Sharp R-21JV-F Service Manual page 21

LSI
The I/O signal of the LSI is detailed in the following table.
Pin No. Signal
1 VCC
2/3 VEE/AVSS
4 VREF
5-6 AN7-AN6
7-8 AN5-AN4
9-10 AN3-AN2
11 AN1
12 AN0
13 P55 OUT
14-15 P54-P53 OUT
16-18 P52-P50
19 P47 OUT
20 P46 OUT
21 P45 OUT
DESCRIPTION OF LSI
I/O
IN Power source voltage: +5V.
VC voltage of power source circuit input.
IN Connected to GND
IN Connected to VC. (+5V)
IN Terminal not used.
IN Terminal to change functions according to the model.
Signal in accordance with the model in operation is applied to set up its function.
IN Terminal not used.
IN Input signal which communicates the door open/close information to LSI.
Door closed; "L" level signal (0V).
Door opened; "H" level signal (+5V).
IN Terminal not used.
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay. In 100% power level operation, "H" level during
cooking; "L" 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
100% 32sec.
90% 30sec.
80% 26sec.
70% 24sec.
60% 22sec. 10sec.
50% 18sec. 14sec.
Terminal not used.
IN Terminal not used.
Signal to sound buzzer.
This signal is to control the 2.5kHz
continuous signal through IC3.
A: key touch sound.
B: Guidance sound.
C: Completion sound.
Oven lamp, Fan motor and Antenna motor driving signal. (Square Waveform :
60Hz)
To turn on and off the shut-off relay (RY3). The
Square waveform voltage is delivered to the
RY3 driving circuit and relays(RY2, COOK
RELAY) control circuit.
Digit selection signal.
The relation between digit signal and digit are
as follows:
Digit signal
P42 ................. 1st.
P43 ................ 2nd.
P44 ................. 3rd.
P45 ................. 4th.
Normally, one pulse is output in every ß period,
and input to the grid of the light-emitting diode.
Description
OFF Power level ON OFF
0sec. 40% 16sec. 16sec.
2sec. 30% 12sec. 20sec.
6sec. 20% 8sec. 24sec.
8sec. 10% 6sec. 26sec.
0% 0sec. 32sec.
Digit
19
ON
OFF
32 sec.
0.1 sec
+5V
A
GND
1 sec 1 sec
+5V
200µsec.
B
GND
2 sec
+5V
C
GND
During cooking
16.7 msec
ß(60Hz)
P42
P43
P44
P45
R-21HT-F
R-21JV-F
+5V
GND
T
200µsec.
H
L
H
L
+5V
GND