R - 5 2 0 L K R-520LW

LSI

DESCRIPTION OF LSI

The I/O signal of the LSI is detailed in the following table.

Pin No.

Signal

I/O

Description

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1-2

VL2-VL1

IN

Power source voltage input terminal.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Standard voltage for LCD.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3-6

AN7-AN4

IN

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.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7

AN3

IN

Signal coming from touch key.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

When either G13 line on key matrix is touched, a corresponding signal out of P20 - P27

 

 

 

will be input into AN3. When no key is touched, the signal is held at “H” level.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8

AN2

IN

To input signal which communicates the door open/close information to LSI.

 

 

 

Door close "H" level signal (0V). Door Open "L" level (-5V).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9

AN1

IN

Terminal not used.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10

AN0

IN

Terminal not used.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11-13

P57-P55

OUT

Terminal not used.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

14

CNTR0

OUT

Signal to sound buzzer (2.0 kHz).

 

 

 

0.1 sec.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A: key touch sound.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H : GND

 

 

 

A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B: Completion sound.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L : -5V

 

 

 

 

 

 

 

 

.0 sec.

 

 

 

 

 

 

 

 

 

H : GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L : -5V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15

P53

OUT

Used for initial balancing of the bridge circuit (absolute humidity sensor).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

16

P52

OUT

Oven lamp, fan motor and turntable motor driving signal

 

 

 

 

 

 

To turn on and off shut off relay (RY1). The

 

 

 

 

16.7 msec.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

square waveform voltage is delivered to the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H : GND

 

 

 

RY1 driving circuit and RY2 control circuit.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L : -5V

 

 

 

 

 

 

 

 

 

 

 

 

 

During cooking

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

17

P51

OUT

Used for initial balancing of the bridge circuit (absolute humidity sensor).

 

18

P50

OUT Magnetron high-voltage circuit driving signal.

OFF

 

 

H : GND

 

 

 

To turn on and off the cook relay (RY2). The

Maximum

 

 

 

 

 

 

 

 

 

 

 

 

 

signals holds“L”level during microwave cook-

output

 

ON

 

L : -5V

 

 

 

ing and “H” level while not cooking. In other

 

 

 

 

 

 

 

 

OFF

 

OFF

H : GND

 

 

 

cooking modes (variable cooking) the signal

70% of maximum

4 sec.

 

 

 

 

 

 

 

 

 

turns to “H” level and “L” level in repetition

output

 

ON

8 sec.

L : -5V

 

 

 

according to the power level.

 

 

 

 

 

 

 

 

 

 

 

 

19

P47

IN

Signal similar to AN3.

 

 

 

When either G13 line on key matrix is touched, a corresponding signal will be input into

 

 

 

P46.

 

 

 

 

 

 

20

P46

OUT

Terminal not used.

 

 

 

 

 

 

21

P45

IN

Signal similar to AN3.

 

 

 

 

 

 

 

 

 

When either G12 line on key matrix is touched, a corresponding signal will be input into

 

 

 

P45.

 

 

 

 

 

 

22-23

P44-P43

OUT

Terminal not used.

 

 

 

 

 

 

24

INT0

IN

Signal synchronized with commercial power source frequency.

 

 

 

This is the basic timing for time processing of LSI.

 

 

 

 

 

H : GND

 

 

 

 

 

L : -5V

 

 

 

 

16.7 msec.

 

 

 

 

 

 

 

24

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Sharp R-520LW, R-520LK service manual Description of LSI, Lsi
Page 23 Page 25

R-520LK, R-520LW specifications

The Sharp R-520LW and R-520LK are innovative microwave ovens that combine advanced technology with user-friendly features to enhance cooking experiences. Designed with modern kitchens in mind, these models embody efficiency, precision, and versatility.

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