Question about Microwave Ovens
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Posted on Jan 02, 2017
Chances are if the varistor fails, it fails drastically causing a short circuit across the supply. It will sit across the supply (it will look like a thick ceramic capacitor) and you can check for continuity after isolating that at one end. If it shows low resistance (it should show almost open circuit with a Digital meter), replace it.
It need not be the culprit. If you are familiar working with High voltage circuits ( they are lethal inside a microwave ovens as the current capability is high here), you can discharge the doubler capacitor and isolate the high voltage diode to check for shorts in the HT area.
Posted on Mar 18, 2009
You simply get a 22o Volt to 120 Volt stepdown isolation transformer, these can be readily obtained from any good transformer manufacturer or say eBay, Craig's list etc.
like in the link below
Posted on Mar 11, 2010
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