Alto OEX-400 Service Manual page 10

1 2
D
63HZ FREQUENCY BAND
MN-EQ-OOL-1
R218
5
18K
2 7
6
U23B
W100K
4580V R226
VR24A
MN-EQ-OOL-2 15K
R225
15K
C200
220N
5
W100K
VR24B
C
160HZ FREQUENCY BAND
MN-EQ-OOL-1
R221
3
18K
2 1
2
U24A
W100K
4580V R122
VR25A
MN-EQ-OOL-2 8K2
R121
8K2
C202
220N
5
W100K
VR25B
B
400HZ FREQUENCY BAND
MN-EQ-OOL-1
R223
5
18K
7
2
6
U24B
W100K
R180
4580V
VR26A
MN-EQ-OOL-2 39K
R179
39K
C212
33N
5
A
W100K
VR26B
1 2
3
MN-EQ-OOL-1
MN-EQ-SOURCE
W100K
R227
220N
VR27A
15K
C199 MN-EQ-OOL-2
R174
5K6
W100K
VR27B
MN-EQ-OOL-1
MN-EQ-SOURCE
W100K
R123
220N
VR28A
8K2
C201 MN-EQ-OOL-2
R232
1K2
W100K
VR28B
MN-EQ-OOL-1
MN-EQ-SOURCE
W100K
R181
33N
VR29A
39K
C213 MN-EQ-OOL-2
R234
1K8
W100K
VR29B
3
4 5
1KHZ FREQUENCY BAND
R219
3
18K
2 1
2
MN-EQ-SOURCE
U25A
R231
4580V R230 10N
47K
47K C204
R229
47K
R190
C205
2K7
10N
5
2.5KHZ FREQUENCY BAND
R222
5
18K
2 7
6
MN-EQ-SOURCE
U25B
R49
4580V R48 10N
22K
22K C206
R47
22K
R233
C207
1K
10N
5
6.3KHZ FREQUENCY BAND
R224
3
18K
1
2
2
MN-EQ-SOURCE
U26A
R205
R204 1N
4580V
100K
100K C211
R203
100K
R235
C210
3K3
1N
5
4 5
- 8 -
6 7
16KHZ FREQUENCY BAND
MN-EQ-OOL-1
R220
5
18K
2 7
6
U26B
W100K
4580V R209 1N
VR30A
MN-EQ-OOL-2 27K C208
R208
27K
C209
1N
5
W100K
VR30B
-VCC -VCC8
R152
10
C176 C177
0.1u 0.1u
R263
0R 1/4W
C180 C181
0.1u 0.1u
R153
10
+VCC U23C +VCC8 U24C U25C
4580V 4580V 4580V
6 7
8
D
MN-EQ-SOURCE
R210
27K
R166
2K2
C
C178 C179
0.1u 0.1u
C182 C183
0.1u 0.1u
U26C
4580V
B
A
8