Question about Panasonic NN-S541 Microwave Oven

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When microwave wss turned on, there was no heat but smoke

When microwave wss turned on, there was no heat but lots of smoke & an electrical smell. Since there was no heat, what was burning to cause the smoke?

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  • William Miller
    William Miller May 11, 2010

    It may have come from grease on or behind the waveguide cover, or due to a defective high voltage transformer or inverter, depending on the model number.

    What's yours?


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  • Panasonic Master
  • 19,396 Answers

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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