sorry to be so long ,, have to take my insulin ,,, it will be eather a diode, capacitor or hi-voltage transformer ,, all these parts are hi-voltage so you need to read this before you get into it ,, here is links to the parts:

http://www.searspartsdirect.com/partsdirect/getSubComp.pd?modelNumber=R-1870&productCategoryId=0123370&brandId=0958&modelName=MICROWAVE&diagramPageId=00001&componentDescription=CABINET%20PARTS&documentId=50020288&blt=06

be careful and should if you need me / larry

Consumer Product Safety Commission

Electrocution Hazard with Do-It-Yourself Repairs of Microwave Ovens

CPSC Document #5061

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The U. S. Consumer Product Safety Commission (CPSC) warns against do-it-yourself repairs of microwave ovens. Each year, on average, four people die from electrocution trying to repair their microwave ovens. Microwave ovens use high voltage which makes it particularly hazardous for consumers to remove the cover and touch electrical parts. The possibility for electrical shock from a microwave oven still exists even after the oven is disconnected from the power source. Should certain internal devices fail, even unplugged ovens can cause serious injury.

The Commission strongly recommends that consumers have professionals repair microwave ovens because electrical appliances can be hazardous if consumers expose live electrical parts.

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/!\ WARNING

ELECTROCUTION HAZARD
HIGH VOLTAGE

Removing the cover of your microwave oven and touching an electrical part can kill you.

Have a professional repair your microvave oven.