Microwave oven catches on fire. Repairable?

Discussion in 'Hobby Electronics' started by w_j_wolfe2o03@yahoo.com, Jul 3, 2007.

  1. Guest

    G'day. I have a small problem with my Samsung microwave where it
    occasionally catches on fire. It last occurred when I was heating 2T
    of margarine in a cup. I heard a bang, then saw the fire coming from
    behind a cover which is presumably where the magnetron tube is. But I
    have used the oven since, and it is still working fine. This same
    sudden fire problem occurred many months before, where again, the oven
    worked fine afterward. I have melted margarine like this many times
    since and used the oven many times during those months, so I don't
    know why all of a sudden it decides to go pyro on me.

    That's the basis of my query: Can anyone tell me what might be causing
    this, what to check and how to fix it so it doesn't happen again? I do
    not want to risk fire when I am not around to monitor what's going on
    with the oven, but at the same time, I do not want to replace it. I
    have looked at getting another oven, but there's nothing that I like
    as much as my Samsung. It has the size, the looks and the advanced
    controls (ie. one touch, defrosting, etc) that I like.

    This is a pic of what the damage looks like on the interior:

    http://www.mediafire.com/imageview.php?quickkey=ezsdlmtxmvt&thumb=4


    And one of the exterior:

    http://www.mediafire.com/imageview.php?quickkey=csddinoyvgd&thumb=4
     
    , Jul 3, 2007
    #1
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  2. wrote:
    > G'day. I have a small problem with my Samsung microwave where it
    > occasionally catches on fire. It last occurred when I was heating 2T
    > of margarine in a cup. I heard a bang, then saw the fire coming from
    > behind a cover which is presumably where the magnetron tube is. But I
    > have used the oven since, and it is still working fine. This same
    > sudden fire problem occurred many months before, where again, the oven
    > worked fine afterward. I have melted margarine like this many times
    > since and used the oven many times during those months, so I don't
    > know why all of a sudden it decides to go pyro on me.
    >
    > That's the basis of my query: Can anyone tell me what might be causing
    > this, what to check and how to fix it so it doesn't happen again? I do
    > not want to risk fire when I am not around to monitor what's going on
    > with the oven, but at the same time, I do not want to replace it. I
    > have looked at getting another oven, but there's nothing that I like
    > as much as my Samsung. It has the size, the looks and the advanced
    > controls (ie. one touch, defrosting, etc) that I like.
    >
    > This is a pic of what the damage looks like on the interior:
    >
    > http://www.mediafire.com/imageview.php?quickkey=ezsdlmtxmvt&thumb=4
    >
    >
    > And one of the exterior:
    >
    > http://www.mediafire.com/imageview.php?quickkey=csddinoyvgd&thumb=4
    >


    general concensus is that a piece of food got stuck in the gap between
    the cover and the internal shell.

    remove the small cover, sand the area with fine wet and dry (1200 grit
    or higher) til smooth and coat the area with a paint designed to adhere
    to metal surfaces.
     
    matt2 - amstereo, Jul 3, 2007
    #2
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  3. http://www.partselect.com/microwave routine-cleaning repair.htm

    > If the internal cavity has any burn spots,

    sand them smooth and then paint over them with
    microwave touch up paint. If your microwave has
    any burn holes in the cavity, call an appliance
    repair technician and refrain from using the unit.
    If the wave guide has burn spots on it, replace it
    along with conducting a thorough cleaning. If you
    think any food has slipped through the perimeter of the
    wave guide cover and into either the roof or the walls
    of the oven cabinet, then remove the waveguide cover and
    throughly clean the area in behind it as well.
     
    matt2 - amstereo, Jul 3, 2007
    #3
  4. Phil Allison Guest

    <>
    >
    > G'day. I have a small problem with my Samsung microwave where it
    > occasionally catches on fire. It last occurred when I was heating 2T
    > of margarine in a cup.



    ** That is an abuse of the oven.

    You must put a minimum quantity of food or liquid in a microwave oven -
    like a cup full or similar.

    Having very little or nothing results in excessive microwave voltage build
    up at the mouth of the feed horn into the oven - causing the arcing you
    see. Yep, that arc is 2.45 GHz RF energy.

    Certain Samsung models were particularly prone to such arcing and it can
    cause damage and the internal AC fuse to blow.

    Clean it up, retouch the paint and fit a new mica window if you like.

    Melt you 2T of marg in a cup by placing it in a saucepan of hot water next
    time.




    ........ Phil
     
    Phil Allison, Jul 4, 2007
    #4
  5. kreed Guest

    On Jul 4, 10:45 am, "Phil Allison" <> wrote:
    > <>
    >
    >
    >
    > > G'day. I have a small problem with my Samsung microwave where it
    > > occasionally catches on fire. It last occurred when I was heating 2T
    > > of margarine in a cup.

    >
    > ** That is an abuse of the oven.
    >
    > You must put a minimum quantity of food or liquid in a microwave oven -
    > like a cup full or similar.
    >
    > Having very little or nothing results in excessive microwave voltage build
    > up at the mouth of the feed horn into the oven - causing the arcing you
    > see. Yep, that arc is 2.45 GHz RF energy.
    >
    > Certain Samsung models were particularly prone to such arcing and it can
    > cause damage and the internal AC fuse to blow.
    >
    > Clean it up, retouch the paint and fit a new mica window if you like.
    >
    > Melt you 2T of marg in a cup by placing it in a saucepan of hot water next
    > time.
    >

    Or leave a small bowl/cup of water in there, especially if you often
    heat up really small amounts of food like this.
    Also handy in case the unit gets accidentally turned on with nothing
    in there.

    > ....... Phil
     
    kreed, Jul 4, 2007
    #5
  6. Two Bob Guest

    > Melt you 2T of marg in a cup by placing it in a saucepan of hot water next
    > time.


    Hey Phil, have you got a recipe for muffins??
     
    Two Bob, Jul 4, 2007
    #6
  7. I have a recipe for disaster?


    "Two Bob" <> wrote in message
    news:468b875d$...
    >> Melt you 2T of marg in a cup by placing it in a saucepan of hot water
    >> next time.

    >
    > Hey Phil, have you got a recipe for muffins??
    >
    >
     
    princo coasters, Jul 20, 2007
    #7
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