McIntosh MA7000, Руководство по обслуживанию

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19 20
MAIN
750856 SCH 5 of 5
3
1
1
9R
9R
9R
GND
(+)
9R
4
1
1
9R
9R
9R
4
TO
R
H
TS
N
K
TO
D
IS
P
LA
Y
R 8 OHM
R THERM
+65V
R DRV FB
AMP
(-)
SOURCE
(-)
SOURCE
(+)
AMP
(+)
VOLTAGE
VOLTAGE
J27:4
J27:1
J27:2
J27:3
J26:4
J26:3
-65V
J26:7
J26:5
26
7k
R138
26
7k
R142
.4
7u
F
C102
.1
5u
F
C101
.0
47
uF
C103
2 5
W
R137 4 R141
10
uF
C
10
4
47 .5 W
R140
47 .5 W
R139
4.
75
k
R143
10
0
R148
47
uF
C107
475
R156
DIFFERENTIAL
10
0
R
16
9
10
0p
F
C117
CURRENT
CURRENT
10
0p
F
C116
3
1
2
Q38
10
0
R168
DIFFERENTIAL
22
1k
R171
32
4
R173
AMP
10
uF
C110
10
uF
C111
.1
uF
C113
FR
O
M
R
A
U
TO
FO
R
M
E
R
FR
O
M
R
H
TS
N
K
J26:1
10
k
R146
12.1k
R144
221
R145
1k
R150
6.49k .5%
R147
267k
R155
26
7k
R
15
9
475
R158
3
1
2
Q39
3
1
2
Q43
3
1
2
Q42
32
4
R
17
2
RDRV [-]
RDRV [+]
R MET FB
R MET [+]
3
1
2
Q30
2
3
1
-
+
8
4
B+
B-
U19A
POWER GUARD
1
2
3
4
LD2
3
1
2
Q29
10
uF
C
10
6
2
1
3
S
G
D
Q32
10M
R153
.0068uF
C105
47.5k
R160
47.5k
R161
10
0
R166
2
1
3
Q37
80
6
R165
2
1
3
S
G
D
Q33
10
0
R
16
3
2
1
Q45
3.
32
k
R
16
2
.1
uF
C112
100
R152
100
R151
J26:2
J26:6
J9:19
J9:17
3
1
2
Q31
2
1
3 Q35
2
1
3
Q41
3
2
1
Q44
3.
32
k
R
16
7
3
2
1
Q36
80
6
R164
22
1k
R170
3
2
1
Q34
3
2
1
Q40
6
5
7
-
+
U19B
R THERM
R B+
R B-
R B+ R B+ R B+
R B+
R B+
R PG
+14R +14R +14R
R B- R B-
R B-
R B-
R B-
TURN ON
+15V
-15V
+14R
-14R
R AMP
+14R
-14R
4
R MET [-]
J9:20
FB
R 2 OHM
FB
10uF
C109
1.82k
R157
10
k
R154
22
0u
F
C108
36
5
R149
22
0p
F
C115
(-)
AMP
22.1k
R174
D27
221k
R177
D30 D32
3
1
2
Q47
D28
.1
uF
C119
.4
7u
F
C120
22
1
R178
METER LOG AMP
10uF
C118
150k
R175
METER DRIVER
D31
7
5
6
+
-
4
11
B+
B-
U18B
3
1
2
Q46
3
1
2
Q48
+10V
-5V
-5V
+10V +10V
2.
21
M
R179
D29
20K
R176
-5V
+10V
1
3
2
+
-
4
11
B+
B-
U18A
THERM
D26
-14R
1p
F
C114
4
R MET [-]
J9:18
-18V