Read Sharp R-2397G (serv.man2) Service Manual online
18
R-2297G
R-2397G
R-2397G
1
VREF
IN
Reference voltage input terminal.
A reference voltage applied to the A/D converter in the LSI. Connected to
A reference voltage applied to the A/D converter in the LSI. Connected to
GND.(0V)
2
IN7
IN
Temperature measurement input: MAGNETRON THERMISTOR.
By inputting DC voltage corresponding to the temperature detected by the
By inputting DC voltage corresponding to the temperature detected by the
thermistor, this input is converted into temperature by the A/D converter built into
the LSI.
the LSI.
3
IN6
IN
Temperature measurement input: EXHAUST THERMISTOR.
By inputting DC voltage corresponding to the temperature detected by the
By inputting DC voltage corresponding to the temperature detected by the
thermistor, this input is converted into temperature by the A/D converter built into
the LSI.
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
Temperature measurement input: INTAKE THERMISTOR.
By inputting DC voltage corresponding to the temperature detected by the
By inputting DC voltage corresponding to the temperature detected by the
thermistor, this input is converted into temperature by the A/D converter built into
the LSI.
the LSI.
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
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.
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
(Output -5V in cooking only, but apply high impedance to others to prevent
thermistor from electrolytic corrosion ocurrence.)
16
P41
OUT
Terminal not used.
17
P40
OUT
Oven lamp, Blower motor and Stirrer motor driving signal. (Square Wave-
form : 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 cir-
cuit.
the RY1 relay driving circuit and
relays(RY3,RY4,COOK RELAY) control cir-
cuit.
18-22
P37-P33
OUT
Terminal not used.
23
P32
OUT
Signal to sound buzzer.
This signal is to control the 2.5kHz
This signal is to control the 2.5kHz
continuous signal.
A: key touch sound.
B: Guydance sound.
C: Completion sound.
B: Guydance sound.
C: Completion sound.
DESCRIPTION OF LSI
LSI(IZA646DR)
The I/O signal of the LSI(IZA646DR) is detailed in the following table.
The I/O signal of the LSI(IZA646DR) is detailed in the following table.
Pin No.
Signal
I/O
Description
GND
-5V
48 sec.
OFF
ON
H
L
20 msec
During cooking
A
B
C
0.12 sec
2.4 sec
1.2 sec
1.2 sec
GND
-5V
T
200µsec.
200µsec.
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