Sharp R-8380 Service Manual page 27

8380
Pin No.
40
41
42 P14
43
44
45
PI2
PI 1
46 PI0
/
Signal
P16
PI5
P13
OUT
?
!
i
/
7
T
j
~
I
t
I
+
,
I
I
1
i
I
47
I
PO7
/
+-
PO6
PO5
I/O
f
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
/
i
1) Segment data signal.
Signal similar to Pl7.
2) Key strobe signal.
Signal applied to touch-key section.
A pulse signal is input to RO -R3 terminal while one of G-6 line keys on key matrix
is touched.
1) Segment data signal.
-~ -~~ ..-_
Signal similar to P17.
2) Key strobe signal.
Signal applied to touch-key section.
A pulse signal is input to RO-R3 terminal while one of G- 7 line keys on key matrix
Description
Digit selection signal.
The relation between digit signal and digit are as follows:
Digit signal
digit Digit signal
digit
PI6 . . .lst
PO4 . . . .4th
P13 . . . . . . .2nd
PO0 . . . . . . .5th
PO7 . . . . .3rd P25 . . . . . . . . . . . . . . .6th
Normally, one pulse is output in every fL period, and input to the grid of the Fluorescent
Display.
--
" 150HZl 1 r--K;-;
-_------- ------- GNcl
Segment data signal.
Signal similar to P17.
Digit selection signal.
Signal similar to P16.
Segment data signal.
Signal similar to PI 7.
1) Segment data signal.
,+ Signal similar to P17.
2) Key strobe signal.
Signal applied to touch-key section.
Apulse signal is input to R6 - R3 terminal while one of G-5 line keys on key matrix
is touched.
Digit selection signal.
Signal similar to P16.
1
IS touched.
1
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