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Circuit Board Arc Track Repair

Discussion in 'Electronic Basics' 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. Tom Biasi

    Tom Biasi Guest

    What is causing the arc?
    Your description of the problem is a little confusing.

  3. Chris

    Chris Guest

    Over time the carbon builds up and causes the arc which puts small
    gauge/hole in the board. This was a frequent problem of board of old. It
    does not happen that much on new boards since they are made of a different
    material now.

  4. Tom Biasi

    Tom Biasi Guest

    I agree with this procedure.

  5. Bob Eld

    Bob Eld Guest

    Drill out any carbonized areas to insure there are no carbon current paths
    shorting anything. Re-wire any lost clad with copper wire soldering it in
    place. There is usually no need to fill any voids unless there is an obvious
    loss of strength or rigidity of the board. If you must fill the board, bondo
    works well and is thick enough to stay in place while hardening. Some
    epoxies work well too but it is usually not necessary to re-fill drilled out
    areas. Air is actually a good insulator and provides longer creepage paths
    than any re-fill patch does.
  6. Clint Sharp

    Clint Sharp Guest

    Depends on the board type, if it's paxolin or some kind of resin bonded
    paper then just scrap/grind out the carbonised parts (dremel with a burr
    is ideal) then fill with the epoxy of your choice unless you're happy to
    leave it as is. The only problem with not filling is you may increase
    the moisture absorption of the board by exposing the edges, making
    further damage more likely, conformal coating would help.
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