McIntosh C2300 - Setup; Operating Setup Modes; Default Settings and Firmware; Trim Level Adjustment

C2300
17 18
MAIN 750761 SCH 5 OF 6
2E
0V
0V
0V
0V
0V
.3V
-.5V
-3.7V
0V
0V
1
1
1
0V
0V
0V
.3V
-.5V
1
0V
0V
LEFT
DGND
-3.7V
LEFT
-3.7V
-3.7V
4.75k
R115
LEFT
METER DRIVER
LEFT METER
RIGHT -
RIGHT +
LEFT -
J22:2
RIGHT
LEFT
47uF
C66
RIGHT
.1 u F
C 64
806
R94
47uF
C65
D 1
220 u F
C 69
D6
D7
D11
RIGHT
D10
D9
D 13
D 12
31
2
Q39
METER DRIVER
4.75k
R114
LEFT
J23:1
J23:2
LEFT +
J22:1
47.5
R95
D8
31
2
Q40
1M
R 110
1M
R 111
3
2
1
Q44
3
21
Q43
31
2
Q45
3
1
2
Q46
RIGHT METER
METER BUFFER
LEFT METER
LOG CONVERTER
METER BUFFER
METER RECTIFIER
.2 2 uF
C 71
RIGHT METER
METER
ON/OFF CONTROL
D5
100k
R99
LOG CONVERTER
806
R97
2
3
1
-
+
8
4
B+
B-
U10:1
.1 u F
C 67
.1 u F
C 68
8
10
9
+
-
U11:3
D3
100k
R98
806
R96
100k
CCW
1
2
3
R107
1uF
C 72
.2 2 uF
C 73
100 k
R 105
22.1k
R101
100k
CCW
1
2
3
R106
1uF
C 70
100
R 108
DGND
METER RECTIFIER
100 k
R 103
22.1k
R100
METER
ON/OFF CONTROL
D4
7
5
6
+
-
U11:2
D2
6
5
7
-
+
U10:2
100
R 109
3
2
1
Q42
1
3
2
+
-
4
11
B+
B-
U11:1
3
2
1
Q41
14
12
13
+
-
U11:4
10k
R116
10k
R117
-5V
10V
10V
-5V
15V
-15V
-5V
10V
METER_MUTE
L_MAIN
R_MAIN
10V
-5V
-15V
15V
2.2 1
R 113
15K
R38
D30
2.2 1
R 112
15K
R37
806
R249
806
R250
.01uF
C170
.01uF
C169
221 k
R 251
221 k
R 252
LEFT METER
ADJUST
RIGHT METER
ADJUST
METER CALIBRATION PROCEDURE
APPLY A 1kHz SIGNAL TO BOTH CHANNELS. ADJUST THE LEVEL FOR 2.5VAC
AT L AND R MAIN UNBALANCED OUTPUT. ADJUST R106 FOR 0dB ON THE
LEFT METER. ADJUST R107 FOR 0dB ON THE RIGHT METER.