Question about Panasonic NN-L931WF 1200 Watts Microwave Oven

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Hi, I have a 1200W 44 litre Panasonic Microwave Oven model NN-S752WF. My wife was cooking some vegetables when she called me. The vegetables were still cold and there was a burnt plastic / insulation type smell and the top cover of the microwave on the right hand side behind the control panel was too hot to touch. I disconnected the power lead and after it cooled I removed the cover. The only thing I could see that looked burnt was the plastic shroud that holds the light on the left of the magnatron. The bottom part of the white plastic shroud at about 2 o clock above the shroud securing screw, is melted onto the bottom left of the magnatron. I have since put a glass of water in the oven to try it. I set 1 min, started it and noticed the light did not come on and it stopped after about 20 secs with no beeping and the glass of water was still cold. There you have it now please what is the problem and how to fix? Thank you, Rick.

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  • polmarik Apr 10, 2011

    Hi Paul, I appreciate your concerns. I was just wondering if in fact it was the magnatron at fault or something else that maybe controls the magnatron. If it is the magnatron itself I know I can get a new one and install it easy. It is just with the cost of a new magnatron I want to make sure first before I get one. What are your thoughts.
    Thanks again,

  • polmarik Apr 11, 2011

    Hi I would like to get at least 1 or 2 more opinions as to what my problem is with my 1200W Panasonic microwave model NN-S752WF is please.
    Thank you very much,

  • polmarik Apr 18, 2011

    I installed a new magnatron and so far all seems to be working well.
    Thank you,



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It seems to me that the magnetron has burnt and failed. So if there is no heating please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is faulty, the temperature cut off is faulty or the main capacitor is short. It is also quite possible that insect can get into the oven and create soft spots. When you switch on these will create a short and make the voltage jump and in the long run damage the magnetron.
So Remove cover after disconnecting , check for dirt/moisture in the cabin, if so wipe clean and dry, check the magnetron and area clean and use an jet air to clean off. If there is soft spots on the magnetron and visible damage seen on the magnetron then it has failed. Finally after drying and a full clean up ,
keeping clear of the microwave, switch on, use a cup of water inside to test.
If you notice any sparks shut off as the magnetron is faulty. replace with same type.

Posted on Apr 11, 2011

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any signs of extreme heat, that close to the magnetron, could suggest a fault in the magnetron itself.
this is not something i would recommend trying to repair yourself due to the risk of radiation emission.

any problems near the magnetron, should be repaired by a microwave repair engineer who can test the machne to ensure that there is no harmful radiation emitted.

sorry i cannot be more helpful with this, but i feel that this is something that needs to be repaired professionally for safety reasons and i would not be acting responsibly if i encouraged you to try this repair yourself

Posted on Apr 10, 2011

  • paul miles Apr 10, 2011

    to get that hot, my guess would be a magnetron fault, but the wiring around the light fitting should be carefully checked as well



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