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Circuit Board Carbon Arc

Discussion in 'Electronic Repair' started by Chris, Nov 4, 2009.

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  1. Chris

    Chris Guest

    I have a 55 year old door chime clock and the board has carbon arcs which is
    causing a short. I have seen boards with this problem before and they were
    repaired using some type of filler. What is used?

    Thank you for your help

  2. Bob Larter

    Bob Larter Guest

    I'd scrub the board with alcohol & a toothbrush, then spray it with a
    conformal coating. I can't think of any brandnames off the top of my
    head, but I'm sure that many people here will have suggestions.
  3. baron

    baron Guest

    Meat Plow Inscribed thus:
    From the open contact points spark/arc. Though I would have thought
    that it could be cleaned off.
  4. PeterD

    PeterD Guest

    This doesn't sound right, you can't arc with 24 volts. But, if it fact
    it has happened, I'd recommend using a dremel to grind out the bad
    parts of the board, and spray with a insulating coating, or even
    fingernail polish.
  5. Chris

    Chris Guest

    The carbon builds up then it arcs across. If you are thinking that low
    voltage will not arc, you are mistaken. Take a 9volt battery and put steel
    wool across both contacts. It will cause a fire. My kids use to love doing
    this at the kitchen table when they were young.

  6. Chris

    Chris Guest

    You can arc with 24 volts. That is like saying a car battery will not arc.
    It happens quite often.

  7. GregS

    GregS Guest

    I scrape out the black manually or with a Dremel tool.
    I then coat the bad part with nail polish with a couple coats.
    You could use epoxy if there needs more support.
    Mesure the resistance across the arc points to
    get an idea of the problem first.

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