Midi Pcb Assy & Circuit Diagram - Roland Va-7 Service Notes

1N4148
JK5 L10=L11=L12=SBT0160W
YKF51_5046
R34 220
1 L9
D7
1 4
IN
2
2 3
3 R35 220 C15
4 L10
0.1C
1 4
OUT
5
2 3 R36 220
6 2
L11
7
1 4
THRU
8 R37 220
2 3
9
R38 220
C13
L12 12
0.1C
SBT0460
BC560B
3
5VC 2 Q9
1
IC5E
R41
74LS0 5
10 11
22K
5VC
6N137
IC6
R43
1 8
NC VCC
2 7
LA EN 1K
3 6
LC OUT
4 5
NC GND
5VC C14
0.1C
5VC
5045-09A
R39
IC5A IC5B
74LS05 4K7 74LS0 5
1
1 4 3 M_OUTA 2
3
5VC
4
5
6
R40 5VC 7
IC5F IC5C
74LS05 8
4K7 74LS0 5
9
M_INA
13 6 5
5VC
From CN10 on MAIN B.
R54
IC5D
22K
74LS0 5
C1
R42
XRST
8 9 100uF16
22K
FIX5
FIX4
FIX3
FIX2
FIX1
1N4148
L7
2 1 4
3
1 2 3
CN1
JK2 SBT0160 W
HLJ0520_01_110
IPCTXD1
1N4148
IPCRXD1 SUSTAIN SWITCH
IPCTXD2
IPCRXD2
XRST
+5V
+5V
1N4148
DGND
DGND
L5 R12
2 1 4
3
1K
1 2 3
JK3 SBT0160 W
1N4148
HLJ0520_01_110
FOOT SWITCH 5VC
R31
1K8
R32
470K
3 L6
2
1 SBT0460
JK4
HLJ_0520_01_010
EXPRESSION PEDAL
TP1
TP
TP2
TP
TP3
TP
5VC
D1
R11
22K
3
R10
2 Q1
BC549B
1K 1
D2
C11
1nF
5VC
R13
D3
22K
3
2 Q3
BC549B
1
D4
C12
1nF
EXPJ
CN2
5045-08A
LSSC13 1 LSSC13
SCD7 2 SCD7
SCD6 SCD6
3
-VCC 4 -VCC
VLCD VLCD
5
EXPJ 6 EXPJ
GNDREF GNDREF
7
REF+5 REF+5
8
From CN6 on MAIN B.