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Microwave keeps losing power

Discussion in 'Electronic Repair' started by Mike S., Feb 7, 2007.

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  1. Mike S.

    Mike S. Guest

    Recently, I've been having problems with my microwave. It's about 7-8
    years old and is plugged into a grounded 3 prong outlet. The problem
    is that when I go to hit the start button, it cuts off and on very
    quickly (loses power). I can tell that's what happened because the
    clock resets. Other than that, it works fine.

    When this problem happens, there doesn't seem to be any other
    electrical equipment running that would cause a problem. It's just
    typical stuff like a tv, refrigerator, and the heat. I suppose the
    heat cutting on and off could cause it but it's hard to tell. This
    doesn't happen often and usually happens when someone hits the start
    button. Sometimes it will happen several times in a row.

    Does anyone have any ideas what could cause this problem?
  2. Eeyore

    Eeyore Guest

    I'm guessing but it sounds like the power supply is knackered. It may need a new
    storage capacitor.

  3. James Sweet

    James Sweet Guest

    Sounds like you have a high resistance connection somewhere, I'd start
    by checking the fuse holder and door interlock switches. Something is
    probably arcing when the high load of the power transformer kicks in.
  4. Meat Plow

    Meat Plow Guest

    Plug it into a different outlet.
  5. default

    default Guest

    I'd switch outlets first. Start current is high and if your house is
    wired with the push-in "fast and easy" receptacles they will often die
    under high current. The screw connections on receptacles make a much
    better connection for high current.

    Next idea would be to take it apart and look inside. They use push on
    fast connects and those things can fail. Aside from obvious charred
    wire, check each one and pull them off (after unplugging the uW and
    discharging the cap - with an insulated screwdriver!). If one is a
    different color than the others it could indicate it is running hot
    with a poor connection.

    Check the interlock system as well. It wouldn't seem like an
    interlock could cause the clock to reset but it can when rapidly
    pulsing the load.

    Brown-out can cause it - but you'd see the lights on that circuit
    flicker when the uW starts.

    Then it is on to the components - but more likely just a bad
    connection somewhere in the primary power circuits.
  6. Get a qualified tech to repair it. I'd check the door switches first. Note
    that these will KILL you faster than anything else you might try to repair.
  7. Terry

    Terry Guest

    After 8 years it really is time to buy a new one.
    You have had your monies worth

  8. Eeyore

    Eeyore Guest

    Ah, the throwaway society. Such a fine thing.

  9. I have a 20 year old one that works fine.
  10. Here's how you use a microwave stupid, you enter the time, usually
    printed on the TV dinner carton, and then you press start.
    Just user error
    Yeah, like I said, you have to put in the time then press start,
    Taylar's ****.

    What the **** do you think those numbers on the keypad are for making
    phone calls?
  11. Of course, Sony doesn't make microwave ovens, fuckhead!!!
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