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Sharp over the range microwave, no heat when turned on an a loud humming noise

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HI, there are two issues here. the Magnetron tube and the noise filter has failed.

Just to make sure of the Magnetron failure, expose the device and, check the Magnetron temp fuse located near the device. this fuse will show no continuity when tested if faulty. if it testes out ok, replace the magnetron.

Posted on Jun 19, 2009

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Posted on Jan 02, 2017

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