Question about Sharp R-1490 Microwave Oven

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Humming noise and does not heat and burning smell

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This is happening due to either the magnetron, or the Power Diode, or both, is breaking down, under load, then the unit detects the fault condition, & then, for safety reasons, to avoid a fire or explosion, shuts down the system. You need to take it in to be looked at please obtain a "Quote" before proceeding with any work. This way you can decide to repair or replace.

Posted on Jul 17, 2010

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Posted on Jan 02, 2017

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