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I suspected the magnetron is weak or failing. I ordered a new magnetron from sears. They sent me a whirlpool P/N 2M261-M22. Is this the correct magnetron for my microwave? Also where is the magnetron located in my microwave?

Posted by daventonia2 on

  • daventonia2 Dec 08, 2009

    Is my assumption that the magnetron is failing a good assumption. The symptoms are that it takes a lot longer to defrost, reheat, and cook food items.

  • daventonia2 Dec 09, 2009

    thank you, I feel that your advice is technicaly excellent. David Swarner



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I don't see the model # of your microwave listed here but if you have the new magnetron in hand than you know what to look for.
A word of Caution regarding the Magnetron and Microwave HV Capacitor - The HV capacitor must be discharged before working on the magnetron - the capacitor holds a potentialy lethal charge even when the set is unplugged.
The Magnatron is located usually on the right hand side, upper, center of the microwave. Once the back cover is removed it will be easy to identify by comparing wth the new one - the top part will not be exposed and there will be a two HV (high voltage) wires (usually red) connected to it and four screws or bolts holding it in place. The part # is on the old one and you can compare this to your part #. The part # you mention is common and crossreferenceable to a few other magnetrons.
The HV capacitor is a oblonged shped cylinder can with a component (diode) across its terminals - to discharge be sure the set is unplugged and short the terminals to chassis ground.
Reply to this post if you have further questions.

Posted on Dec 08, 2009

  • Anonymous Dec 08, 2009

    The assumption that the magnetron is bad because it dosn't heat as well as before is not necessarily true but is possible.

    The magnetron operates either full on or not on (off) it dosn't generally deteriorate with time.

    The problem could be the stirer fan is not distributing the heat evenly or there is arching occuring at some internal point that robs energy from the heating process.

    It could also be that the magnatron is cutting in and out of operation and therefore not giving you full power continuosly.

    High medium and low temperature of a microwave heating is not a function of the power fed to the magnetron but a function of how often the magnetron receives it's preset full power on.

    In other words the power is not varied but the amount of time is varied.

    Check this by heating the same amount of water for the same amount of time (on high setting) and checking for consistent heating - it should always be the same.

  • Anonymous Dec 09, 2009

    Your welcome and thanks for the feedback.



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