Alto OEX-400, Service Manual

Page: 7 / 37

1 2 3 4 5 6 7 8
A
B
C
D
8 7 6 5 4 3 2 1
D
C
B
A
MAIN SECTION
OEX-400_2.SCH DSP SECTION
OEX-400_3.SCH 7 BAND EQ
OEX-400_4.SCH
EQ HI
10KHZ
LO
C7
47u/25V
3
2
1
U2A
4580M
R124
1M
C100
22P
R4
3K9
R101
8K2
R100
8K2
C87
4N7(M)
R102
8K2
C82
4N7(M)
C8
47u/25V
100HZ
C3
47u/25V
R50
10K
R1
3K9
C4
47u/25V
C64
22P
R2
3K9
R51
10K
C65 22P
C5
47u/25V
3
2
1
U1A
4580M
X1
X2
X3
X1A
XLR&TRS
5
6
4
3
1
2
T
R
S
X1B
XLR&TRS
C1
47u/25V
R19
22K
C2
47u/25V
R20
22K
1
2
3
4
5
6
7
8
9
10
J6
CON10
1
2
3
4
5
6
7
8
9
10
J7
CON10
C13
47u/25V
R6
3K9
C15
47u/25V
R7
3K9
X1
X2
X3
X2A
XLR&TRS
5
6
4
3
1
2
T
R
S
X2B
XLR&TRS
C11
47u/25V
R23
22K
C12
47u/25V
R24
22K
C14
47u/25V
R8
3K9
C27
47u/25V
R12
3K9
X1
X2
X3
X3A
XLR&TRS
5
6
4
3
1
2
T
R
S
X3B
XLR&TRS
C25
47u/25V
R27
22K
C26
47u/25V
R28
22K
CH1-
CH1+
CH2-
CH2+
CH1 XLR INPUT
CH1 TRS INPUT
CH2 XLR INPUT
CH2 TRS INPUT
CH3 XLR INPUT
CH3 TRS INPUT
R52
10K
R91
12K
C66
22P
5
6
7
U1B
4580M
C6
47u/25V
R21
22K
5
6
7
U2B
4580M
R132
36K
C102
22P
C10
47u/25V
R22
22K
R103
8K2
C9
47u/25V
1 3
2
VR1
B50K
1 3
2
VR2
B50K
R3
3K9
1
3
2
VR3
W50K
J1
PRE/POST
R92
20K
1
3
2
VR4
W50K
R53
10K
MAIN-BUS
FX-SEND
EQ HI
10KHZ
LO
C19
47u/25V
3
2
1
U4A
4580M
R125
1M
C101
22P
R5
3K9
R105
8K2
R104
8K2
C88
4N7(M)
R106
8K2
C83
4N7(M)
C21
47u/25V
100HZ
R54
10K
C67
22P
R55
10K
C68 22P
C16
47u/25V
3
2
1
U3A
4580M
R57
10K
R93
12K
C70
22P
5
6
7
U3B
4580M
C18
47u/25V
R25
22K
5
6
7
U4B
4580M
R133
36K
C104
22P
C24
47u/25V
R26
22K
R107
8K2
C22
47u/25V
1 3
2
VR5
B50K
1 3
2
VR6
B50K
R9
3K9
1
3
2
VR7
W50K
J2
PRE/POST
R95
20K
1
3
2
VR8
W50K
R59
10K
MAIN-BUS
FX-SEND
EQ HI
10KHZ
LO
C20
47u/25V
3
2
1
U6A
4580M
R126
1M
C103
22P
R11
3K9
R110
8K2
R109
8K2
C89
4N7(M)
R111
8K2
C84
4N7(M)
C29
47u/25V
100HZ
R61
10K
C72
22P
R56
10K
C69
22P
C17
47u/25V
3
2
1
U5A
4580M
R58
10K
R94
12K
C71
22P
5
6
7
U5B
4580M
C28
47u/25V
R29
22K
5
6
7
U6B
4580M
R134
36K
C105
22P
C30
47u/25V
R30
22K
R108
8K2
C23
47u/25V
1 3
2
VR9
B50K
1 3
2
VR10
B50K
R10
3K9
1
3
2
VR11
W50K
J3
PRE/POST
R96
20K
1
3
2
VR12
W50K
R60
10K
MAIN-BUS
FX-SEND
+VCC3
-VCC3
4
5
2
3
1
X4
SCJ-0658-1-Y
4
5
2
3
1
X5
SCJ-0658-1-Y
1
2
3
4
5
6
7
8
9
10
11
12
J9
CON12
4
5
2
3
1
X7
SCJ-0658-1-Y
4
5
2
3
1
X6
SCJ-0658-1-Y
S
T
R
4
5
2
3
1
X8
SCJ-0658-1-Y
S
T
R
AUX RETURN
FX SEND
FOOTSW
C31
47u/25V
C193
100P C192
100P
C32
47u/25V
R154
120R
8
4
U3C
4580M
8
4
U4C
4580M
8
4
U5C
4580M
8
4
U6C
4580M
8
4
U1C
4580M
8
4
U2C
4580M
C120
0.1u
C126
0.1u
C121
0.1u
C127
0.1u
C122
0.1u
C123
0.1u
C124
0.1u
C125
0.1u
C128
0.1u
C129
0.1u
C130
0.1u
C131
0.1u
+VCC1
-VCC1
+VCC2
-VCC2
+VCC3
-VCC3
R138
10
R141
10
R140
10
R142
10
R143
10
R139
10
+VCC
-VCC
+VCC
-VCC
MOINTOR OUT
HEADPHONE OUT
1
2
3
4
5
6
7
8
9
10
11
12
J8
CON12
HP-OUT-R
HP-OUT-L
MO-OUT-R
MO-OUT-L
AUX-RETURN-L
AUX-RETURN-R
EFFECT-IN
FOOTSW
POWER&DSP
OEX-400_5.SCH
C94
4.7u/50V
C93
4.7u/50V
C92
4.7u/50V
C33
4.7u/63V NP
+VCC2
-VCC2
S
T
R
S
T
R
S
T
R
S1
SW SL2020
R252
22K
R163
22K
C146
47u/25V
1
2 J17
CON2
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
CN500
HEADER 13X2
R500
33R 5W
R501
47R 5W
1
2
3
CN501
CON3
+30VCC
-30VCC
+22VCC
-22VCC
CN501 connect to J14(SCH5)
CN500 connect to POWERMODEII
- 5 -
4. Schematic Diagram