Hi, the start button on my sharp r24st has become very difficult to press as the microswitch has almost certainly worn out. Are the microswitches available and possible to replace? ...I can't seem to find them when doing a search via google or some of the major online spares retailers. Thanks in advance Matt

SOURCE: start button problem

You will need the new & improved select button assembly and you can order them through us if you like.

We have full details, plus *critical* safety, disassembly, and troubleshooting info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk

The order form is at http://207.234.249.73/mwd/btn_form.htm

SOURCE: sharp carousel microwave model # 508ak has power

9 times out of 10 this is usually this is a bad magnetron, the other time is sometimes a bad high voltage diode. See components section. Q - My microwave is running and sounds like it is working but will not heat up anything.
A - Many thing can do this but, common things are....loose high voltage wire.....poor solder joint on board.....magnetron.....power relay.....

Q - The microwave display counts down and the inside light is on, but nothing is heating and the fan is not running.
A - This most commonly is a bad door switch, other possible problems are a faulty relay or solder joint on the power module, but a bad door switch is most common.
thanks.

SOURCE: I have a Sharp Microwave R-520 KS. And it stopped

Did you disconnect and test the three latch assembly microswitches with a multimeter or continuity tester? The top and bottom switch are normally-open, and the middle switch normally-closed. The lower switch seems to be the one that takes a beating and most often fails. It should be an Omron D3V-16G-3C25 and can be found on eBay for $10, or via an electronic parts supplier.