Sharp R-501FK Service Manual page 21

LSI
The I/O signal of the LSI is detailed in the following table.
Pin No. Signal I/O
1-2 VL2-VL1 IN
3-6 AN7-AN4 IN
7 P63 OUT
8 AN2 IN
9 AN1 IN
10 AN0 IN
11 P57 OUT
12-13 P56-P55 OUT
14 CNTR0 OUT
15 P53 OUT
16 P52 OUT
17-18 P51-P50 OUT
19 P47 IN
20 P46 OUT
21 P45 IN
22-23 P44-P43 IN
24 INT0 IN
25 P41 IN
26 P40 IN
DESCRIPTION OF LSI
Power source voltage input terminal.
Standard voltage for LCD.
Terminal to change cooking input according to the Model.
By using the A/D converter contained in the LSI, DC voltage in accordance with the
Model in operation is applied to set up its cooking constant.
Terminal not used.
Input terminal to judge the model.
The one of signals P20 - P27 will be input into AN2 through one of G1 - G8 lines on
key matrix. The LSI will judge the model by this signal.
To input signal which communicates the door open/close information to LSI.
Door close "H" level signal (0V). Door open "L" level signal (-5V).
Input terminal to judge the model.
Connected to GND through the pull-down resistor.
Back light circuit (Light emitting diodes) driving signal.
Terminal not used.
Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
Oven lamp, fan motor and turntable motor driving signal
To turn on and off shut off relay (RY1). The
square waveform voltage is delivered to the
RY1 driving circuit and RY2 control circuit.
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2).
The signals holds "L" level during
microwave cooking and "H" level while
not cooking. In other cooking modes
(variable cooking) the signal turns to "H"
level and "L" level in repetition according
to the power level.
Terminal not used.
Signal coming from touch key.
When either G12 line on key matrix is touched, a corresponding signal out of P20 -
P27 will be input into P47. When no key is touched, the signal is held at "H" level.
Terminal not used.
Signal similar to P47.
When either G11 line on key matrix is touched, a corresponding signal will be input
into P45.
Terminal not used.
Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
Signal similar to P47.
When either G10 line on key matrix is touched, a corresponding signal will be input
into P41.
Connected to GND through the pull-down resistor R90.
19
Description
0.1 sec.
A
2.0 sec.
B
16.7 msec.
During cooking
OFF
Maximum
output
OFF
70% of maximum
output
16.7 msec.
R-501FK
R-501FW
H : GND
L : -5V
H : GND
L : -5V
H : GND
L : -5V
H : GND
ON
L : -5V
OFF
H : GND
24 sec.
8 sec.
ON
L : -5V
H : GND
L : -5V