Sharp R-930AW service manual Microwave Measurement Procedure, Requirements, Leakage test

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R-930AK

R-930AW

MICROWAVE MEASUREMENT PROCEDURE

A. Requirements:

1)Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed 1mW/cm2 at any point 5cm or more from the external surface of the oven, measured prior to acquisition by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2 at any point 5cm or more from the external surface of the oven.

2)Safety interlock switches

Primary interlock relay and door sensing switch shall prevent microwave radiation emission in excess of the requirement as above mentioned, secondary interlock switch shall prevent microwave radiation emission in excess of 5 mW/cm2 at any point 5cm or more from the external surface of the oven.

B. Preparation for testing:

Before beginning the actual measurement of leakage, proceed as follows:

1)Make sure that the actual instrument is operating normally as specified in its instruction booklet.

Important:

Survey instruments that comply with the requirement for instrumentation as prescribed by the performance standard for microwave ovens, 21 CFR 1030.10(c)(3)(i), must be used for testing.

2)Place the oven tray in the oven cavity.

3)Place the load of 275±15 ml (9.8 oz) of tap water initially at 20±5˚C (68˚F) in the center of the oven cavity.

The water container shall be a low form of 600 ml (20 oz) beaker with an inside diameter of approx. 8.5 cm (3-1/2 in.) and made of an electrically nonconductive material such as glass or plastic.

The placing of this standard load in the oven is important not only to protect the oven, but also to insure that any leakage is measured accurately.

4)Set the cooking control on Full Power Cooking Mode

5)Close the door and select a cook cycle of several minutes. If the water begins to boil before the survey is completed, replace it with 275 ml of cool water.

C. Leakage test:

Closed-door leakage test (microwave measurement)

1)Grasp the probe of the survey instrument and hold it perpendicular to the gap between the door and the body of the oven.

2)Move the probe slowly, not faster than 1 in./sec. (2.5 cm/sec.) along the gap, watching for the maximum indication on the meter.

3)Check for leakage at the door screen, sheet metal seams and other accessible positions where the continuity of the metal has been breached (eg., around the switches, indicator, and vents).

While testing for leakage around the door pull the door away from the front of the oven as far as is permitted by the closed latch assembly.

4)Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW/cm2, and that the secondary interlock switch does turn the oven OFF before any door movement.

NOTE: After servicing, record data on service invoice and microwave leakage report.

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Contents Table of Contents Convection Microwave Oven930AK 930AW Before Servicing Requirements Microwave Measurement ProcedureLeakage test Sharp PLAZA, Mahwah Convection Microwave Oven930AK / R-930AW ForewordSpecification General InformationDescription Grounding InstructionsOven Diagram Touch Control PanelPower Level P-0 to P-90 Cooking OperationDescription of Operating Sequence OFF ConditionConvection Cooking Condition Automatic MIX Cooking ConditionSensor Cooking Condition Preheating ConditionFire Sensing Feature Microwave Mode Compu BROIL/ Compu ROAST/ Compu BakeCompu Defrost Cooking Cooking SequenceSchematic Diagram Figure O-1. Oven Schematic-OFF ConditionFigure O-4. Oven Schematic-Convection Cooking Condition Description and Function of Components Troubleshooting Guide Heating ElementConvection Cooking System Damper OPEN-CLOSE MechanismTest Procedure Problem Possible Cause Defective PartsTest Procedures Procedure Component Test Letter Magnetron Assembly TestPower Transformer Test High Voltage Rectifier TestProcedure Component Test Letter Secondary Interlock Switch TestMonitor Switch Temperature Fuse TestTest Procedures Component Test Letter Damper Switch TestChecking Temperature in the Convection Mode Thermal CUT-OUT TestTouch Control Panel Assembly Test Outer Case Switch TestKEY Unit Test Relay Test Weight 1ST Stage 2ND Stage 3RD Stage 4TH Stage Level TimeCompu Defrost Test Occurrence Cause or Correction AH Sensor TestChecking the initial sensor cooking condition Water load cooking testTest Procedures Letter Component Test Testing Method for AH Sensor AND/OR Control UnitChecking Control Unit R1,R2 22Ω ± R3 4.3kΩ ± 5% 1/4WTouch Control Panel Assembly ThermistorDescription of LSI LSIIZA797DRTOR Signal similar to P27 Segment data signalsSegment data signal Key strobe signalAbsolute Humidity Sensor Circuit Structure of Absolute Humidity SensorServicing Component Replacement and Adjustment Procedure Outer Case Switches ReplacementPower Transformer Removal Outer Case RemovalHigh Voltage Rectifier Assembly Removal Positive Lock Connector NO-CASE Type RemovalMagnetron Removal High Voltage Capacitor RemovalDamper Assembly Removal Turntable Motor RemovalOven Lamp and Lamp Socket Removal FAN Motor RemovalControl Panel Assembly and Control Unit Removal Control Unit and KEY UnitDoor Replacement and Adjustment After adjustment, check the followingDoor Adjustment After adjustment, make sure of the followingDoor Disassembly Figure C-5. Door Replacement and adjustmentFigure S-1. Pictorial Diagram Circuit Control PanelDIP Cabinet Parts Electrical PartsControl Panel Parts Oven Parts VSDTA123ES/-3Miscellaneous Door PartsScrews Nuts and Washers HOW to Order Replacement Parts Packing and AccessoriesModel Number DescriptionOven Control Panel Parts Door Parts Miscellaneous 930AK 930AW
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