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

Page 24

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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Contents Table of Contents 520LWBefore Servicing When the testing is completed Dont Touch Before ServicingMicrowave Measurement Procedure RequirementsLeakage test Sharp PLAZA, Mahwah Microwave Ovens520LK/R-520LW ForewordSpecification General InformationDescription Grounding InstructionsOven Diagram Touch Control PanelPower Level P-0 to P-90 Cooking OperationDescription of Operating Sequence OFF ConditionSensor Cooking Condition MicrowaveSchematic Clock Appears on DisplayDescription and Function of Components Troubleshooting Guide Test Procedures Test ProcedureProblem Procedure Component Test Letter Magnetron Assembly TestProcedure Component Test Letter Microwave Output PowerPower Transformer Test Procedure Component Test Letter High Voltage Rectifier Test Cavity Temperature Fuse TestMagnetron Temperature Fuse Test High Voltage Capacitor TestReplace Temperature Fuse Primary Interlock Switch TestRun the oven and check all functions Secondary Interlock System TestProcedure Component Test Letter Monitor Switch Test Touch Control Panel Assembly TestFigure of all digits flicker KEY Unit TestRelay Test Compu Defrost TestMenu 1ST Stage 2ND Stage 3RD Stage STEAKS/CHOPS Level Time Primary on the PWB, this foil pattern acts as a fuse Steps Occurrence Cause or CorrectionTesting Method for AH Sensor AND/OR Control Unit AH Sensor TestChecking the initial sensor cooking condition Checking Control Unit R1, R2 22Ω ± 1% 1/2W R3 4.3Ω ± 5% 1/4W R4 1MΩ ± 5% 1/4WSensor Dummy Resistor Circuit Reset Circuit Indicator CircuitPower Source Circuit Synchronizing Signal CircuitDescription of LSI LSISignal similar to ANI3 Internal clock oscillation frequency control input settingPower source voltage Key strobe signalConverter power source voltage GND0V Converter power source voltageCommon data signal Absolute Humidity Sensor Circuit Structure of Absolute Humidity SensorOperational Principle of Absolute Humidity Sensor Detector Circuit of Absolute Humidity Sensor CircuitOther Precautions Touch Control Panel ServicingServicing of Touch Control Panel Servicing ToolsComponent Replacement and Adjustment Procedure Outer Case RemovalTo prevent an electric shock, take the following pre Power Transformer Removal Re-installHigh Voltage Rectifier and High Voltage Capacitor Removal Magnetron RemovalPositive Lock Connector NO-CASE Type Removal Control Panel Assembly RemovalGraphic Sheet and Membrane Switch Replacement Oven Lamp and Lamp Socket RemovalInstallation Turntable Motor RemovalInstallation Cooling FAN Motor RemovalRemoval Rear ViewDoor Replacement After adjustment, check the followingRE-INSTALL After any service, make sure of the followingSealer Film Diagram High Voltage ComponentsCircuit Control Unit Figure S-5 . Printed Wiring Board of Power Unit Parts List HOW to Order Replacement Parts MiscellaneousSCREWS,NUTS and Washers Model NumberOven and Cabinet Parts Control Panel Parts Door Parts Miscellaneous Packing and Accessories Copyright 2006 by Sharp Corporation ALL Rights Reserved

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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Cleaning and maintaining the R-520LW and R-520LK is a breeze, thanks to their easy-to-wipe surfaces and the interior's cavity that can be easily accessed. The durable construction of these microwaves means they are designed to withstand the rigors of daily use.

In summary, the Sharp R-520LW and R-520LK microwave ovens stand out with their advanced features, such as inverter technology and pre-programmed cooking settings, making them excellent choices for anyone looking to streamline their kitchen tasks. Their stylish designs and user-friendly interfaces further enhance their appeal, making them valuable additions to any modern home.
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