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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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