SOURCE: Microwave oven blowing 20 amp ceramic fuse
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.
SOURCE: how can i convert our 220 volts wall outlet to 110
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
http://cgi.ebay.com/1000-Watt-Voltage-Converter-Transformer-110-120-220-240_W0QQitemZ360235854330QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item53dfbae9fa
SOURCE: When you start the oven
Hi. Check the heating element. Possible there is a need to replace that one. This is the source of the problem.
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