McIntosh MA7000 Service Manual

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 HTSNKTO DISPLAY
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
267k
R138
267k
R142
.47uF
C102
.15uF
C101
.047uF
C103
2 5 W
R137
4
R141
10uF
C104
47 .5 W
R140
47 .5 W
R139
4.75k
R143
100
R148
47uF
C107
475
R156
DIFFERENTIAL
100
R169
100pF
C117
CURRENT
CURRENT
100pF
C116
31
2
Q38
100
R168
DIFFERENTIAL
221k
R171
324
R173
AMP
10uF
C110
10uF
C111
.1uF
C113
FROM R AUTOFORMER FROM R HTSNK
J26:1
10k
R146
12.1k
R144
221
R145
1k
R150
6.49k .5%
R147
267k
R155
267k
R159
475
R158
3 1
2
Q39
3
1
2
Q43
3
1
2
Q42
324
R172
RDRV [-]
RDRV [+]
R MET FB
R MET [+]
31
2
Q30
2
3
1
-
+
84
B+
B-
U19A
POWER GUARD
1
2
3
4
LD2
3 1
2
Q29
10uF
C106
2 1
3
S
G
D
Q32
10M
R153
.0068uF
C105
47.5k
R160
47.5k
R161
100
R166
2 1
3
Q37
806
R165
2
1
3
S
G
D
Q33
100
R163
2
1
Q45
3.32k
R162
.1uF
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
3.32k
R167
3
21
Q36
806
R164
221k
R170
3
2
1
Q34
3
21
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
10k
R154
220uF
C108
365
R149
220pF
C115
(-)
AMP
22.1k
R174
D27
221k
R177
D30 D32
31
2
Q47
D28
.1uF
C119
.47uF
C120
221
R178
METER LOG AMP
10uF
C118
150k
R175
METER DRIVER
D31
7
5
6
+
-
411
B+
B-
U18B
31
2
Q46
31
2
Q48
+10V
-5V
-5V
+10V+10V
2.21M
R179
D29
20K
R176
-5V
+10V
1
3
2
+
-
411
B+
B-
U18A
THERM
D26
-14R
1pF
C114
4
R MET [-]
J9:18
-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