Control Pcb Assy F/ D-Beam & Circuit Diagram; Control Pcb Assy - Roland Va-3 Service Notes

1 2 3 4 5 6
A CONTROL PCB ASSY F/ D-BEAM & CIRCUIT DIAGRAM
ASSY 7700609000
B
C
D
E
F
G
View from component side
H
I

CONTROL PCB ASSY

J
K
L
M
N
O
P
Q
R
S
T
U
View from component side
7 8 9 10 11 12
ASSY 7770704001
VA-3
13 14 15 16 17 18
PULSE:
FREQUENCY:6.84KHz
DUTY:12.5%
PULSE WIDTH:18.3uS
Q17
2SC1815GR
PULSE
3
R70
10K
CN15
12V -12V
53014-0710
1
2
3
4
5
6
BEAM
7
From CN21 on MAIN B.
26
19 20 21 22 23 24
5V
R82
10I
C47
12V
0.1C
R77
3K3
C43
R75
R76 1uF25
C48
22 22
R79 R80
1000uF16
1K 10K
5V D215
TPS708
D216
TLN201
7
2
C46
6
150pF
1 2
Q16
3 C49
2SC2235Y
R78 IC10B
1 10nF
100K UPC4570HA
5%
R81
R71 1M
100 R72 R73
R74 1.8 1.8
100
5V
BEAM
Jan, 2001
25 26 27 28 29 30
3
8
2
4
IC10A
UPC4570HA
12V -12V
C45
C44
10uF16
10uF16
C50 C51
0.1C
0.1C