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Manuals
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McIntosh Manuals
Amplifier
MC302
Service manual
McIntosh MC302 Service Manual page 19
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:
Owner's manual
(20 pages)
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Owner's manual
(20 pages)
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Contents
Table of Contents
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7
HEATSINK
751293 SCH 1 OF 2
INP
J1:4
INP
5/6
PG ATT
J1:5
PG ATT
5/6
FB COM
J1:1
FB COM
5/6
GND
J1:3
5/6
R70
22.1K
FB 8
J2:3
FB8
8/9
C31
R71
47pF
GND
22.1K
J2:5
8/9
FEEDBACK NETWORK
FB 2
R7
J2:1
FB2
8/9
430 .5 W
C6
R5
100
.001uF
C5
470pF
C27
1000pF
METER V
R1
J3:6
MET V
2
22.1k
MUTE
-18V
J3:5
MUTE
2
PG LT
J3:1
PG LT
2
+15V
R3
J3:3
+15V
2
100
-15V
R4
J3:4
-15V
2
100
PTC
J3:7
PTC
2
GP1
GP2
GP3
R8
R6
10k
R9
4.99k
2
HS OUT
R14
1M
15V
+14V
R15
-20V
1
Q1
150K
-14V
PG LIGHT DRIVER
-14V
R12
475
Q3
-14V
0V
1
PG M UTE DRIVER
Q2
33
MC302
NC
J1:2
C11
R21
R26
1k
1k
47uF
R22
-19.5V
2.21M
-18V
R23
D
3
G
Q5
2.21M
S
AMP M UTING
B-
-20V
+14V
0V
1
Q4
0V
14V
B+
1
U1:1
B-
-14V
R18
-15V
267k
PG DETECTOR
0V
1
R24
0V
6
47.5k
R16
0V
7
U1:2
475
R25
0V
5
47.5k
71.8V
R27
71.6V
+V AMP
47 .5 W
70.5V
69.9V
1
Q7
POS
70V
DIFFERENTIAL
AMP
1
0V
1
Q11
Q13
-.5V
-.5V
0V
D
3
G
Q6
-19.5V
S
-.6V
-70.4V
1
Q8
0V
-71V
1
Q15
POS
CURRENT
-71.6V
SOURCE
B-
B-
B+
B+
71.6V
NEG
CURRENT
SOURCE
71.1V
1
Q16
71.1V
1
Q9
70.5V
.6V
2
.5V
.5V
0V
1
1
Q12
Q14
3
69.9V
NEG
70V
DIFFERENTIAL
-14V
AMP
69.9V
1
Q10
-70.5V
R28
-V AMP
47 .5 W
-71.6V
-71.8V
34
B+
70.6V
D1
1
Q19
POS
VOLTAGE
AMP
D2
3
Q20
69.5V
DRV +
1.8V
3
Q17
-71.1V
B-
B+
3
Q18
-1.8V
DRV -
-69.5V
3
Q21
D3
NEG
VOLTAGE
AMP
1
Q22
D4
-70.6V
B-
Table of
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