Read Sharp R-2397G (serv.man2) Service Manual online
19
R-2297G
R-2397G
R-2397G
24
P31
IN
Signal synchronized with commercial power source frequency.
This is basic timing for all time processing of LSI.
This is basic timing for all time processing of LSI.
25
P30
OUT
Terminal not used.
26
CNVSS
IN
Connected to Vc.(-5V)
27
RESET
IN
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is supplied.
Temporarily set to "L" level the moment power is supplied, 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 supplied.
Temporarily set to "L" level the moment power is supplied, at this time the LSI is
reset. Thereafter set at "H" level.
28
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.
29
XOUT
OUT
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
Output to control oscillation input of XIN.
30/31
XCIN/XCOUT
IN/OUT
Terminal not used.
32
VSS
IN
Power source voltage: -5V.
VC voltage of power source circuit input.
VC voltage of power source circuit input.
33
ø
OUT
Terminal not used.
34
R3
IN
Signal coming from touch key.
When either one of G-12 line keys on key matrix is touched, a corresponding signal
out of P11, P12, P14-P17 will be input into R3. When no key is touched, the signal
is held at "L" level.
When either one of G-12 line keys on key matrix is touched, a corresponding signal
out of P11, P12, P14-P17 will be input into R3. When no key is touched, the signal
is held at "L" level.
35
R2
IN
Signal similar to R3.
When either one of G-11 line keys on key matrix is touched, a corresponding signal
will be input into R2.
When either one of G-11 line keys on key matrix is touched, a corresponding signal
will be input into R2.
36
R1
IN
Signal similar to R3.
When either one of G-10 line keys on key matrix is touched, a corresponding signal
will be input into R1.
When either one of G-10 line keys on key matrix is touched, a corresponding signal
will be input into R1.
37
R0
IN
Signal similar to R3.
When either one of G-9 line keys on key matrix is touched, a corresponding signal
will be input into R0.
When either one of G-9 line keys on key matrix is touched, a corresponding signal
will be input into R0.
38
VP
IN
Anode (segment) of Fluorescent Display light-up voltage: -31V
Vp voltage of power source circuit input.
Vp voltage of power source circuit input.
39
P17
OUT
Segment data signal.
The relation between signals and indicators are as follows:
The relation between signals and indicators are as follows:
Signal
Segment
Signal
Segment
P24 ................... i
P13 ..................... f
P23 ................ j,k
P12 .................... e
P17 ............... LB
P11 .................... d
P16 ............... UB
P10 .................... c
P15 .................. h
P07 .................... b
P14 .................. g
P06 .................... a
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R0-R3 terminal while
one of G-6 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to R0-R3 terminal while
one of G-6 line keys on key matrix is touched.
40
P16
OUT
Segment data signal.
Signal similar to P17.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R0-R3 terminal while
one of G-5 line keys on key matrix is touched.
Signal similar to P17.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R0-R3 terminal while
one of G-5 line keys on key matrix is touched.
41
P15
OUT
Segment data signal.
Signal similar to P17.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R0-R3 terminal while
one of G-4 line keys on key matrix is touched.
Signal similar to P17.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R0-R3 terminal while
one of G-4 line keys on key matrix is touched.
Pin No.
Signal
I/O
Description
H : GND
L (-5V)
20 msec
GND
-31(V)
ß(50Hz)
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