Read Sharp R-4G75M (serv.man3) Service Manual online
19
R-4G75(W)M
R-4G75(B)M
R-4G75(B)M
Pin No.
Signal
I/O
Description
27
RESET
IN
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied. Set to “L” level
the moment power is applied, at this time the LSI is reset. Thereafter set at “H” level.
Signal is input to reset the LSI to the initial state when power is applied. Set to “L” level
the moment power is applied, at this time the LSI is reset. Thereafter set at “H” level.
28/29
P71/P70
IN/OUT
Terminal not used.
30
XIN
IN
Internal clock oscillation frequency setting input.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XOUT terminal.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XOUT terminal.
31
XOUT
OUT
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
Output to control oscillation input of XIN.
32
VSS
IN
Power source voltage:-5V.
VC voltage of power source circuit input.
VC voltage of power source circuit input.
33
P27
IN
Signal coming from touch key.
When any one of G-12 line keys on key matrix is touched, a corresponding signal from
P14,P12,P10,P07,P06 and P05 will be input into P27. When no key is touched, the
signal is held at "L" level.
When any one of G-12 line keys on key matrix is touched, a corresponding signal from
P14,P12,P10,P07,P06 and P05 will be input into P27. When no key is touched, the
signal is held at "L" level.
34
P26
IN
Signal similar to P27.
When any one of G-11 line keys on key matrix is touched, a corresponding signal will
be input into P26.
When any one of G-11 line keys on key matrix is touched, a corresponding signal will
be input into P26.
35
P25
IN
Signal similar to P27.
When any one of G-10 line keys on key matrix is touched, a corresponding signal will
be input into P25.
When any one of G-10 line keys on key matrix is touched, a corresponding signal will
be input into P25.
36
P24
IN
Signal similar to P27.
When any one of G-9 line keys on key matrix is touched, a corresponding signal will
be input into P24.
When any one of G-9 line keys on key matrix is touched, a corresponding signal will
be input into P24.
37
P23
OUT
Segment data signals.
The relationship between signals and indicators are as follows:
Signal
The relationship between signals and indicators are as follows:
Signal
Segment
Signal
Segment
P23 ............... LB
P07 .................... f
P01 ............... UB
P10 .................... e
P02 .................. k
P11 .................... d
P03 ................... j
P12 .................... c
P04 ................... i
P13 .................... b
P05 .................. h
P14 .................... a
P06 .................. g
Refer to the touch control panel circuit for the relationship between signals and
indicators. Normally, one pulse is output in every synchronized signal (ß) period, and
input to the anode of the Fluorescent Display.
indicators. Normally, one pulse is output in every synchronized signal (ß) period, and
input to the anode of the Fluorescent Display.
38-43
P15-P22
OUT
Digit selection signal.
The relation between digit signal and digit are as follows:
Digit signal
The relation between digit signal and digit are as follows:
Digit signal
digi
P15 ........................................... 1st.
P16 .......................................... 2nd.
P17 ........................................... 3rd.
P20 ........................................... 4th.
P21 ........................................... 5th.
P22 ........................................... 6th.
P16 .......................................... 2nd.
P17 ........................................... 3rd.
P20 ........................................... 4th.
P21 ........................................... 5th.
P22 ........................................... 6th.
Normally, one pulse is output in every ß
period, and input to the Fluorescent Dis-
play.
period, and input to the Fluorescent Dis-
play.
44
R14
OUT
Segment data signal.
Signal similar to P23.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while
one of G-1 line keys on key matrix is touched.
Signal similar to P23.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while
one of G-1 line keys on key matrix is touched.
ß(50Hz)
GND
VP
H
L
GND
VP
ß(50Hz)
P15
P16
P17
P20
P21
P22
GND
VP
Click on the first or last page to see other R-4G75M (serv.man3) service manuals if exist.