Sharp R-1880LS, Руководство по обслуживанию

Страница: 36 / 60

36
R-1880LS/LST
Output to control oscillation input of XIN.
3 VSS IN
Power source voltage:-5V.
VC voltage of power source circuit input.
33 P7 IN
Signal coming from touch key.
When any one of G1 line keys on key matrix is touched, a corresponding signal will be input
into P7. When no key is touched, the signal is held at "L" level.
34 P6 IN
Signal similar to AN1.
When any one of G11 line keys on key matrix is touched, a corresponding signal will be input
into P6.
35 P5 IN
Signal similar to P27.
When any one of G10 line keys on key matrix is touched, a corresponding signal will be input
into P5.
36 P4 IN
Signal similar to P27.
When any one of G9 line keys on key matrix is touched, a corresponding signal will be input
into P4.
37-40 P3-P0 OUT
Digit selection signal.
The relationship between digit signal and digit are as fol-
lows;
Digit signal Digit Digit signal Digit
P14 ................................. 1st. P0 ................................5th.
P15 ................................nd. P1 ................................6th.
P16 ................................ 3rd. P ................................7th.
P17 .................................4th. P3 ................................8th.
(ß : INTO signal)
Refer to the touch control panel circuit about the relation
between signals and digits. Normally, one pulse is output
in every synchronized signal (ß) period, and input to the grid
of the fluorescent display.
41-44 P17-P14 OUT
Digit selection signal.
Signal similar to P3.
45-48 P13-P10 OUT
Segment data signal.
Signal similar to P55.
49 P07 OUT
Segment data signal.
Signal similar to P55.
50 P06 OUT
Segment data signal.
Signal similar to P55.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AN1 and P7 - P4 terminal
while one of G7 line keys on key matrix is touched.
51 P05 OUT
Segment data signal.
Signal similar to P55.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AN1 and P7 - P4 terminal
while one of G6 line keys on key matrix is touched.
5 P04 OUT
Segment data signal.
Signal similar to P55.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AN1 and P7 - P4 terminal
while one of G5 line keys on key matrix is touched.
53 P03 OUT
Segment data signal.
Signal similar to P55.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AN1 and P7 - P4 terminal
while one of G4 line keys on key matrix is touched.
54 P0 OUT Segment data signal. Signal similar to P55.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AN1 and P7 - P4 terminal
while one of G3 line keys on key matrix is touched.
55 P01 OUT
Segment data signal.
Signal similar to P55.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AN1 and P7 - P4 terminal
Pin No. Signal I/O Description
H
L
GND
VP
§(60Hz)
P14
P15
P16
P17
P20
P21
P22
P23