Question about Panasonic NN-S543BFW Microwave Oven
Unit is approx 3yrs old; the magnatron was replaced under warranty w/in a few months of intial use. The symptoms are: magnatron shows no resistance to casing, filament is not open (measures less than .3 ohms), no visible signs of arcing, had recently shown signs of intermitt door swith - could have been physical latch/position failure as pushing on door harder was good remedy. Never really cared much for this oven - it was a gift. The oven this replaced was a Gen-Air/Amana? that was built like a tank, & lasted approx 15-20yrs. It's the only device in my home that causes interference in bluetooth audio devices - probably from the inverter ckt. If I could confirm a defective magnetron, it's dumpster fill!
Check the resistance of the capacitor across the cap terminals and to ground. It should be open. Also check the diode for a short. Lastly, on some models a defective or misaligned door switch can blow fuses.
Hope that helped...
Posted on Mar 28, 2008
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