Hamilton 505 Short Circuit

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  1. #1
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    Hamilton 505 Short Circuit

    In an effort to restore the contact (D-pin) with some silver conductive glue, I got some on the staff and it's shorting to the gold thingy the contact is attached to.
    Any ideas to get the silver stuff off, or should I start hunting for new balance assemblies?

    (Also, I'm new here; is this the correct place for this kind of thing?)

  2. #2
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    Re: Hamilton 505 Short Circuit

    Update: tried some acetone as suggested on an electronics forum. Balance tests good out of movement and when initially installed, but starts shorting again after a few oscillations. My guess is that the acetone ate some of the wire insulation, but it looks perfectly fine under a microscope. I'm going mad here.

  3. #3
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    Re: Hamilton 505 Short Circuit

    Also, it doesn't make sense to me that it starts shorting again after an impulse or two. Is it the overbank prevention thingy?

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  5. #4
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    Re: Hamilton 505 Short Circuit

    Update: Blance tests fine after a few swishes of the lower part in acetone and then a rinse, then tests fine when fully installed. Manually move the balance for several swings, still tests good. I gave it full power for one swing and it started shorting again as soon as the electromagnet activated. So there must be something magnetic that dislocates and causes a short... but I have no idea what that could be.

    Would demagnetizing just the balance mess anything up?

  6. #5
    Member odd_and_vintage_fan's Avatar
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    Re: Hamilton 505 Short Circuit

    Ok, I'm just a hobbyist, so no hard feelings if you tell me to butt out. My understanding was that the permanent magnets are in the mainplate and the balance in a Hamilton Electric is only magnetic when it has a charge.

    I'm assuming as part of your tests, you did the resistance through the coils.

    HAMILTON PACER 505 ELECTRIC 1959

    Looking at this, is it possible that the insulation between the contact and the balance had an issue? I don't know if you have the early or the later d-pin.

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