Read Sharp R-22AMM (serv.man8) Service Manual online
R22AMM
8 – 3
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
-
Terminal not used.
34
P26
IN
Signal coming from switch unit.
When either one of G-1 line switches on switch matrix is touched, a corresponding signal out of P30 - P31 will be
input into P26. When no switch is touched, the signal is held at “L” level.
When either one of G-1 line switches on switch matrix is touched, a corresponding signal out of P30 - P31 will be
input into P26. When no switch is touched, the signal is held at “L” level.
35
P25
IN
Signal similar to P26.
When either one of G-2 line switches on switch matrix is touched, a corresponding signal will be input into P25.
When either one of G-2 line switches on switch matrix is touched, a corresponding signal will be input into P25.
36
P24
IN
Signal similar to P26.
When either one of G-3 lines witches on switch matrix is touched, a corresponding signal will be input into P24.
When either one of G-3 lines witches on switch matrix is touched, a corresponding signal will be input into P24.
37-40
P23-P20
OUT
Segment data signal.
The relation between signals and indicators are as follows:
Signa Segment Signal Segment Signal Segment
P01 -------------- k P21 -------------- h P15 -------------- d
P02 -------------- j P20 -------------- g P14 -------------- c
P03 -------------- i P17 -------------- f P13 -------------- b
P23 ------------ LB P16 -------------- e P12 -------------- a
P22 ------------ UB
The relation between signals and indicators are as follows:
Signa Segment Signal Segment Signal Segment
P01 -------------- k P21 -------------- h P15 -------------- d
P02 -------------- j P20 -------------- g P14 -------------- c
P03 -------------- i P17 -------------- f P13 -------------- b
P23 ------------ LB P16 -------------- e P12 -------------- a
P22 ------------ UB
41-46
P17-P12
OUT
Segment data signal.
Signal similar to P23.
Signal similar to P23.
47-48
P11-P10
OUT
Digit selection signal.
The relation between digit signal and digit are as follows
Digit signal Digit
P11 .................... 1st.
P10 ................... 2nd.
P07 .................... 3rd
P06 .................... 4th.
P05 .................... 5th.
P04 .................... 6th.
The relation between digit signal and digit are as follows
Digit signal Digit
P11 .................... 1st.
P10 ................... 2nd.
P07 .................... 3rd
P06 .................... 4th.
P05 .................... 5th.
P04 .................... 6th.
Normally, one pulse is output in every
period, and input to
the grid of the Fluorescent Display.
49-52
P07-P04
OUT
Digit selection signal.
Signal similar to P11
Signal similar to P11
53-55
P03-P01
OUT
Segment data signal.
Signal similar to P23.
Signal similar to P23.
56
P00
-
Terminal not used.
57-58
P37-P36
OUT
(Sound) Voltage level control terminal.
This terminal (P37) is to control volume level of buzzer sound with terminals P36. Since the volume level of buzzer
sound depends on voltage energized, it is control level in 3 steps by combining signal levels for P37 and P36.
Relationship of signal level combination to sound volume level is shown in the following table, 1~3 in the table,
however, are indicated in the descending order from the maximum level of sound volume through the minimum
level.
This terminal (P37) is to control volume level of buzzer sound with terminals P36. Since the volume level of buzzer
sound depends on voltage energized, it is control level in 3 steps by combining signal levels for P37 and P36.
Relationship of signal level combination to sound volume level is shown in the following table, 1~3 in the table,
however, are indicated in the descending order from the maximum level of sound volume through the minimum
level.
*At Output terminal P47, rectangular wave signal of 2.5kHz is output.
59
P35
-
Terminal not used.
60
P34
OUT
Terminal not used.
61
P33
OUT
Terminal not used.
62
P32
OUT
Terminal not used.
63
P31
OUT
Switch strobe signal.
Signal applied to switch unit section. A pulse signal is input to P24 - P26 terminals while one of G-4 line switches
on switch matrix is touched.
Signal applied to switch unit section. A pulse signal is input to P24 - P26 terminals while one of G-4 line switches
on switch matrix is touched.
64
P30
OUT
Switch strobe signal.
Signal applied to switch unit section. A pulse signal is input to P24 - P26 terminals while one of G-5 line switches
on switch matrix is touched.
Signal applied to switch unit section. A pulse signal is input to P24 - P26 terminals while one of G-5 line switches
on switch matrix is touched.
Pin No.
Signal
I/O
Description
GND
-31(V)
ß
(50Hz)
H
L
GND
ß
(50Hz)
ß
P11
P10
P07
P06
P05
P04
GND
-31(V)
-31(V)
A
A : 1,(Max) 20V
2,
13V
3,(Min)
7V
Sound Volume P36
P37
1, (Max.)
L
L
2,
H
L
3, (Min.)
L
H
Click on the first or last page to see other R-22AMM (serv.man8) service manuals if exist.