Sharp R-1506, R-1500 Test Procedures, Procedure Letter Component Test Magnetron Assembly Test

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R-1500

R-1501

R-1505

R-1506

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

AMAGNETRON 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.

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 indicate 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 temperature 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 POWER 10(HIGH) 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 29.2 to 54.2˚F(16.2 to 30.1˚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 voltage is 120 volts and the oven cavity is clean.

BPOWER 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 83 ohms; 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.

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Contents 1506 Table of ContentsBefore Servicing Dont Touch Before Servicing When the testing is completedMicrowave Measurement Procedure RequirementsLeakage test Foreword Sharp PLAZA, MahwahOver the Range Microwave Oven 1500/ R-1501/ R-1505/ R-1506Grounding Instructions Product SpecificationGeneral Information DescriptionOven Diagram Control Panel LevelLight HI/ LO FAN HI/ LO Stop Clear Start Minute Plus OFF Condition Power Level P-0 to P-90 CookingOperation Description of Operating SequenceHorizontal Venting Ventilation Methods HOT AIR ExhaustVertical Venting AIR FlowFigure O-1. Oven Schematic-Off Condition Description and Function of Components Troubleshooting Guide Hood FAN MotorHood Lamp Possible Case Defective Parts Test Procedure ProblemPower Transformer Test Test ProceduresProcedure Letter Component Test Magnetron Assembly Test Microwave Output PowerHigh Voltage Capacitor Test Procedure Letter Component TestMagnetron Temperature Fuse Test High Voltage Rectifier TestSecondary Interlock Relay RY2 Primary Interlock Switch TestSecondary Interlock System Test Door Sensing Switch Monitor Switch TestHood FAN Motor Test Procedure Component Test LetterBlown Monitor Fuse Test Hood Thermal CUT-OUT TestTouch Control Panel Assembly Test Before testingWHT 3 KEY Unit Test 1ST Stage 2ND Stage Procedure Letter Component Test Relay TestFoil Pattern on the Printed Wiring Board Test Defrost Center TestSteps Occurrence Cause or Correction QKITPB035Touch Control Panel Assembly Description of LSILSI OUT Key strobe signal OUT Oven lamp, fan motor and turntable motor driving signalSignal synchronized with commercial power source frequency Internal clock oscillation frequency input settingHood motor driving signal Key strobe signalHood lamp driving signal Hood motor high / low driving signalServicing of Touch Control Panel Other PrecautionsServicing Shapes of Electronic ComponentsHood Exhaust Louver Removal Component Replacement and Adjustment ProcedureOuter Case Removal Power Transformer RemovalRe-install Pictorial DiagramThermal CUT-OUT Cavity Removal Magnetron RemovalHigh Voltage Rectifier and High Voltage Capacitor Removal Hood FAN Thermal CUT-OUT RemovalCooling FAN Motor Removal Temperature Fuse Magnetron RemovalTurntable Motor and Food Lamp Sockets Removal Positive Lock Connector NO-CASE Type RemovalControl Panel ASSEMBLY, Control Unit and KEY Unit Removal Positive lock connectorControl Unit and KEY Unit Removal Key unit locationDoor Assembly RE-INSTALL Door ReplacementAfter adjustment, check the following Door Assembly RemovalChoke Cover Door DisassemblyReplacement Door Frame AssemblyHigh Voltage Components Control UnitFigure S-2. Power Unit Circuit Unit CircuitDIP Cabinet Parts Parts ListParts marked * are used in voltage more than Electric PartsOven Parts Door PartsMiscellaneous Model Number HOW to Order Replacement PartsPacking and Accessories SCREWS,NUTS and WashersOven and Cabinet Parts Control Panel Parts Door Parts Miscellaneous Copyright 2001 by Sharp Corporation ALL Rights Reserved
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R-1506, R-1501, R-1505, R-1500 specifications

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