Alto OEX-400 Service Manual page 11

1 2
R211
27K
AUX-RETURN-R
R85
10K
R236
DSP-OUT-R
D
R212
10R
27K
AUX-RETURN-L
R87
R86
10K
10K
2
DSP-OUT-L
3
U27A
C214
4580M
56P
U31A
2 1
74HC14 +VCC
U31B
4 3
C63
47u/25V
R183
74HC14
U31C
39K
6 5
R182 D3
1N4148
74HC14 39K
C
-VCC
6
5
+5V
U29A
6 2
Q J
4
CLK
7 3
Q K
B
74HC109
+VCC
R130
C223 1M
100N
R244
2M2
R88
3 7
1
10K
FX-CLIP
U28B
2
U28A
LM393
LM393
A
1 2
3
C215
3N3
C62 TR1
R228
J176
1 3 1
3 1
15K
47u/25V R167 R237
2K2 56K
VR23
R242
2
12K
D4
W50K
1N4148
MUTE
D5
1N4148
7
U27B +5V
4580M
D28
DSP-OUT-L
1N4148
DSP-OUT-R
DSP-IN
+5V
D29
1N4148
R251 R250
-VCC
2K 1K
D7
R129 3
1M
1N4148
7
6
C203
D6 220N
R206 1N4148
7.5K
5
10
D8
6
1N4148
D9
9
R193 R245
470R 820K 1N4148
R131
1M
MUTE
C224
100N
3
4 5
D23
C216
U32
1N4002
1000U/35V LM317T
3
Vin
C217
D24
100N
1N4002
C226
10U/25V
J14
3
2
1
CON3
MAIN-BUS
1000UF/35V
C231
D25
1N4002 C220
100N
D26
2
VIN
1N4002
U34
LM337T
CN1
HEADER 8X2
J15
2 1 +VCC 1
4 3 FX-CLIP 2
6 5 -VCC 3
8 7 4
10 9 +5V 5
12 11 6
14 13 7
16 15 8
9
10
CON10
+5V
U30
4
Q R
U31D U31E
2 8 9 10
DIS TRIG
74HC14 74HC14
5
THR CVolt
NE555 C222 +5V
100N
R90
U31F
10K
12 13
+5V
74HC14
14
Q J
12
CLK 1uF/35V
13
Q K
U29B
R89
74HC109
10K
C225
100N
4 5
- 9 -
6 7
U33
+VCC LM7805CT
2 1 3
+Vout Vin +5V
C218
R238 C228
100N
100R
1000U/25V
R240
1.1K
D27
LED
C227 R241
10U/25V 1.1K
POWER
R239
R243
C229
100R 2k
1000U/25V
C221
100N
3
VOUT
-VCC
+VCC
D18
RED
R185 R186 R187 R188
680R 680R 680R 680R
+5V
R169
4K7
J16
SW1
C232
1
1
2 1U/50V
2
3 -VCC
4
3
5 +5V
4
6
7
4BIT ENCODER
8
9
10
CON10
11
U27C
4580M
SW2A
SW 6PIN
R246
220R
SW2B
SW 6PIN
C233
FOOTSW
6 7
8
+5V
C219
C230
100N
470U/16V
D
C
5
6
-VCC5 -VCC
C184 C186
0.1u 0.1u
B
C185 C187
0.1u 0.1u
+VCC5 U28C +VCC
4580M
A
8