Sharp R-4A56, Service Manual

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17
R-4A56
DESCRIPTION OF LSI
LSI(IZA430DR)
The I/O signal of the LSI(IZA430DR) is detailed in the following table.
Pin No. Signal I/O Description
1 D10 OUT Digit selection signal.
Refer to the touch control panel circuit about the relation between signals and digits.
Normally, one pulse is output in every synchronized signal period, and input to the grid
of the fluorescent display.
2 D11 OUT Segment data signals.
Refer to the touch control panel circuit for the relationship between signals and
indicators. Normally, one pulse is output in every synchronized signal period, and
input to the anode of the fluorescent display.
3 TG1 OUT Signal to sound buzzer.
A: key touch sound (0.12sec.).
B: Completion sound (2.4sec.).
4 Vdisp IN Anode (segment) of Fluorescent Display illumination voltage:-29V.
Vp voltage of power source circuit input.
5 R0
0
OUT Segment data signal.
Signal similar to D11.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R2
3
,R3
0
-R3
2
terminal
while one of G1 line keys on key matrix is touched.
6 R0
1
OUT Segment data signal.
Signal similar to D11.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R2
3
,R3
0
-R3
2
terminal
while one of G2 line keys on key matrix is touched.
7 R0
2
OUT Segment data signal.
Signal similar to D11.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R2
3
,R3
0
-R3
2
terminal
while one of G3 line keys on key matrix is touched.
8 R0
3
OUT Segment data signal.
Signal similar to D11.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R2
3
,R3
0
-R3
2
terminal
while one of G4 line keys on key matrix is touched.
9 R1
0
OUT Segment data signal.
Signal similar to D11.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R2
3
,R3
0
-R3
2
terminal
while one of G5 line keys on key matrix is touched.
10 R1
1
OUT Segment data signal.
Signal similar to D11.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R2
3
,R3
0
-R3
2
terminal
while one of G6 line keys on key matrix is touched.
11 R1
2
OUT Segment data signal.
Signal similar to D11.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R2
3
,R3
0
-R3
2
terminal
while one of G7 line keys on key matrix is touched.
12 R1
3
OUT Segment data signal.
Signal similar to D11.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R23,R30-R32 terminal
while one of G8 line keys on key matrix is touched.
13-15 R2
0
-R2
2
OUT Segment data signal.
Signal similar to D11.