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Taking apart an OLD microwave ove

Discussion in 'Electrical Engineering' started by John Gilmer, Nov 21, 2005.

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  1. John Gilmer

    John Gilmer Guest

    I had a old microwave over which I picked up at Monkey Wards (now out of
    business) back in 1977/78. It just kept on running and running and
    running. The "touch" keypad was difficult to operate and it was clear that
    it wasn't quite as powerful as it was but it was there.

    Last week, it stopped. We had already planned on replacing it with an over
    the over model (more about that in another post) so I wasn't upset.

    I decided to take it apart "just to see."

    Some comments on what I found:

    1) That thing was SOLID! It was really, really well put together.

    2) It had two (2), two pole (plus pilot) contactors. One was for the
    "browning" element. The other was for fail safe purposes. The final
    switching to the transformer was by some kind of triac (there was a diagram
    showing all the power and contactor wiring -- the "logic" just showed the
    120 volt and "safety" and sensor interfaces).

    3) When I had opened things up, I almost wished I had been a little more
    careful (because of dirt, I ended up bending the outer sheet metal to get it
    off). Turns out the Triac (or whatever) had broken off from it's heat
    sink. Without the heatsink, it failed (the proof was that the wiring to
    the triac showed some heat damage to the insulation. I was almost tempted
    to get another triac and put the thing back together.

    I "salvaged" a bunch of stuff like:

    1) The control panel -- it's powered from 120 volts. I might be able to
    find some use for it. My older girl said she might enjoy having it so I
    might find some way of getting it powered and not be a shock hazard to her.

    2) The contactors (both nameplated for 15 amps.

    3) The MAIN transformer, high voltage diode, and voltage doubling

    4) The magnitron tube (still has the heat sink but I want to see
    how they focused the magnetic.

    5) The permanent magnets (two flat "donuts". The magnetic
    circuit was completed by some heavy gauge sheet steel. I might keep them
    and play with the effects on conductors dropped between the poles.

    6) Some power hardware including a combo fuse block and male "slip on"
    terminal block.

    7) The MANY microswitches (safety, door switch, temperature probe

    8) The overheat sensor on the microwave cooling fins (NC).

    9) The thermal fuse that detected whether the contents of the over
    were on fire!

    10) The 50 rpm "stirrer motor"

    11) The cooling fan.

    For now, I will just move the stuff to a "junk box."

    If anyone has any projects to suggest, let me know.

    Anyway, I figured some of your would be amused by the whole thing.
  2. Kirk Johnson

    Kirk Johnson Guest

    Take it to the dump or just dump it on the side of the road somewhere.

    Kirk Johnson - "Stretchin it to the max since 1977."
  3. ehsjr

    ehsjr Guest

    The transformer is a nice hunk of iron for when you want to
    wind your own transformer. Many microwave transformers
    have one side intentionally shorted to ground, so be aware
    of that if you intend to use it unmodified.

  4. Rich256

    Rich256 Guest

    I too have a "junk box" full of similar parts. Never know when you might
    have a use for them. If you are into Ham radio it seems that there is
    always something coming up that needs a part your just threw away.

    A friend had a microwave that was arcing. He bought a new one and was
    throwing out the old one. Out of curiousity I took it home to see what it
    might be. When I opened it up I found a fried moth in the waveguide.
    Cleaned it out, put the oven back together and it worked like new.
  5. Kirk Johnson

    Kirk Johnson Guest

    I do it with all my old TV's, Fridges Etc. They only usually sit there for
    a few weeks, then someone comes and cleans them up.

    What's wrong with that ?

    Kirk Johnson - "Stretchin it to the max since 1977."
  6. Rich256

    Rich256 Guest

    Geeze, I spelt it all rite. Pretty good for an Enginneer.
  7. Kirk Johnson

    Kirk Johnson Guest

    I don't live in a state. Maybe you are the retarded one to place
    a post thinking that everyone lives in the same country as Yourself.

    FWIW it was a troll post trying to put across the amount of
    TV's & other consumables electrical items that are just dumped
    in my country.

    Gonna bite again ?

    Kirk Johnson - "Stretchin it to the max since 1977."
  8. Ben Miller

    Ben Miller Guest


    Be careful with that transformer. Several amps at 2-3kV is potentially

    Ben Miller
  9. Aratzio

    Aratzio Guest

    Hiya, NumbYa!
    Sew how due won become an expert in total retardedness? I am sure your
    expertise in being an expert on everything will give you special
    insight into total retardedness.

    Oh and while you are at it genius boi:
    :Meaning of RETARDEDNESS
    :No matching definitions were found in

    What exactly does that word mean? I looked in several dictionaries,
    hard bound and online and none of them could provide me with insight
    as to what you meant to write. You being a self described genius I
    cannot imagine you would just make up words and then try to use these
    faux words as insults.
    Nice froth, NumbYa but you can do better. Now wipe off the monitor and
    try again.
    My, my, for a urinal cake cleaner you do have delusions of grandeur.
    More retarded than someone that attempts to control all conversation
    and cross posts to an alt newsgroup?
    How ironic.
    Classic invective, as expected from someone who lacks a logical

    Classic unsubstantiated and erroneous claim.
    Non sequitur.


    Pierre Salinger Hook, Line & Sinker - May, 2005

    Hammer of Thor - July, 2005

    David Formosa (aka ? the Platypus) on 10-22-2005
    Message-Id: <>

    "But it is not isolated AUK has a massive impact the rest of usenet."
  10. Kirk Johnson

    Kirk Johnson Guest

    Nipple Tweek!

    Kirk Johnson - "Stretchin it to the max since 1977."
  11. Kirk Johnson

    Kirk Johnson Guest

    are you into ladyboys nunn ?

  12. John Gilmer

    John Gilmer Guest


    The cap (used in the voltage doubler) is reated for 1400 VAC!
  13. X-No-Archive: YES
    NunYa Bidness has offered into testimony

    What an intellectual exchange you have chosen to join. This explains why
    your worthless E-1 ass can't stay out of the brig long enough to mop out the


    Skepticult® Member# 581-00504-208
    ChadwickStone at Gmail dot com
    Usenet's most helpful netizen
    Hammer of Thor, March 2005
  14. Roy Q.T.

    Roy Q.T. Guest

    Schhhhht much statik

    can any read me ////??? is this radio picking up my speech... dangit !

    copy dat....

    [Title] / an enclose the magnetrons magnetic output throu a torroid n
    to yor New stereo and when it acts up increase the Vol and draw it with
    the Bass & Treble control atached to the torroyd,and Welcome 2 the Idiot

    Dahhh wat r we takin it apart again 4

    Roy's Injun cuzin Joseph from the plains jackt his internetface
    box.idid. just to tell ya how we donit. okay

    C:-o Joe

    Out !
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