McIntosh MA7000 Service Manual

MA7000
17 18
MAIN 750856 SCH 4 of 5
3
1
1
9L
9L
9L
(+)
9L
4
1
1
9L
(-)
9L
TO L HTSNKTO DISPLAY
L THERM
+65V
L DRV FB
AMP
(-)
SOURCE
(-)
SOURCE
(+)
AMP
(+)
AMP
VOLTAGE
VOLTAGE
J25:4
J25:1
J25:2
J25:3
J24:3
-65V
J24G
J24:5
267k
R93
267k
R97
.47uF
C78
.15uF
C79
.047uF
C80
2 5 W
R92
4
R96
10uF
C81
47 .5W
R95
47
.5W
R94
4.75k
R98
100
R103
47uF
C84
475
R111
DIFFERENTIAL
100
R124
100pF
C94
CURRENT
CURRENT
100pF
C93
31
2
Q18
100
R123
DIFFERENTIAL
221k
R126
324
R127
22.1k
R129
AMP
D19
10uF
C87
10uF
C88
.1uF
C90
221k
R134
D23 D25
3
1
2
Q27
FROM L AUTOFORMER FROM L HTSNK
J24A
10k
R101
12.1k
R99
221
R100
1k
R107
6.49k .5%
R102
267k
R110
267k
R114
475
R113
3 1
2
Q19
3
1
2
Q23
3
1
2
Q22
324
R128
D20
.1uF
C99
.47uF
C100
221
R135
METER LOG AMP
LDRV [-]
LDRV [+]
L MET [+]
3
1
2
Q10
6
5
7
-
+
U17B
POWER GUARD
1
2
3
4
LD1
3
1
2
Q9
10uF
C83
2 1
3
S
G
D
Q12
10M
R108
.0068uF
C82
47.5k
R115
47.5k
R116
100
R120
2 1
3
Q17
806
R119
2 1
3
S
G
D
Q13
100
R117
2
1
3
Q25
3.32k
R122
.1uF
C89
100
R106
100
R105
10uF
C95
150k
R132
METER DRIVER
J24:2
J24:6
J9:23
D24
3
1
2
Q11
2
1
3
Q15
2 1
3
Q21
3
2
1
Q24
3.32k
R121
3
21
Q16
806
R118
221k
R125
3
2
1
Q14
3
21
Q20
8
10
9
+
-
411
B+
B-
U18C
31
2
Q26
3
1
2
Q28
2
3
1
-
+
8
4
B+
B-
U17A
L THERM
L B+
L B-
L B+ L B+ L B+
L B+ L B+
L PG
+14L +14L +14L
L B-
L B- L B-
L B- L B-
TURN ON
+15V
-15V
+14L
-14L
+10V
-5V
-5V
+10V+10V
L AMP
+14L
-14L
4
L MET [-]
J9:21
L 8 OHM
FB
L 2 OHM
FB
10uF
C86
1.82k
R112
10k
R109
220uF
C85
365
R104
220pF
C92
2.21M
R136
D22
-5V
+10V
14
12
13
+
-
411
B+
B-
U18D
20K
R133
1k
R131
D21
220uF
C98
47.5
R130
.1uF
C97
.1uF
C96
+10V
-5V
+15V
-15V
D18
THERM
D17
-14L
GND
9L
J24:4
J9:22
4
L MET FB
1pF
C91
-18V

McIntosh MA7000 Specifications

General

Amplifier class	-
Frequency range	20 - 20000 Hz
Audio output channels	2.0 channels
Peak power per channel	250 W
Signal-to-Noise Ratio (SNR)	115 dB
Total Harmonic Distortion (THD)	0.005 %
XLR in	Yes
Purpose	Home
Product color	Black
Connectivity technology	Wired
AC input voltage	120 V
AC input frequency	50 - 60 Hz

Weight and Dimensions

Depth	558.8 mm
Width	444.5 mm
Height	239.7 mm
Weight	44300 g