Sharp R-530EK service manual Operation, Description of Operating Sequence

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R - 5 3 0 E K

R - 530EW

OPERATION

DESCRIPTION OF OPERATING SEQUENCE

The following is a description of component functions during oven operation.

OFF CONDITION

Closing the door activates the door sensing switch and secondary interlock switch. (In this condition, the monitor switch contacts are opened.)

When oven is plugged in, 120 volts A.C. is supplied to the control unit. (Figure O-1).

1.The display will show "SHARP SIMPLY THE BEST PRESS CLEAR AND PRESS CLOCK".

To set any program or set the clock, you must first touch the STOP/CLEAR pad. The display will clear, and " : " will appear.

COOKING CONDITION

Program desired cooking time by touching the NUMBER pads. Program the power level by touching the POWER LEVEL pad.

When the START pad is touched, the following operations occur:

1.The contacts of relays are closed and components connected to the relays are turned on as follows.

(For details, refer to Figure O-2)

RELAY

CONNECTED COMPONENTS

RY-1

oven lamp/turntable motor/fan motor

 

 

RY-2

power transformer

 

 

2.120 volts A.C. is supplied to the primary winding of the power transformer and is converted to about 3.2 volts A.C. output on the filament winding, and approximately 2360 volts A.C. on the high voltage winding.

3.The filament winding voltage heats the magnetron filament and the H.V. winding voltage is sent to a voltage doubler circuit.

4.The microwave energy produced by the magnetron is channelled through the waveguide into the cavity feed- box, and then into the cavity where the food is placed to be cooked.

5.Upon completion of the cooking time, the power transformer, oven lamp, etc. are turned off, and the generation of microwave energy is stopped. The oven will revert to the OFF condition.

6.When the door is opened during a cook cycle, the monitor switch, door sensing switch, secondary interlock switch, relay (RY1) and primary interlock relay are activated with the following results. The circuits to the turntable motor, the cooling fan motor, and the high voltage components are de-energized, the oven lamp remains on, and the digital read-out displays the time still remaining in the cook cycle when the door was opened.

7.The monitor switch electrically monitors the operation of

the secondary interlock switch and primary interlock relay and is mechanically associated with the door so that it will function in the following sequence.

(1)When the door opens from the closed position, the primary interlock relay (RY2) and secondary interlock switch open their contacts. And contacts of the relay (RY1) remains closed. Then the monitor switch contacts close.

(2)When the door is closed from the open position, the monitor switch contacts open first. Then the contacts of the secondary interlock switch and door sensing switch close. And contacts of the relay (RY1) open.

If the secondary interlock switch and primary interlock relay (RY2) fail with the contacts closed when the door is opened, the closing of the monitor switch contacts will form a short circuit through the monitor fuse, secondary interlock switch, relay (RY1) and primary interlock relay (RY2), causing the monitor fuse to blow.

POWER LEVEL 0% TO 100% COOKING

When Variable Cooking Power is programmed, the 120 volts A.C. is supplied to the power transformer intermittently through the contacts of relay (RY-2) which is operated by the control unit within a 32 second time base. Microwave power operation is as follows:

VARI-MODE

ON TIME

OFF TIME

100% power

32 sec.

0 sec.

 

 

 

approx. 90% power

30 sec.

2 sec.

approx. 80% power

26 sec.

6 sec.

approx. 70% power

24 sec.

8 sec.

approx. 60% power

22 sec.

10 sec.

 

 

 

approx. 50% power

18 sec.

14 sec.

 

 

 

approx. 40% power

16 sec.

16 sec.

approx. 30% power

12 sec.

20 sec.

approx. 20% power

8 sec.

24 sec.

approx. 10% power

6 sec.

26 sec.

 

 

 

0% power

0 sec.

32 sec.

Note: The ON/OFF time ratio does not correspond with the percentage of microwave power, because approx. 2 seconds are needed for heating of the magnetron filament.

SENSOR COOKING CONDITION

Using the SENSOR function, the food is cooked without figuring time, power level or quantity. When the oven senses enough steam from the food, it relays the information to its microprocessor which will calculate the remaining cooking time and power level needed for best results. When the food is cooked, water vapor is developed. The sensor “senses” the vapor and its resistance increases gradually. When the resistance reaches the value set according to the menu, supplementary cooking is started.

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Contents Table of Contents Models R 5 3 0 E K R-530EWBefore Servicing When the testing is completed Dont Touch Before ServicingLeakage test Microwave Measurement ProcedureRequirements Sharp PLAZA, Mahwah Microwave Oven530EK/ R-530EW ForewordSpecification General InformationDescription Grounding InstructionsOven Diagram Touch Control PanelOperation Description of Operating SequenceMicrowave Cooking SequenceFigure O-1. Oven Schematic-Off Condition Description and Function of Components Troubleshooting Guide CK = Check / RE = Replace Test Procedures Procedure Letter Component Test Magnetron Assembly TestMicrowave Output Power Power Transformer TestProcedure Letter Component Test Cavity Temperature Fuse TestMagnetron Temperature Fuse Test High Voltage Rectifier TestSecondary Interlock Switch Test Door Sensing SwitchMonitor Switch Test Primary Interlock System TestBlown Monitor Fuse Test Touch Control Panel Assembly TestBefore testing KEY Unit Test Relay Test Compu Defrost TestProcedure Component Test Letter Foil Pattern on the Printed Wiring Board TestTesting Method for AH Sensor AND/OR Control Unit AH Sensor TestChecking the initial sensor cooking condition Water load cooking testChecking Control Unit Sensor Dummy Resistor CircuitTouch Control Panel Assembly LSIIXA098DR Pin No Signal Description Signal synchronized with commercial power source frequencyKey strobe signal Signal coming from touch keyPower source voltage GND0V Internal clock oscillation frequency control input settingCommon data signal COM8 Common data signal COM7Common data signal COM9 Common data signal COM10Absolute Humidity Sensor Circuit Structure of Absolute Humidity SensorTouch Control Panel Servicing KRC243MComponent Replacement and Adjustment Procedure Outer Case RemovalPower Transformer Removal ReinstallationHigh Voltage Rectifier and High Voltage Capacitor Removal Magnetron RemovalPositive Lock Connector NO-CASE Type Removal Control Panel Assembly RemovalOven Lamp and Lamp Socket Removal Turntable Motor RemovalAH Sensor Replacement InstallationCooling FAN Motor Removal RemovalRemoval Door ReplacementAfter adjustment, check the following Reinstallation After any service, make sure of the followingInstallation Sealer FilmFigure S-1. Pictorial Diagram High Voltage ComponentsFigure S-2. Power Unit Circuit Circuit OFF CookZD1 SP1 VRBRY2 RY1 RY3 TTMParts List Electric PartsCabinet Parts Control Panel PartsHOW to Order Replacement Parts Door PartsMiscellaneous SCREWS,NUTS and WashersOven and Cabinet Parts Control Panel Parts Door Parts Miscellaneous Packing and Accessories Copyright 2001 by Sharp Corporation ALL Rights Reserved

R-530EK specifications

The Sharp R-530EK is a notable microwave oven that combines functionality with innovation to enhance cooking convenience. With a sleek design and user-friendly interface, this model has earned a place in many kitchens around the globe.

One of the primary features of the Sharp R-530EK is its powerful microwave output. The oven boasts a maximum power of 900 watts, ensuring that food can be heated quickly and evenly. This power level allows users to prepare a variety of meals, from reheating leftovers to cooking dishes from scratch, in significantly less time than traditional cooking methods.

The R-530EK is equipped with a spacious interior, offering 25 liters of capacity. This ample space allows for cooking larger dishes or multiple servings at once. The turntable design ensures even cooking by rotating food during the heating process, further enhancing the microwave's efficiency.

Another standout feature of the Sharp R-530EK is its array of pre-programmed auto-cook menus. These presets simplify cooking by providing specific times and power levels for various types of food, including popcorn, pizzas, and oatmeal. Users can simply select the appropriate setting, and the microwave takes care of the rest, making it ideal for those who may not have extensive cooking experience.

The microwave utilizes advanced inverter technology, a feature that sets it apart from many conventional microwave ovens. Inverter technology allows for continuous and consistent power output, providing more precise temperature control. This means that delicate foods such as seafood or chocolate can be heated without the risk of overcooking or burning, resulting in better texture and flavor.

Additionally, the R-530EK is designed with multiple cooking functions that enhance its versatility. These include defrosting capabilities, grilling options, and even signals indicating the completion of cooking cycles. The easy-to-read digital display and intuitively designed buttons contribute to the overall user experience, making it accessible for individuals of all ages.

Moreover, this microwave oven ensures safety with features such as a child lock, which prevents accidental operation by little hands. The Sharp R-530EK is both an efficient and reliable addition to any kitchen, embodying the perfect blend of cutting-edge technology and practical design to meet the demands of modern cooking. With its impressive range of features and performance capabilities, it stands as a valuable tool for aspiring chefs and busy families alike.
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