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Re: Above the stove micrwave blows fuse when hitting the...
There is a component in the High Voltage section that is shorted. Either the capacitor, diode, transformer or the mag. Dangerous area to work in if not trained in proper precautions. Eric
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This will be either a faulty door interlock switch or High voltage component. You will need to remove the outer cover after first disconnecting power. Discharge the high voltage capactitor!
Check the door switches are operating correctly if so move on to the high voltage components starting with the transformer
you have one of three problems (H.V. diode shorted or leaky, H.V.capicitor shorted, or the magnrtron tube is beginning to draw excessive current)if thats the case its not usually worth spending that for the mag.,the other two items aren't that expensive
Yes, There are fuses inside the keyboard panel. I would have to take a look at the manual for the specific model you have to identify the easiest way to check the fuse. Before you go that far check above the hood and see if you can locate the plug end of the microwave. Most installations have a dedicated receptacle above the exhaust vent and microwave. It is usually a space too small for good storage so most housewives store small items and cookbooks in this space. It is usually the culprit for a microwave suddenly going out without someone placing metal inside the oven and heating it. Heating a metal object or operating a microwave for an extended time will usually blow the fuse.
If it blows the fuse as soon as you hit the START button, it's almost certainly a shorted high-voltage capacitor.
If it blows a few seconds after you hit the START button, it's probably the high-voltage transformer. You'll possibly also smell a faint electrical burning smell from the rear vent after you shut if off.
If it blows the fuse as soon as it's plugged in, you probably have a shorted door switch, a shorted varistor, or an internally exposed wire shorting to the chassis, etc.
If it blows the fuse as soon as you hit the START button, it's almost certainly a shorted high-voltage capacitor.
If it blows a few seconds after you hit the START button, it's probably the high-voltage transformer. You'll possibly also smell a faint electrical burning smell from the rear vent after you shut if off.
If it blows the fuse as soon as it's plugged in, you probably have a shorted door switch, a shorted varistor, or an internally exposed wire shorting to the chassis, etc.
Be doubly sure your microwave is unplugged first, of course!
Be sure the fuse is not loose in the holder.
If you can rotate it in the holder easily with just a thumb and finger, then it's too loose and the holder should also be replaced.
That looseness causes a heat buildup, which makes the fuse melt open inside over time.
If the new fuse blows as soon as you hit START then you likely have a shorted high-voltage capacitor.
If it blows again a few seconds or minutes after you hit START, then you likely have a bad high-voltage transformer or magnetron.
It's not inherently unsafe to replace a fuse, as long as you heed the safety rules. The microwave does contain and prodcue voltages that can be instantly lethal.
Feel free to see my safety info via my listing here on FixYa: http://tinyurl.com/yzjozk
WARNING: Microwave ovens are the most dangerous consumer appliance to
service due to up to 5,000 V at high current inside. Even with the
power off, there is a HV capacitor that can produce a lethal kick. This capacitor must be discharged before touching anything in the microwave generator circuitry.
DON'T remove the cover yourself unless you fully undertand the SAFETY issues involved in working inside a microwave oven. A microwave oven is possibly THE MOST DANGEROUS common consumer product to service.
About the only "easy" fix would be a blown fuse, if it keeps blowing, don't go any further unless you know what you are doing.
Your likely options are a blown high voltage cap, diode, or the magnetron.
Good luck(but luck has nothing to do with it ;] )
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