Question about GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

I have a ge spacemaker over the oven microwave, model no. jmv1440bh04. Last week all of a sudden it start sounding like it is only running half power. Once it quit all together but started working again after waiting a little while.

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  • parose Sep 09, 2010

    Is the fuse you are talking about a 250v, 20 amp fuse located upper right behind the grill? Seems like if the fuse was bad the microwave would not run at all, no?

  • parose Sep 09, 2010

    As you can tell I'm not very knowledgable about what I'm doing but the best that I can describe it is that it still runs and heats but sounds like it is running in slow motion. It was running fine then all sudden the pitch in the noise the microwave makes dropped. The fuse is white and has a black mark around the center, is this an indication it is bad?

  • parose Sep 09, 2010

    I replaced the fuse but it didn't help the problem. I noticed the turn table runs slow as well so I tried turning it off to see if that would change anything but it didn't. Testing the power supply and magneto, whatever that is, is above my level. I can replace the microwave myself but it is really not that old, maybe three years. I hate to replace it if it is something simple and I also don't want to call repairman and spend more money than the microwave is worth. Any other thoughts?

  • parose Sep 09, 2010

    I'm not sure what you are talking about when you say, "Is the setting on high? What setting? Where is it located? How would the setting just suddenly change when the microwave is running? I just check circuit board and there don't appear to be any burn marks or swelling/ leaking of electronic parts. I opened up the bottom and there is no belt for the motor to the turntable. It appears to be a small direct drive. Again, checking the power supply is above my level of competance.

  • parose Sep 09, 2010

    Thanks for all your help.

  • parose Sep 09, 2010

    Yes! Eventhough I was unable to pinpoint the problem I was able to rule out that the problem was not something simple. Thanks for all your help...Pat Arose

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  • 11,896 Answers

If you have it on high setting and it is not running on high, change your fuse first. You may also test the power supply and magneto if needed. The power supply may be wearing out. The magneto is what heats it up but if that was going you just would have much heat at all or no heat but microwave lights and turn table should not change

Posted on Sep 09, 2010

  • 3 more comments 
  • Nate Stansfield
    Nate Stansfield Sep 09, 2010

    If it was completely burnt out it would not work at all. The power supply is what provides power throught the microwave. This is one of the most common devices to fail in any electronic. Then there is a relay on the circuit board. Inside there are contact points that engage and disengage depending on if power is provide to that part of the circuitry system or not. This can wear out and work sometimes and not others.
    Then lastly there is the magneto. This provides heat waves.

  • Nate Stansfield
    Nate Stansfield Sep 09, 2010

    What exactly is the unit doing or not doing?

  • Nate Stansfield
    Nate Stansfield Sep 09, 2010

    Yes your fuse will need to be replaced.

  • Nate Stansfield
    Nate Stansfield Sep 09, 2010

    Is the setting on high? Have you removed the cover and looked inside to see if any of the electronical parts are swelled up or leaking? Or look for any burn marks on the circuit board? How about the belt and motor on bottom? You can test power to the motor to see if it is getting full power. If it is and motor is not spinning fastly enough, it may be worn. If not enough power is going to the motor, than power supply or capacitor/resistor issue.

  • Nate Stansfield
    Nate Stansfield Sep 09, 2010

    Not a problem. Let me know if there is ever anything else you need help with. Thank YOU.

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