Question about Whirlpool Microwave Ovens

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After repairing one of the door hooks on my Microwave oven MT 44-1 (or? MT 744/1/BL??), the oven went "dead". When connecting the electricity no signs of life where detected. I switch the fuse under the oven cover without getting it work.

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  • hakan_lundbo Dec 14, 2009

    Hello Asnowman.
    Unfortunately I did not find any resetable fuses under the cover. One reason could be that I wrote you the wrong mod.nr. The right mod nr: should be MT 244/WH (Whirlpool). The problem with a dead microwave oven remains, but I look forward to a solution proposal.
    BR Håkan

  • hakan_lundbo Dec 14, 2009

    Hello Asnowman.
    Unfortunately I did not find any resetable fuses under the cover. One reason could be that I wrote you the wrong mod.nr. The right mod nr: should be MT 244/WH (Whirlpool). The problem with a dead microwave oven remains, but I look forward to a solution proposal.
    BR Håkan

  • hakan_lundbo Dec 15, 2009

    I did measure the voltage at the door hook locker ( or what it is called?) unit connections and finded out that there was power there. What is a DMM?
    By dead I mean that there is no lights shining when connecting the power cable to the wall socket. And nothing happens when pushing any button at all. As far as I know the power is making out of the transformer. How do I check the magnatron, diode and the big cap, and where can i find the big cap?
    BR Håkan

  • hakan_lundbo Dec 16, 2009

    OK!
    I probably not have the time to check thoses things until after christmas. As you understood I do have a CMM.
    Do you have a "Exploded view" concerning this oven model? (MT 244/WH). I have one concerning MT 744/1/BL. Do you know if there is a big difference?
    /Håkan

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Helllo, asnowman here, please let me know what you have found when you removed the outer cover.
Thanks

Posted on Dec 10, 2009

  • 3 more comments 
  • John Snow
    John Snow Dec 14, 2009

    After you have removed the cover you will need to check for several things. If you have a DMM, check to see if the power is making out of the transformer. Any voltages that you find will be a good indication. Let me ask further, by DEAD you meen that there is no indication of power at all.

    Please let me know how far you are able to get.

    While you are inside and power is removed, you can try to check the Diode and the big Cap and the magnatron.

    Thanks

    asnowman

  • John Snow
    John Snow Dec 16, 2009

    DMM is a Digital Multi-Meter or Volt meter. You should be able to check the large capacitor it is a large silver oval or round device that has the large wires hooked to it. The Cap should not measure zero ohms, the Magnatron is the large device hooked to the cap with fins on it and it should measure open or infinity ohms. The diode should be checked with the diode selection on your meter and should not read 0 ohms in both directions. My concern is that you should have some kind of power past the main fuse, because none of these devices can keep the unit from powering on. If you have no display your main board may be out and that would be a very expensive repair, over $120.00 by my last estimate, in that case it would be more effective to replace the unit than repair.

    let me know how it goes.

    asnowman

  • John Snow
    John Snow Dec 16, 2009

    I do not have an exploded veiw of this model.

  • John Snow
    John Snow Dec 29, 2009

    Have you had time to check this out?

    Why such a low rating on an issue that is ongoing?

  • John Snow
    John Snow Jan 28, 2010

    Any progress on this after Chirstmas?

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If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor. How to test a high-voltage capacitor.

If it went dead several seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker (or GFI) when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount. My door switch help file.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

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If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

FixYa does not directly notify us experts of responses, so if you have other questions, please contact me directly.

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pupista@gmail.com
http://www.microwavecontrol.com
Microwave Oven Control Panel Repair Nationwide
"Recycling by repairing since 1982"

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If your microwave oven doesn't seem to work at all, check these: Fuses Usually, when your microwave oven doesn't work it all, the internal fuse (thermal fuse) is blown. This fuse protects both you and the oven. When it blows, you need to have a qualified appliance repair technician replace it.

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The hooklike projecitons on the door (called the latch heads) are held secure by the door hook so the switches are activated properly.

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If you or a friend decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

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