Sharp R-23AM (serv.man3) Service Manual ▷ View online
19
R - 2 2 A T
R-23AM
R - 2 4 A T
R-23AM
R - 2 4 A T
Pin No.
Signal
I/O
Description
2
IN7
IN
Temperature measurement input: MAGNETRON THERMISTOR AND OVEN
THERMISTOR (2).
By inputting DC voltage corresponding to the temperature detected by the thermis-
tor, this input is converted into temperature by the A/D converter built into the LSI.
THERMISTOR (2).
By inputting DC voltage corresponding to the temperature detected by the thermis-
tor, this input is converted into temperature by the A/D converter built into the LSI.
3
IN6
IN
Temperature measurement input: OVEN THERMISTOR (1).
By inputting DC voltage corresponding to the temperature detected by the thermis-
tor, this input is converted into temperature by the A/D converter built into the LSI.
By inputting DC voltage corresponding to the temperature detected by the thermis-
tor, this input is converted into temperature by the A/D converter built into the LSI.
4
IN5
IN
A/D input for troubleshooting Magnetron 1.
5
IN4
IN
Terminal to change functions according to the model.
Signal in accordance with the model in operation is applied to set up its function.
Signal in accordance with the model in operation is applied to set up its function.
6
IN3
IN
A/D input for troubleshooting Magnetron 2.
7
IN2
IN
Connected to GND.(0V)
8
IN1
IN
Terminal not used.
9
IN0
IN
Connected to VC.
10
P47
OUT
Terminal not used.
11
P46
OUT
Memory (EEPROM) clock output.
12
P45
IN/OUT
Memory (EEPROM) data input/output.
13-14
P44-P43
OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay. In 100% power level operation, "L" level during
cooking; "H" level otherwise. In other power level operation (90, 80, 70, 60, 50, 40,
30, 20, 10 or 0%), "H" and "L" level is repeated according to power level.
To turn on and off the cook relay. In 100% power level operation, "L" level during
cooking; "H" level otherwise. In other power level operation (90, 80, 70, 60, 50, 40,
30, 20, 10 or 0%), "H" and "L" level is repeated according to power level.
Power level
ON
OFF
Power level
ON
OFF
100%
48sec. 0sec.
40%
22sec.
26sec.
90%
44sec. 4sec.
30%
16sec.
32sec.
80%
40sec. 8sec.
20%
12sec.
36sec.
70%
36sec. 12sec.
10%
8sec.
40sec.
60%
32sec. 16sec.
0%
0sec.
48sec.
50%
26sec. 22sec.
15
P42
OUT
Power supply output at thermistor detecting circuit.
(Output -5V in cooking only, but apply high impedance to others to prevent thermistor
from electrolytic corrosion occurrence.)
(Output -5V in cooking only, but apply high impedance to others to prevent thermistor
from electrolytic corrosion occurrence.)
16
P41
OUT
Terminal not used.
17
P40
OUT
Oven lamp, Blower motor and Stirrer motors driving signal. (Square Waveform
: 50Hz)
To turn on and off the shut-off relay (RY1).
The Square waveform voltage is delivered to
the RY1 relay driving circuit and relays(RY3,
RY4, COOK RELAY) control circuit.
: 50Hz)
To turn on and off the shut-off relay (RY1).
The Square waveform voltage is delivered to
the RY1 relay driving circuit and relays(RY3,
RY4, COOK RELAY) control circuit.
18-22
P37-P33
OUT
Terminal not used.
23
P32
OUT
Signal to sound buzzer.
This signal is to control the 2.5kHz
continuous signal.
continuous signal.
A: key touch sound.
B: Guidance sound.
C: Completion sound.
24
P31
IN
Signal synchronized with commercial power source frequency.
This is basic timing for all time processing of LSI.
GND
-5V
48 sec.
OFF
ON
H
L
20 msec
During cooking
H : GND
L (-5V)
20 msec
A
B
C
0.12 sec
2.4 sec
1.2 sec
1.2 sec
GND
-5V
T
200
µ
sec.
200
µ
sec.
20
R - 2 2 A T
R-23AM
R - 2 4 A T
R-23AM
R - 2 4 A T
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 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 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.
42-43
P14-P13
OUT
Segment data signal.
Signal similar to P17.
44
P12
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-8 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-8 line keys on key matrix is touched.
GND
-31(V)
ß(50Hz)
Pin No.
Signal
I/O
Description
21
R - 2 2 A T
R-23AM
R - 2 4 A T
R-23AM
R - 2 4 A T
45
P11
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-7 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-7 line keys on key matrix is touched.
46
P10
OUT
Segment data signal.
Signal similar to P17.
47-48
P07-P06
OUT
Segment data signal.
Signal similar to P17.
49
P05
OUT
Digit selection signal.
The relation between digit signal and digit
are as follows:
The relation between digit signal and digit
are as follows:
Digit signal
Digit
P05 .................... 1st.
P04 ................... 2nd.
P03 .................... 3rd.
P02 .................... 4th.
P01 .................... 5th.
P00 .................... 6th.
P04 ................... 2nd.
P03 .................... 3rd.
P02 .................... 4th.
P01 .................... 5th.
P00 .................... 6th.
Normally, one pulse is output in every ß
period, and input to the grid of the Fluores-
cent Display.
period, and input to the grid of the Fluores-
cent Display.
50-54
P04-P00
OUT
Digit selection signal.
Signal similar to P16.
Signal similar to P16.
55-57
P27-P25
OUT
Terminal not used.
58-59
P24-P23
OUT
Segment data signal.
Signal similar to P17.
60
P22
OUT
(Sound) Voltage level control terminal.
This terminal (P22) is to control volume level of buzzer sound with terminals P21.
Since the volume level of buzzer sound depends on voltage energized, it is control
level in 3 steps by combining signal levels for P22, P21. 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 (P22) is to control volume level of buzzer sound with terminals P21.
Since the volume level of buzzer sound depends on voltage energized, it is control
level in 3 steps by combining signal levels for P22, P21. 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.
Sound Volume
P21
P22
1, (Max.)
L
L
2,
H
L
3, (Min.)
L
H
*At Output terminal P32, rectangular wave signal of 2.5kHz is output.
61
P21
OUT
Sound level control signal.
Refer to above signal P22.
Refer to above signal P22.
62
P20
IN
Input signal which communicates the door open/close information to LSI.
Door closed; "H" level signal(0V).
Door opened; "L" level signal(-31.0V).
Door opened; "L" level signal(-31.0V).
63/64
AVCC/VCC
IN
Connected to GND.
Pin No.
Signal
I/O
Description
H
L
GND
ß(50Hz)
P05
P04
P03
P02
P01
P00
GND
-31(V)
-31(V)
A
A : 1,(Max) 20V
2, 13V
3,(Min) 7V
2, 13V
3,(Min) 7V
DESCRIPTION OF LSI FOR R-23AM
LSI(IZA648DR)
The I/O signal of the LSI(IZA648DR) is detailed in the following table.
The I/O signal of the LSI(IZA648DR) is detailed in the following table.
Pin No.
Signal
I/O
Description
1
VCC
IN
Connected to GND.
2
VEE
IN
Anode (segment) of Fluorescent Display light-up voltage: -35V.
Vp voltage of power source circuit input.
Vp voltage of power source circuit input.
3
AVSS
IN
Reference voltage input terminal.
A reference voltage applied to the A/D converter in the LSI. Connected to DC. (-5V)
A reference voltage applied to the A/D converter in the LSI. Connected to DC. (-5V)
4
VREF
IN
Reference voltage input terminal.
A reference voltage applied to the A/D converter in the LSI. Connected to GND.
A reference voltage applied to the A/D converter in the LSI. Connected to GND.
22
R - 2 2 A T
R-23AM
R - 2 4 A T
R-23AM
R - 2 4 A T
Pin No.
Signal
I/O
Description
5-6
AN7-AN6
IN
Terminal to switch the specification.
7
AN5
IN
Connected to GND.
8
AN4
IN
A/D input for troubleshooting Magnetron 1.
9
AN3
IN
A/D input for troubleshooting Magnetron 2.
10
AN2
IN
Temperature measurement input: OVEN THERMISTOR (1).
By inputting DC voltage corresponding to the temperature detected by the thermis-
tor, this input is converted into temperature by the A/D converter built into the LSI.
By inputting DC voltage corresponding to the temperature detected by the thermis-
tor, this input is converted into temperature by the A/D converter built into the LSI.
11
AN1
IN
Temperature measurement input: MAGNETRON THERMISTOR AND OVEN
THERMISTOR (2).
By inputting DC voltage corresponding to the temperature detected by the thermis-
tor, this input is converted into temperature by the A/D converter built into the LSI.
THERMISTOR (2).
By inputting DC voltage corresponding to the temperature detected by the thermis-
tor, this input is converted into temperature by the A/D converter built into the LSI.
12
P60
IN
Input signal which communicates the door open/close information to LSI.
Door closed; "H" level signal (0V).
Door opened; "L" level signal (-5.0V).
Door closed; "H" level signal (0V).
Door opened; "L" level signal (-5.0V).
13
P55
OUT
Power supply output at thermistor detecting circuit.
(Output -5V in cooking only, but apply high impedance to others to prevent thermistor
from electrolytic corrosion ocurrence.)
(Output -5V in cooking only, but apply high impedance to others to prevent thermistor
from electrolytic corrosion ocurrence.)
14-16
P54-P52
OUT
Terminal not used.
17
P51
IN
Signal coming from switch unit.
When either one of switches SW2 and SW4 on the switch unit is pressed, a
corresponding signal out of P44 and P43 will be input into P51.
When either one of switches SW2 and SW4 on the switch unit is pressed, a
corresponding signal out of P44 and P43 will be input into P51.
18
P50
IN
Signal similar to P51.
When either one of switches SW1, SW3 and SW5 on the switch unit is pressed, a
corresponding signal out of P43, P44 and P45 will be input into P50.
When either one of switches SW1, SW3 and SW5 on the switch unit is pressed, a
corresponding signal out of P43, P44 and P45 will be input into P50.
19
P47
OUT
Signal to sound buzzer.
This signal is to control the 2.5kHz
continuous signal.
continuous signal.
A: Switch touch sound.
B: Completion sound.
B: Completion sound.
20
P46
OUT
Terminal not used.
21
P45
OUT
Switch strobe signal.
Signal is applied to the switch unit. A pulse signal is input to P50 terminal while switch
SW5 is pressed.
Signal is applied to the switch unit. A pulse signal is input to P50 terminal while switch
SW5 is pressed.
22
P44
OUT
Switch strobe signal.
Signal is applied to the switch unit. A pulse signal is input to P50 or P51 terminal while
switch SW3 or SW4 is pressed.
Signal is applied to the switch unit. A pulse signal is input to P50 or P51 terminal while
switch SW3 or SW4 is pressed.
23
P43
OUT
Switch strobe signal.
Signal is applied to the switch unit. A pulse signal is input to P50 or P51 terminal while
switch SW1 or SW2 is pressed.
Signal is applied to the switch unit. A pulse signal is input to P50 or P51 terminal while
switch SW1 or SW2 is pressed.
24
P42
IN
Signal coming from encoder.
When the encoder is turned, the contacts of encoder make pulse signals. And pulse
signals are input into P42.
When the encoder is turned, the contacts of encoder make pulse signals. And pulse
signals are input into P42.
25
INT1
IN
Signal coming from encoder.
Signal similar to R42. Pulse signals are input into INT1.
Signal similar to R42. Pulse signals are input into INT1.
26
INT0
IN
Signal synchronized with commercial power source frequency.
This is basic timing for all time processing of LSI.
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.
A
B
0.12 sec
1.2 sec
1.2 sec
GND
-5V
GND
-5V
32 sec.
OFF
ON
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