUFFER
METER RECTIFIER
.1UF
C71
RIGHT METER
METERON/OFF CONTROL
D5
100K
R99
LOG CONVERTER
1K
R97
2
3
1
8
4
B+
B-
U10:1
.1UF
C67
.1UF
C68
6
5
7
-
+
U11:2
D3
100K
R98
1K
R96
.47uF
C72
.1UF
C73
150K
R105
22.1K
R101
.47uF
C70
221
R108
METER RECTIFIER
150K
R103
22.1K
R100
METER
ON/OFF CONTROL
D4
6
5
7
-
+
U12:2
D2
6
5
7
U10:2
221
R109
3
1
2
Q42
2
3
1
-
+
84
B+
B-
U12:1
3
1
2
Q41
2
3
1
-
+
8
4
B+
B-
U11:1
10K
R116
10K
R117
-5V
10V
10.6V -5V
-5V
10V
10.6V
-5V
2.21
R113
15K
R38
D30
2.21
R112
15K
R37
1K
R249
1K
R250
.01uF
C170
.01uF
C169
221K
R251
221K
R252
10.6V
-5V
none
R76
none
R77
(806 ohm)
(806 ohm)
10
BYPASS
J4:12
J4:10
J4:11
J4:1
J4:2
J4:3
J4:4
R-METER
L-METER
TO EQ PCB
DGND
5V
AGND
AGND
L MET ER
R MET ER
R-METER
L-METER
J1:12
J1:11
J1:10
J1:9
J1:3
J1:2
J1:1
5V
EQ BYPASS
METER MUTE
100K
R3
100K
R4
OPEN
R6
15.6V
-15V
15.5V
-15.4V
5k
13
2
CCW
R106
5k
13
2
CCW
R107
10
10
10
10
10
10
0V
0V
0V
4.6V
-.5V
-.5V
0V
0V
10.6V
10.6V
0V
0V
0V
0V
0V
0V
0V
10.6V
-.5V
-4.6V
0V
0V
0V
LEFT METER
ADJUST
RIGHT METER
ADJUST