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Sharp Micro(R-1480) No Heat now after replacing bottom of 3 door switches,was working fine before.(Switch was replaced as a closed door did not activate a start.) All wires are hooked up properly.With bad switch it was heating with door slightly ajar - now new switch,all else works(table,lights,timer)- no heat. Thanks, Mark, Waukesha

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  • ForwardOnWI Apr 24, 2010

    Thanks firesnake- I noticed that the heating noise (even though not heating now) is at least twice as loud..does that mean any certain component (rectifier too?). Thanks again!

  • ForwardOnWI Apr 24, 2010

    Thanks Firesnake for your insight!

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  • Microwave Ovens Master
  • 2,923 Answers

Mark,

Based on your statement, I would think that the problem is the magnetron of your microwave.

You need to have a pro to check the first the capacitors, fuse, and resistors that might prevent the magnetron to work. If the components are good, then the problem is the magnetron and needs to be replaced.

Thank you and good luck!

Posted on Apr 24, 2010

  • Melvin Ramos
    Melvin Ramos Apr 24, 2010

    Mark,

    You are correct, rectifier might be the one causing the noise.

    Thank you!


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That would probably be a bad secondary interlock (bottom door switch) or its mount.

We have the full service manual for this model and have uploaded it to our site here to help you.

You will need the
free Acrobat Reader to view or print it in case you don't have it.

Door switch or mount trouble is usually caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.

The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.

Sometimes it's a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under the bottom edge of the switch.

If you only need a switch, you can order a universal type here for $5 postpaid.

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

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We have the R1480-series service manual for this model and have uploaded it to our site here to help you.

You will need the free Adobe Reader to view or print it.

Double-check your wiring against the "pictorial diagram".

The switches will have a "C" (common) terminal, and a "NO" (normally open) terminal, and some will have a "NC" (normally closed) terminal.

As long as those connections are the same and the voltage and current (amps) ratings are the same or higher, any number of switches will work.

Even though a door switch clicks, it may still be bad inside. Its continuity must be checked.

Door switch or mount trouble can be caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.

The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.

Sometimes it's a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under the bottom edge of the switch.

It's easier to secure the switches with hot glue than to replace the latch heads, by the way.

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

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It's probably a broken tab on the dooir switch mount or a screw holding the door switch mounts is loose.

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If you or a friend decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

You can find an exploded view and order parts by entering your FULL model number here: http://www3.sears.com (the 3 is correct)

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