Question about Panasonic NN-S541 Microwave Oven
My microwave oven is making a popping sound and it smells of electrical smoke after I turn it off. What could be causing it?
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Posted on Jan 02, 2017
The high-voltage transformer (or inverter transformer) has probably failed.
Due to the lethal voltages used and produced, I do not recommend that an inexperienced person work on these.
I would recommend that you contact your nearest Panasonic-authorized servicer.
You can find one here:
Posted on Nov 05, 2007
The sound you heard could be any number of things but I would attempt to verify the basic preformance of the microwave was ok by placing a cup of water in the cooking compartment and switching the micro on for about 2 minutes.. The water should be close to or at a boil after this time ( depending on glass type and power output of oven). Listen for any other irregular sounds while it is running. You may have heard something in the soup pop or some of the electronics within the micro arc but it may not mean it is dangerous. Try the water test first and if it continues to exibit internal noises and burning a burning smell, I would discrad the oven. Table top models are very inexpensive and the cost to diagnose and repair would probably exceed the cost to replace,
In terms of dangerous, there are safety devices to cut off power to the magnetron and other components if warranted. Not sure that helps you but with limited info from your side, diagnostics are 'iffy' at best..
Posted on Jan 09, 2009
you must remove the MW take off the cover then look for a large metal can (capacitor) and a white (ceramic) fuse...look and, smell and, you should find the cause
Posted on Apr 22, 2009
Test the high voltage capacitor,
the rectifier diode.or the magnetron. If all this are fine, test the control board.
If it additionally does not spin and no light, then check also the door switch and fuse.
The diode and capacitors can br tested. The capacitor must be allowed discharge before testing, or you risk to get electrocuted, even if power is off. Capacitors can get discharged by shorting their two contacts.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.
All locations, and description of this parts can be located using the diagram here: Counter top.
Parts must be tested to find out what is wrong.
Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.
Regarding parts, contact the seller here to purchase parts. (here in UK).
Posted on Apr 27, 2009
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