Equalizer Pcb Assy And Circuit Diagram; Amplifier Pcb Assy - Roland Va-7 Service Notes

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