How do i replace the magnatron on a kitchen aid khms147kss

Hello James
Having a 20 amps fuse is a bit high in todays standard as 15 amps fuses are recommended these days - they do not want too much current to go through the house wires.
Better to buy a new microwave as this microwave could burn down your house.

Based on you information, if you disconnected magnatron and unit ran with no fuse problem, I would suspect magnatron. You should consider the age of unit it, may be be a better alternative to replace it.

Pc board problem its need technician

you can buy that part online kitchen aid.

web search-kitchen aid range manuals- or -kitchen.manualsonline.com

Your problem is your mag tube (Magnatron) you can go to www.partsselect.com and your part number is PS2352604. Their price is $123.44. I work on micro waves myself and have found that if one isn't a built in over the stove like yours, they are not worth repairing because you can buy one cheaper. If this unit is not real old and you can replace this parts yourself it might be worth fixing bit if you are going to have it repaired, it might be cheaper to replace it. Good luck.

P.S. If you open this unit up. Make sure you bleed the capacitor off, this is one that will knock the _ _ _ out of you if you ground it by touching it. Bleed it by using screw driver to short capacitor to ground or case.
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more than likely the fuse has blown onthe magnatron it is the button looking thing on the magnatron with two wires. there are 2 of these one is on the magnatron the other is above the heat box test these for open. if open replace. if good then replace the magnatron.

There should be one tucked away behind the control panel.

If you don't find it, feel free to reply here or to me directly via my site (see below) and I can e-mail it to you.

If you tell me what your symptoms are, I can probably help you figure it out.

You'll find a link to our site in our listing here on FixYa: http://tinyurl.com/yzjozk

The high-voltage transformer being overloaded by something shorting it out. Either the magnatron or the high-voltage capacitor and diode. Replace the capacitor and diode then if still not working, replace the magnatron. The magnatron is only affordable to do it yourself - buy the part on EBAY - lookup "universal magnatron"
Hope ya fix it!