Sharp R-1870 Microwave Measurement Procedure, A. Requirements, B. Preparation for testing

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MICROWAVE MEASUREMENT PROCEDURE

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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±5C (68F) 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 SHARP ELECTRONICS CORPORATION sales service only TABLE OF CONTENTSSUPPLEMENTAL SERVICE MANUAL Service Headquarters Sharp Plaza, Mahwah, New JerseyBEFORE SERVICING WARNING TO SERVICE PERSONNEL After repairingDont Touch Danger High Voltage Before ServicingMICROWAVE MEASUREMENT PROCEDURE B. Preparation for testingA. Requirements C. Leakage testDANGER SHARP PLAZA, MAHWAH NEW JERSEYSERVICE MANUAL If provided, Vent Hood, Fan assembly, Cooling Fan MotorSPECIFICATION GENERAL INFORMATIONDESCRIPTION GROUNDING INSTRUCTIONSOVEN DIAGRAM POWER LEVEL P-0 TO P-90 COOKING OPERATIONDESCRIPTION OF OPERATING SEQUENCE OFF CONDITIONFigure O-2. Oven Schematic - Microwave Cooking Condition Figure O-1. Oven Schematic - Off ConditionFigure O-4. Oven Schematic - Automatic Mix cooking Condition NOTE RY2 and RY3 will alternately close during cook cyclePROCEDURE LETTERCOMPONENT TEST R KEY UNIT TESTFigure S-1. Pictorial Diagram HIGH VOLTAGE COMPONENTS8 7 0 8 7 R - 1 RFigure S-2. Touch Control Panel Circuit R - 1 8 7 0 R - 1 8 7PARTS LIST Note The parts marked “∆” may cause undue microwave exposureELECTRIC PARTS CABINET PARTSOVEN PARTS CODEDOOR PARTS MISCELLANEOUSSCREWS,NUTS AND WASHERS HOW TO ORDER REPLACEMENT PARTSOrder Parts from the authrized SHARP parts Distributor for your area OVEN AND CABINET PARTS CONTROL PANEL PARTS PACKING AND ACCESSORIES 6-2 INSTALLATION INSTRUCTION 6-7 COOK BOOK 6-3 OPERATION MANUAL6-1 INSTALL MATERIAL ASSEMBLY 4-1 EXHAUST DAMPER ASSEMBLY ACCESSORY PACK BOTTOM PADR - 1 8 7 R - 1 8 7 R - 1 8 7 R - 1 8 7 R - 1 8 7 R - 1 8 7 COPYRIGHT 2001 BY SHARP CORPORATION ALL RIGHTS RESERVED 01 SHARP CORP. 9M2.60E Printed in U.S.A
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R-1870 specifications

The Sharp R-1870, R-1871, R-1870BK, and R-1872 microwaves are advanced kitchen appliances designed for efficiency and convenience in meal preparation. These models are known for their innovative features and technologies that enhance everyday cooking.

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