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  • Re: Magic smoke!

    From Leon@nobody@nobody.com to comp.sys.apple2 on Fri Sep 12 05:17:18 2025
    From Newsgroup: comp.sys.apple2

    "scott@alfter.diespammersdie.us" wrote:

    2) Really old devices (mostly running on vacuum tubes instead of
    solid-state
    devices) that used wax- or plastic-covered paper capacitors in which
    failure of the wax covering would cause the paper dielectric to
    absorb
    moisture, altering its properties.

    About a year later... Learned something interesting today..

    Leon
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  • From phigan@wwiv@bbs.penisys.online to comp.sys.apple2 on Mon Feb 24 00:18:03 2025
    From Newsgroup: comp.sys.apple2

    On 2024-09-04, Michael J Mahon <mjmahon@aol.com> wrote:
    D Finnigan <dog_cow@macgui.com> wrote:
    phigan wrote:
    Are there some known people or places that one can send Apple2 and
    classic Macintosh units to for re-capping?

    The combination of these ingredients has led to an almost superstitious tendency to ???replace ???em all???. This is almost never necessary, and often
    results in needless damage.

    Unfortunately, the Mac LCIII that I would like to get working again most definitely has capacitor issues as you can visibly see leakage around
    several of them on the board. Unfortunately I don't know if there are
    any further issues yet.

    The other unit that I would like to get working is a IIgs. Right now
    when powered on it only shows thick horizontal black and white bars on
    the screen. I'm thinking it's most likely some of the onboard RAM that
    is the culprit (ROM3), but there may also be a sign of a leaked cap or
    two in that one as well.
    Unfortunately, the Mac LCIII that I would like to get working again most definitely has capacitor issues as you can visibly see leakage around
    several of them on the board. Unfortunately I don't know if there are
    any further issues yet.

    Perhaps I should have said "for fixing" rather than "for re-capping". ;)
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  • From Andrew Roughan@no_email@invalid.invalid to comp.sys.apple2 on Mon Feb 24 12:33:46 2025
    From Newsgroup: comp.sys.apple2

    phigan <wwiv@bbs.penisys.online> wrote:

    The other unit that I would like to get working is a IIgs. Right now
    when powered on it only shows thick horizontal black and white bars on
    the screen. I'm thinking it's most likely some of the onboard RAM that
    is the culprit (ROM3), but there may also be a sign of a leaked cap or
    two in that one as well.

    Did you mean vertical columns of white and black?
    This is usually a sign that the CPU has not kicked in. Has this machine had
    an accelerator in the past? Perhaps the cpu socket is not making good
    contact with the cpu.
    I have not heard of many people having issues with the IIgs capacitors.
    They are not surface mounted and therefore avoided the bad caps plague.
    Regards
    Andrew



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