look inside and see if it has push type pins holding the top cover on or a way to remove it.pull it out and you will find a metal fan blade,this is called the distributor fan. turn on microwave and make sure its turning.some were belt driven,some just turned from force of air blowing across them.make sure its clean,and that it turns freely.sparking and popping generally means magnatron and all related parts are working,but burning grease or moisture has eaten through paint and bare metal is showing.You can buy paint at any parts house to touch it up.dist fan is metal but because it turns it doesnt spark just reflects microwave energy around inside of cabinet evenly.without it unit will not cook or heat evenly because its only heating in one small spot.keypad and all is low voltage and wont spark,120volt all the way until high voltage transformer is fuse protected so any sparks or shorts would blow fuse,diode would burn out, so sparks more than likely are from the energy radiated from magnatron.if it was tube itself it would die very quickly.( something like 50,000 volts there) hope this helps!I'm not even sure you could replace one of those nowdays.been many years since I sold and repaired appliances but those were always a problem,moisture in keypads caused all kinds of trouble on the early ones.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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