Sharp R-216LS Test Procedures, Procedure a Magnetron Assembly Test, Microwave Output Power

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R216LS

CHAPTER 8. TEST PROCEDURES

[1] Procedure A: MAGNETRON ASSEMBLY TEST

1.Disconnect the power supply cord, and then remove outer case.

2.Open the door and block it open.

3.Discharge high voltage capacitor.

4.To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check across the magnetron filament leads should indicate less than 1 ohm.

5.To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads and chassis ground. This test should indicate an infinite resistance. If there is little or no resistance the magnetron is grounded and must be replaced.

6.Reconnect all leads removed from components during testing.

7.Reinstall the outer case (cabinet).

8.Reconnect the power supply cord after the outer case is installed.

9.Run the oven and check all functions.

1. MICROWAVE OUTPUT POWER

The following test procedure should be carried out with the microwave oven in a fully assembled condition (outer case fitted).

HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE, SO EXTREME CAUTION SHOULD BE OBSERVED.

Power output of the magnetron can be measured by performing a water temperature rise test. This test should only be used if above tests do not indi- cate a faulty magnetron and there is no defect in the following components or wiring: silicon rectifier, high voltage capacitor and power transformer. This test will require a 16 ounce (453cc) measuring cup and an accurate mercury thermometer or thermocouple type temperature tester. For accurate results, the following procedure must be followed carefully:

1.Fill the measuring cup with 16 oz. (453cc) of tap water and measure the temperature of the water with a thermometer or thermocouple tempera- ture tester. Stir the thermometer or thermocouple through the water until the temperature stabilizes. Record the temperature of the water.

2.Place the cup of water in the oven. Operate oven at P-HI (100% Power) selecting more than 60 seconds cook time. Allow the water to heat for 60 seconds, measuring with a stop watch, second hand of a watch or the digital read-out countdown.

3.Remove the cup from the oven and again measure the temperature, making sure to stir the thermometer or thermocouple through the water until the maximum temperature is recorded.

4.Subtract the cold water temperature from the hot water temperature. The normal result should be 20 to 38°F(11.1 to 21.1°C) rise in temperature. If the water temperatures are accurately measured and tested for the required time period the test results will indicate if the magnetron tube has low power output (low rise in water temperature) which would extend cooking time or high power output (high rise in water temperature) which would reduce cooking time. Because cooking time can be adjusted to compensate for power output, the magnetron tube assembly should be replaced only if the water temperature rise test indicates a power output well beyond the normal limits. The test is only accurate if the power supply line volt- age is 120 volts and the oven cavity is clean.

[2] Procedure B: POWER TRANSFORMER TEST

1.Disconnect the power supply cord, and then remove outer case.

2.Open the door and block it open.

3.Discharge high voltage capacitor.

4.Disconnect the primary input terminals and measure the resistance of the transformer with an ohmmeter. Check for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance of the primary coil should be less than 1 ohm and the resistance of the high voltage coil should be approximately 202 ohms (RTRN-A727WRZZ) or 190 ohms (RTRN-A728WRZZ); the resistance of the filament coil should be less than 1 ohm.

5.Reconnect all leads removed from components during testing.

6.Reinstall the outer case (cabinet).

7.Reconnect the power supply cord after the outer case is installed.

8.Run the oven and check all functions.

(HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE.)

[3] Procedure C: HIGH VOLTAGE RECTIFIER TEST

1.Disconnect the power supply cord, and then remove outer case.

2.Open the door and block it open.

3.Discharge high voltage capacitor.

4.Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance across the terminals and observe, reverse the leads to the rectifier terminals and observe meter reading. If a short is indicated in both directions, or if an infinite resistance is read in both direc- tions, the rectifier is probably defective and should be replaced.

5.Reconnect all leads removed from components during testing.

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Contents Model R-216LS Adjustment Procedure Precautions for Using Lead Free SolderComponent Replacement Microwave Measurement PROBefore Servicing Before Servicing When the testing is completedAfter repairing Requirements Microwave Measurement ProcedurePreparation for testing Leakage testForeword and Warning ForewordProduct Description 1 Specifications DescriptionGrounding Instructions Oven DiagramGeneral Information OvenTouch Control Panel Description of Operating Sequence Power Level CookingPower Output Reduction OFF ConditionOff Condition Schematic Door Closed Clock Appears on DisplayOven Schenatic Cooking ConditionDescription and Function of Components Troubleshooting Guide Troubleshooting ChartProcedure B Power Transformer Test Test ProceduresProcedure a Magnetron Assembly Test Procedure C High Voltage Rectifier TestProcedure F Secondary Interlock Switch Test Procedure D High Voltage Capacitor TestProcedure E Temperature Fuse Oven Test Procedure F Primary Interlock System TestPrimary Interlock Relay RY2 Procedure G Monitor Switch TestProcedure H Blown Minitor Fuse Test Key Unit Procedure I Noise Filter TestProcedure J Touch Control Panel Assembly Test Control UnitProcedure K KEY Unit Test Procedure L Relay TestProcedure M Defrost Test Procedure N Foil Pattern on the Printed Wiring Board TestR216LS Outline of Touch Control Panel Touch Control Panel AssemblyPrecautions for Handling Electronic Components Servicing for Touch Control PanelOther Precautions Servicing ToolsEmploying lead-free solder Precautions for Using LEAD-FREE SolderUsing lead-free wire solder SolderingComponent Replacement and Adjustment PROCE- Dure Outer Case RemovalReinstall Power Transformer RemovalPositive Lock Connector NO-CASE Type Removal Magnetron RemovalTrol Panel Assembly Removal Control Panel Assembly RemovalGraphic Sheet and Membrane Switch Replacement Cooling FAN Motor Removal Power Supply Cord ReplacementTurntable Motor Removal Make Sure That the FAN Blade Rotates Smooth After Installed InstallationAdjustment Make Sure That the Axis of the Shaft is not SlantedAfter any service, make sure of the following Door ReplacementAfter adjustment, check the following Figure C-7. Door Replacement Sealer FilmDiagrams Pictorial Diagram FigureControl Panel Circuit Figure S-2 Liquid Crystal DisplayUnit Printed Wiring Board Figure S-3DIP CodeMeno Parts Guide Oven Parts Oven Parts Parts Code Price NEW Description Rank MarkDoor and Control Panel Parts Door and Control Panel Parts „INDEX

R-216LS specifications

The Sharp R-216LS is a versatile microwave oven that combines affordability with a range of features designed to enhance your cooking experience. Compact yet powerful, this model is especially suitable for small kitchens or dorm rooms, where space is at a premium.

One of the standout features of the Sharp R-216LS is its impressive 800 watts of cooking power. This ensures quick and efficient heating, allowing users to prepare meals in a fraction of the time compared to conventional ovens. The microwave also features a variety of power levels, providing flexibility for different types of cooking and reheating tasks, from defrosting frozen food to cooking delicate items like baked goods.

The R-216LS comes equipped with a spacious 20-liter capacity, which is surprisingly roomy for its size. This allows for ample space to heat up large dishes or multiple servings at once. The interior is designed with easy cleaning in mind, featuring a non-stick coating that prevents food from adhering to the surfaces and simplifies maintenance.

In terms of usability, the Sharp R-216LS boasts a user-friendly interface with straightforward knobs and buttons. It includes a timer and a range of pre-programmed cooking options, enabling users to cook a variety of foods with just the touch of a button. This is particularly beneficial for those new to microwave cooking or for busy individuals looking to save time.

The microwave also incorporates advanced technologies, including inverter microwave technology, which provides a continuous stream of cooking power for more even heating and defrosting. This ensures that your food is cooked thoroughly without the risk of hot and cold spots.

Safety is another priority in the design of the R-216LS. It features a child safety lock, which prevents accidental operation, making it a perfect choice for families with young children. The model also has an automatic shut-off feature, ensuring that the microwave turns off when not in use.

In summary, the Sharp R-216LS is a compact microwave that offers a blend of power, convenience, and safety features, making it an excellent choice for anyone seeking a reliable cooking appliance. Whether for reheating leftovers, cooking meals, or defrosting ingredients, this microwave is designed to meet the diverse needs of modern kitchens. With its combination of thoughtful design and functionality, the R-216LS stands out as a worthy investment for those looking for efficiency and performance in their cooking appliances.
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