Roland Va-7 - EQUALIZER PCB ASSY& CIRCUIT DIAGRAM; AMPLIFIER PCB ASSY

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36
11
VA-7
July, 2000
AMPLIFIER PCB ASSY ASSY 7700401000
View from component side
View from component side
EQUALIZER PCB ASSY& CIRCUIT DIAGRAM
ASSY 7770114000
+12V
-12V
LSEND
AGND
RSEND
LRET
RRET
R
L
REAL PARAMETER CUT
Gain = -4.24dB
f = 3.4KHz
Q = 1.56
A
A
A
A
A
A
2
+
1
2-1
A
A
2
+
1
2-1
A
A
R8
10K
R7
5.6K
R4
NIU
C6
NIU
R11
NIU
R10
12K
R21
10K
R20
5.6K
R17
NIU
R24
NIU
C14
NIU
R23
12K
+
-
IC2C
NIU
84
+
-
IC3C
UPC4570C
84
R1
330
R2
1.5K
R14
330
R16
100K
R15
1.5K
R5
NIU
R6
NIU
R9
NIU
R18
NIU
R19
NIU
R22
NIU
R12
33K
C7
56nF
R13
68K
C8
22pF
R28
1K
R25
33K
C15
56nF
R26
68K
C16
22pF
R27
1K
+
-
IC1C
UPC4570C
84
C1
2.7nF
5%
C3
NIU
5%
C4
NIU
5%
C10
27nF
5%
C9
2.7nF
5%
C11
NIU
5%
C12
NIU
5%
C13
1uF/50
C5
1uF/5 0
R3
100K
C2
27nF
5%
CN1
07JQ-ST
1
2
3
4
5
6
7
1
2
3
4
5
6
7
C18
0.1C
C19
0.1C
C17
0.1C
+
-
IC1A
UPC4570C
2
3
1
+
-
IC2A
NIU
2
3
1
+
-
IC3A
UPC4570C
2
3
1
+
-
IC1B
UPC4570C
6
5
7
+
-
IC2B
NIU
6
5
7
+
-
IC3B
UPC4570C
6
5
7