Roland Va-7 - POTENTIOMETER PCB ASSY & CIRCUIT DIAGRAM; LCD CONTROL PCB ASSY & CIRCUIT DIAGRAM

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27
11
VA-7
July, 2000
POTENTIOMETER PCB ASSY & CIRCUIT DIAGRAM
ASSY 7770106000
View from component side
LCD CONTROL PCB ASSY & CIRCUIT DIAGRAM
ASSY 7770101000
View from component side
+25.5V
TO graphic LCD
From CN23 on MAIN BOARD
YD
LP
XSLC
DISPON
XD0
XD1
XD2
XD3
To Touch Screen
TOUCHX
TOUCHY
TOUCH0
TOUCH1
TOUCH2
TOUCH3
To CN24 on Main Board
YU
YL
XR
XL
RANGE +19.5V - +24.9 V
OPTIMAL VALUE AROUND +20.7V
5VC
5VC
5VC
5VC
+12V
-12V
+12V -12V
5VC
C4
100uF 16
C5
NIU
IC1
NJM2360M
FLAT
1
2
3
4 5
6
7
8
CS
ES
CT
GND INV
V+
SI
CD
D1
SFPB-56
1 2
TP
TP1
L1
RCH-875-151K
R1
220mOHM I
1W
C6
560pFs
5% np0
R6
18Ks
1%
R8
1Ks
1%
R5
180
1/4W
CN1
00621 6012100808
3
4
5
6
7
8
2
1
9
10
11
12
CN4
53014 -0310
3
2
1
C1
47uF35
Q5
2SA101 5GR
3
2 1
Q3
2SC1815GR
3
1 2
Q2
2SC1815GR
3
1 2
R9
5K6
R10
5K6
R17
5K6
R15
2K7
R12
2K7
R18
100K
R19
100K
C9
1nF
C10
1nF
R11
2K7
R13
0
CN6
B7B-PH-K- S
3
4
2
1
5
6
7
CN5
53014 -0310
3
2
1
IC2A
UPC4570C
2
3
1
-
IC2B
UPC4570C
6
5
7
C7
47uF35
C8
47uF35
IC2C
UPC4570C
8 4
CN2
53014 -1310
3
4
5
6
7
8
2
1
9
10
11
12
13
C3
47uF35
R2
1Ks
1%
C2
100uF50
Q1
2SC1815G R
3
1
2
CN7
52043 -0410
3
4
2
1
Q4
2SA1015GR
3
2 1
R16
5K6
R14
2K7
R21
2K2I
0.6W
R20
2K2I
0.6W
2
1
From CN27 on MAIN BOARD
From CN3 on FC-7 BOARD
To THERM. BOARD