Question about Sharp R-402J Microwave Oven

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Sharp R-402JKF microwave

I came home and noticed the display on the microwave said 'ERROR'. The keypad doesn't work. I unplugged it for a minute and plugged it back in. Now the display flashes 00:00. The only button that works (and makes a noise) is the night light. Any suggestions before I take it in for repair?

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Well guess what! MINE JUST STARTED ON FIRE! Unbelievable, I'm awaiting a reply from Sharp. A fire ball came out the right side, inside and now rests a hole.

Posted on Mar 17, 2008

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It sounds like your electronic board has malfunctioned. It may have to be replaced, sometime it is cheaper to buy a new oven. Technician's fees and parts may be more than it it worth.

Posted on Dec 26, 2007

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Posted on Jan 02, 2017

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First I would suggest a "hard reset". Simply unplug the oven for a minute or two, then try again.

If it still fails, it may be that the keypad has failed, or there is a bad connection due to moisture, grease, etc.

This is an Australian model, so it's hard for me to give more specific information.

But one some US models the LCD and keypad connect to the circuit board via a rubber "zebra strip" and losing that connection can result in a loss of display segments and / or key response.

I've attached a diagram showing where one can clean to restore operation in this case.

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We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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I've attached the portion of the manual which shows how to lock & unlock this model.

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We're happy to help and we appreciate your thoughtful rating of our answer.

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