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Smell of burned capacitors...

Discussion in 'Electronic Repair' started by mc, Dec 29, 2005.

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  1. mc

    mc Guest

    I have a function generator that burned up a tantalum capacitor (which
    shorted) and a 2-watt resistor. Fixing it electrically was no problem, but
    there is a scorched place on the circuit board and a terrible smell.

    Today I made some progress against the smell. I had been airing the
    generator out, covers off, in my attic (which is not hot at this time of
    year), for about 3 days with little progress. Today I figured out that the
    bulk of the smell was actually in a large calibration-instructions chart
    that was glued to the inside of the case. I Xeroxed it and peeled off and
    discarded the original; much better. I've also given the whole circuit
    board a spraying with contact cleaner and then with isopropyl alcohol.

    Any other ideas? The smell was so strong that even with all the covers on
    the function generator, it was quite noticeable throughout the workshop.
     
  2. Charcoal briquettes in a closed container?
     
  3. TimPerry

    TimPerry Guest

    simple green or other mild detergent applied with toothbrush or paintbrush.
    rinse with clean water. air dry or gently apply heat gun or hair dryer.
     
  4. mc

    mc Guest

    Any other ideas? The smell was so strong that even with all the covers
    Maybe. I'm thinking of putting a drop of one-drop deodorizer on the inside
    of the case when I close it up.
     
  5. gb

    gb Guest

    Tim has the right idea. The Collins radio restorers swear by Simple Green
    for cleaning and restoration work.

    I am cleaning a receiver (previous 25 year owner was a smoker). After doing
    all of your steps with contact cleaner, Windex, isopropyl alcohol and
    distilled water in key areas .. it still had a slight odor.

    So, I tried Simple Green with cotton swabs and Q-tips. Brought up brown in
    areas that I had previously cleaned. Simple Green also has a slight
    pleasant odor. It's better -- but will take quite a bit of Q-tips and
    cleaning still !

    gb
     
  6. jakdedert

    jakdedert Guest

    I am on an aircraft listserv. The subject of Simple Green for cleaning
    airframes came up recently. Apparently, both the FAA and US Military
    have banned it for being corrosive to aluminum. The SG folks have
    released a new aviation formula specifically for the purpose.

    Might be worth keeping in mind....

    jak
     
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