Sharp R-4H55 Service Manual page 24

Pin No.
Signal
Description
Used for initial balancing of the bridge circuit (WEIGHT SENSOR).(R4X55,R4X556)
l/O
OUT
22-23
C5-C6
24
c7 OUT
Oven lame drivina sianal. (Sauare Waveform : 50Hz)
To turn on and off the shut-off relay(RY1).
zonlsec
The square waveform voltage is delivered
H
to the relay (RYl) driving circuit and relay
-ll-u-u-l -ll-uu-T
L
(RY2 ) control circuit.
O""ng caC,ng
25
HO
IN Sianal comina from touch kev.
When any one of G-l 2 line keys on key matrix is touched, a corresponding signal
from B2,83,85,86,87,GO and Gl will be input onto HO. When no key is touched, the
signal is held at 'I" level.
26
HI IN Sianal similar to HO.
When any one of G-l 1 line keys on key matrix is touched, a corresponding signal
will be input into Hl.
27 H2
IN Sianal similar to HO.
When any one of G-l 0 line keys on key matrix is touched, a corresponding signal
will be input into H2.
28 H3
IN Sianal similar to HO.
When any one of G-9 line keys on key matrix is touched, a corresponding signal will
be input into H3.
29
H4
H5-H7
VPP
OUT
OUT
IN
Diait selection sianal.
The relation between digit signal and digit are as follows;
Digit signal Digit
H
H4 ________________________________ 1 St.
S(so"Z)
I.
H5 ________________________________ 2nd.
____------_-____ GND
H6
________________________________ 3rd.
vp
H7 ________________________________ 4th.
FO _____ ____________________________ 5th.
BO,Bl ____________________________ 6th.
Normally, one pulse is output in every 6
period, and input to the grid of the Fluo-
rescent Display.
FO n
81,En
I----- GND
VP
30-32
Diait selection sianal.
Signal similar to H4.
33
34
Anode
(Seament)
of Fluorescent DisDlav liaht-uD voltaae: -25V
Vp voltage
of power source circuit input.
FO
35-36
BO-Bl
OUT
OUT
OUT
c
Diait selection sianal.
Signal similar to H4.
Diait selection sianal.
Signal similar to H4.
Seament data sianals.
The relationship between signals and indicators are as follows:
Signal Segment Signal
Segment
62
_______________ LB
GO _______________ f
G6
_______________ UB
B7 _______________ e
G5 _-____-________ k
B(j
_______________ d
W-W
G4
_______________
j B5 _______________ c
G3
_______________ i B4 _-_____________ b
G2
______-________ h
'rul':: +
B3 _______________ a
Gl _______________ g
Kev strobe sianal.
Signal applied
to
touch-key section. A pulse signal is input to HO - H3 terminal while
one of G-l line keys on kev matrix is touched.
22
37
B2