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Hi. Most likely there is shorted diode or grounded magnetron. Use the multimeter to run continuity test. Before handling the diode properly discharge the hi-voltage capacitor. If diode shows continuity-replace it. If the magnetron filament contacts shows continuity to the body-replace the magnetron. You actually may replace both the, price of the diode is only few dollars. Part number: WB27X1160
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When turned on would make a loud buzzing noise. Turn off &back on workrd fine. Now will only come on and make buzzing sound, no heat.
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