Question about Microwave Ovens

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Kenmore Elite 721.66463500 Microwave died. Didn't even notice until I went to use it. Changed fuse and screen asked to enter the time of day. Entered the time and hit start. The microwave buzzed for 0.5sec and it blew the new fuse I installed.. put in another fuse and the same thing happened.. what shall I try next?

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  • rpjones5 Jun 03, 2010

    Very helpful!

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Hi


Thanks for using FixYa. Fuse inside the microwave blows off when there is something wrong with a part inside the microwave. To start with check the door switch as if that is stuck or faulty it will blow the fuse again. Another thing that can cause this is a bad fuse holder as if that is not holding the fuse tight enough the fuse will blow again. If everything else seems to be fine then it is the high voltage capacitor which is located behind the fan underneath the high voltage transformer has gone bad and needs to be replaced. Please do accept the solution if the issue is resolved or post a comment for further assistance.


Thanks
Rylee

Posted on Jun 03, 2010

  • 4 more comments 
  • rpjones5 Jun 03, 2010

    Hi,



    I measured the resistance in the noise filter. Results:
    L1-L2 < 1ohm
    N1-N2 < 1ohm
    L1 or L2 - N1 or N2 = 0ohms



    I'm thinking I need a new filter but I also was unable to measure any resistance on the sensor (Blk to Red, Red to WH, etc..)?



    what shall I try next? I've read the TCO could be to blame but not sure how to test it?

  • Rylee Smith
    Rylee Smith Jun 03, 2010

    If you have already checked the filter then yes it should be replaced however, as I said earlier please check the high voltage capacitor which is located behind the fan underneath the high voltage transformer before replacing anything else. Please do accept the solution if the issue is resolved or post a comment for further assistance.


    Thanks
    Rylee

  • rpjones5 Jun 03, 2010

    using a meter, 9V battery, and jump wires to the H.V. Capacitor and measuring from terminal to terminal I got 0V (when I should get 9V).. I guess I've got a dead H.V. Capacitor. Any other quick way to check it to make sure? Thanks!

  • Rylee Smith
    Rylee Smith Jun 03, 2010

    Yeah...thats what I thought, you have already checked how it should be checked now its time to replace it. Please do accept the solution if the issue is resolved or post a comment for further assistance.


    Thanks
    Rylee

  • rpjones5 Jun 03, 2010

    do you think the noise filter is also bad? what are the chances of both being bad?

  • Rylee Smith
    Rylee Smith Jun 03, 2010

    Chances are good, and as you have already tested both of them then it seems replacing both is always better.

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As in your case the fuse keeps on blowing, thereare couple fo things that you will have to do fix it:
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