Circuit Diagram (Main Pcb Assy/Beam Control Block); Circuit Diagram (Main Pcb Assy/Keyscan Block) - Roland Va-7 Service Notes

+12V R117 R118
68KS 12KS
R116
820KS
R119
2K2S
D15
DAP20 2K
3
R120
10KS
R121
68KS
D12
DAP202 K
3
+12V -12V 5VD
R122
CN21 120KS
53014 -0710
D13
1 PULSE R123 C162
DAN202K
2 8200p F
1KS
3 1 2
4
P.5 5%
5 R124 R130
NIU
6 120KS
R129
7 BEAM
100 KS
To CN15 on D-BEAM B.
D A
A
C160
C163
47pF S
15pFS
6
R125 7
C161
4K7S 5
47nF
-
P.5 5%
IC26B
UPC4570G
A
PULSE:
FREQUENCY:6.84KHz
DUTY:12.5%
PULSE WIDTH:18.3uS
PULSE
5VD IC29B
C174
IC30 74HC10
100nFs TC7SU04F FLAT
9
13 11 3 10
A Q A
10 4 6 11
D QB
1 9 5
QC
XRST
2 4 12 8
XRST CLR QD
IC28B
74HC393
FLAT
D
CLK:
FREQUENCY:54.7KHz
DUTY:50%
CLK
BCLK
R133
18KS
C166
100nFs
IC27A
UPC4570G
R132
C165
R134 R136
10KS R135 2
10pFS
100S
6 15KS 33KS 1
7 3
-
R140 5
-
NIU
IC27B
5VD C167
UPC4570G
100nFs
A
R139 +12V D16
DA204 K
47KS
A
CHIP
3 1 3
R138
VR1
47KS
-12V
EVND8AA03B 24
D
IC26A
Q8 C164 UPC4570G
2SK36 8GR 100n F 2
P.5 5% 1
1 2 3 5VD
-
R131
1MS L42
C177
EXCCL45 32U1
100nFs
A A
D14
DAN202K
3
5VD
D
R126
1K5S
R127 IC28C
74HC393
Q7 1 3K3S
2
FLAT
2SA103 7KR
3
R128
33KS
IC27C
UPC4570G IC26C
UPC4570G
-12V
-
-
5VD
+12V -12V
+12V -12V
1 C175
XDBPLS 33uF25s C176 C170 C169
8 2 12
100nFs 100nFs
13
33uF25s
IC29C
C171
C172
74HC10
100nFs A 100nFs A
IC29A
FLAT 74HC10
FLAT
TP16
TP
TP
TP15
A
TP
TP
R137
100S
DBV
DBV
C168 (AN4)
10nF S
D
5VD IC29D
74HC10
L41 A[0..1]
EXCCL45 32U1
D[0..7]
C173
100nFs
D D C97
4n7s
1 3
A Q A
4
QB
5
QC XRD
2 6
CLR QD
XW RL
XKEY
IC28A
D
74HC393 XKEYINT
XRST
10MHz
5VD
RA28
FL4
8X10Ks
5VD
C96 2
ELKS47 1FA
33uF25s 3 1 3
4
C95 5
100nFs 6
D
7
IC10
8
SSC1080F 0B
9
D
RA27
8X10Ks
10MHz 49 24 MK10 2
CLK SC10
BR10
23 3
PR10
22 MK9 4
SC9
A1 BR9
48 21 5
A1 PR9
A0 47 19 MK8 6
A0 SC8
BR8
18 7
PR8
17 MK7 8
SC7
D7 BR7
44 16 9
D7 PR7
D6 43 15 MK6
D6 SC6
D5 BR6
42 14 RA29
D5 PR6
D4 41 13 MK5 8X10Ks
D4 SC5
D3 BR5
40 12 2
D3 PR5
D2 39 11 MK4 3
D2 SC4
D1 BR4
38 10 4
D1 PR4
D0 37 9 MK3 5
D0 SC3
BR3
8 6
PR3
6 MK2 7
SC2
XKEYINT BR2
34 5 8
INT PR2
4 MK1 9
SC1
XRD BR1
36 3
RD PR1
XW RL 35 2 MK0
RA30
WR SC0
XKEY BR0
45 1
8X10Ks
CS PR0
2
T7
31 3
T7
XRST 50 30 T6 4
RESET T6
T5
29 5
T5
28 T4 6
T4
T3
51 27 7
TEST1 T3
52 26 T2 8
TEST2 T2
T1
25 9
T1
32 T0
D
T0
D
C98 NIU
C99 NIU
C100 NIU
C101 NIU
C102 NIU
C103 NIU
C104 NIU
C105 NIU
C152 NIU
C154 NIU
D
CN16
AMPC1-2 716P
MK0 MK0 T0
1 16
BR0 BR0 2 15 T1
MK1 MK1 T2
3 14
BR1 BR1 4 13 T3
MK2 MK2 T4
5 12
BR2 BR2 6 11 T5
MK3 MK3 T6
7 10
BR3 BR3 8 9 T7
MK4
To LEFT CONTACT BOARD
BR4
MK5
BR5
MK6
BR6
MK7
BR7
CN15
AMPC1-2 716P
MK4 1 20 T0
MK8 BR4 T1
2 19
BR8 MK5 3 18 T2
MK9 BR5 T3
4 17
BR9 MK6 5 16 T4
MK10 BR6 T5
6 15
BR10 MK7 7 14 T6
BR7 T7
8 13
MK8 9 12 MK9
BR8 BR9
10 11
T0
T1
To RIGHT CONTACT BOARD
T2
T3
T4
T5
T6
T7
BR0 MK0
C106 NIU
BR1 MK1
C107 NIU
BR2 MK2
C108 NIU
BR3 MK3
C109 NIU
BR4 MK4
C110 NIU
BR5 MK5
C111 NIU
BR6 MK6
C112 NIU
BR7 MK7
C113 NIU
BR8 MK8
C153 NIU
BR9 MK9
C155 NIU
D