Sharp R-930AW Test Procedures Component Test Letter, Thermal CUT-OUT Test, Heating Element Test

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R-930AK

R-930AW

TEST PROCEDURES

PROCEDURE

COMPONENT TEST

LETTER

 

 

An open temperature fuse indicates overheating of the magnetron assembly, check for restricted air flow

 

to the magnetron through the opening in the chassis, especially the cooling duct and cooling fan.

JTHERMAL CUT-OUT TEST

A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the temperature of thermal cut-out reaches 302˚F(150˚C). The thermal cut-out resets automatically at approximately 266˚F(130˚C). If the thermal cut-out has opened under the normal condition, replace the same item as in the parts list. An open thermal cut-out indicates overheating of heater unit.

Check for restricted air flow to the heater unit through the vent hole of the oven cavity, especially the heater duct and convection fan.

KHEATING ELEMENT TEST

Make sure the heating element is fully cooled and test as follows;

a.Disconnect wire leads and measure the resistance with an ohmmeter. On the R x 1 scale, the resistance between the heating element terminals should be approximately 10.2Ω.

b.Disconnect wire leads and measure the insulation resistance with 500V - 100MΩ insulation

resistance meter. The insulation resistance between heating element terminal and cavity should be more than 0.5MΩ.

LTHERMISTOR TEST

Disconnect connector-E from the control unit. Measure the resistance of the thermistor with an ohmmeter. Connect the ohmmeter leads to Pin No’s E-3 and E-4.

Room Temperature

Resistance

68˚F(20˚C) - 86˚F(30˚C)

Approx. 350kΩ - 155KΩ

 

 

If the meter does not indicate above resistance, replace the thermistor

MDAMPER MOTOR TEST

When the power cord is plugged into the wall receptacle and 120 volts A.C. is supplied to the damper motor, the motor operates until the damper is opened and the damper switch closes. Then the damper motor stops operation.

If the damper motor does not operate, check for A.C. voltage with a voltmeter at the motor.

1.Disconnect the power cord from the wall receptacle.

2.Disconnect the wire leads of motor and connect the meter leads to the wire leads of main wire harness.

3.Re-connect the power cord into the wall receptacle.

If 120 volts A.C. is indicated at the wire leads, replace the motor and if 120 volts A.C. is not indicated, check the wire harness and control unit.

NDAMPER SWITCH TEST

Disconnect the wire leads from the switch terminals and connect ohmmeter leads to the common (COM.) and normally open (N.O.) terminals of the switch.

1.When switch actuator is pushed by the damper motor cam, the meter should be indicated a closed circuit.

2.When power cord is plugged into the wall receptacle, the damper motor operates and damper cam will start to rotate. When the switch actuator is released, the meter should be indicated an open circuit. If improper operation is indicated, replace the damper switch.

OCHECKING TEMPERATURE IN THE CONVECTION MODE

It is difficult to measure the exact temperature in the convection oven. An accurate thermocouple type temperature tester must be used. A low priced bi-metal type thermometer is not reliable or accurate. The temperature should be checked with outer case cabinet installed, approx. 5 minutes after preheat

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Contents Table of Contents Convection Microwave Oven930AK 930AW Before Servicing Microwave Measurement Procedure RequirementsLeakage test 930AK / R-930AW Sharp PLAZA, MahwahConvection Microwave Oven ForewordDescription SpecificationGeneral Information Grounding InstructionsOven Diagram Touch Control PanelDescription of Operating Sequence Power Level P-0 to P-90 CookingOperation OFF ConditionSensor Cooking Condition Convection Cooking ConditionAutomatic MIX Cooking Condition Preheating ConditionCompu Defrost Cooking Fire Sensing Feature Microwave ModeCompu BROIL/ Compu ROAST/ Compu Bake Cooking SequenceSchematic Diagram Figure O-1. Oven Schematic-OFF ConditionFigure O-4. Oven Schematic-Convection Cooking Condition Description and Function of Components Convection Cooking System Troubleshooting GuideHeating Element Damper OPEN-CLOSE MechanismTest Procedure Problem Possible Cause Defective PartsPower Transformer Test Test ProceduresProcedure Component Test Letter Magnetron Assembly Test High Voltage Rectifier TestMonitor Switch Procedure Component Test LetterSecondary Interlock Switch Test Temperature Fuse TestChecking Temperature in the Convection Mode Test Procedures Component Test LetterDamper Switch Test Thermal CUT-OUT TestOuter Case Switch Test Touch Control Panel Assembly TestKEY Unit Test Weight 1ST Stage 2ND Stage 3RD Stage 4TH Stage Level Time Relay TestCompu Defrost Test Checking the initial sensor cooking condition Occurrence Cause or CorrectionAH Sensor Test Water load cooking testChecking Control Unit Test Procedures Letter Component TestTesting Method for AH Sensor AND/OR Control Unit R1,R2 22Ω ± R3 4.3kΩ ± 5% 1/4WTouch Control Panel Assembly ThermistorDescription of LSI LSIIZA797DRTOR Segment data signal Signal similar to P27Segment data signals Key strobe signalAbsolute Humidity Sensor Circuit Structure of Absolute Humidity SensorServicing Power Transformer Removal Component Replacement and Adjustment ProcedureOuter Case Switches Replacement Outer Case RemovalMagnetron Removal High Voltage Rectifier Assembly RemovalPositive Lock Connector NO-CASE Type Removal High Voltage Capacitor RemovalOven Lamp and Lamp Socket Removal Damper Assembly RemovalTurntable Motor Removal FAN Motor RemovalControl Panel Assembly and Control Unit Removal Control Unit and KEY UnitDoor Adjustment Door Replacement and AdjustmentAfter adjustment, check the following After adjustment, make sure of the followingDoor Disassembly Figure C-5. Door Replacement and adjustmentFigure S-1. Pictorial Diagram Circuit Control PanelDIP Electrical Parts Cabinet PartsControl Panel Parts Oven Parts VSDTA123ES/-3Door Parts MiscellaneousScrews Nuts and Washers Model Number HOW to Order Replacement PartsPacking and Accessories DescriptionOven Control Panel Parts Door Parts Miscellaneous 930AK 930AW
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R-930AW specifications

The Sharp R-930 series of microwave ovens, including the R-930AK, R-930AW, and R-930CS models, represent a blend of advanced technology and user-centric design. These units are well-suited for modern kitchens, offering convenience, versatility, and efficiency that meet the needs of busy households.

One of the standout features of the R-930 series is the powerful Inverter Technology. Unlike traditional microwaves that rely on pulsing power to cook food at lower settings, Inverter Technology delivers a steady stream of cooking power. This results in more even heating, improved texture, and better overall cooking results for delicate dishes like custards and sauces.

The spacious interior of these models provides ample room for cooking a variety of dishes simultaneously. The R-930 series is designed with a turntable that ensures uniform cooking by rotating food as it heats. Additionally, these microwaves often come with a variety of pre-programmed settings for popular dishes, making it easier for users to prepare meals with minimal effort. These presets take the guesswork out of cooking and help ensure consistent results every time.

The R-930AK and R-930AW models are particularly noted for their sleek and modern aesthetic, available in stylish black and white exteriors, respectively. Both models also feature user-friendly controls, which include a digital display and intuitive buttons, ensuring that even those new to microwave cooking can navigate settings with ease.

Another characteristic that distinguishes the R-930CS is its advanced sensor cooking technology. This feature monitors the cooking process and automatically adjusts power levels and cooking times to achieve optimal results. This takes the hassle out of determining how long to cook various foods, especially those that require specific attention to avoid overcooking or undercooking.

The Sharp R-930 series also emphasizes safety and convenience. Child safety locks are integrated into the design to prevent unauthorized use, making it a practical choice for families with young children. Moreover, the easy-clean interior ensures that spills and splatters can be quickly wiped away, maintaining hygiene and preserving the appliance's appearance.

In summary, the Sharp R-930AK, R-930AW, and R-930CS models are proficient microwave ovens equipped with innovative technologies and thoughtful features that cater to a variety of cooking needs. With their combination of inverter cooking technology, spacious interiors, sleek designs, and user-friendly controls, these models are ideal choices for anyone looking to enhance their culinary capabilities in a fast-paced world.
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