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fieldcom  
#1 Posted : Saturday, July 5, 2008 9:59:49 AM(UTC)
fieldcom

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Joined: 7/5/2008(UTC)
Posts: 1

Unit is a combination under cabinet unit. While cooking on the stove top I tried to use the Microwave and when started it make a loud crack and would no longer microwave anything. Everything else works including the convection portion.

Please advise
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richappy  
#2 Posted : Sunday, July 6, 2008 3:30:33 AM(UTC)
richappy

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Probably a high voltage diode popped. To confirm, I take the outer cover off the microwave and discharge the high voltage capacitor by shorting its terminals.
I then pull the plug off the magnetron side and place it near the magnetron socket. Now turn the microwave on and push the connector on the magnetron with a chopstick or a long insulated screwdriver. If no arc when you do this this confirms a bad diode.
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