Re: Profile Drive issues (of course)

Thanks James,

Yes that crossed my mind also. Reseating those ICs on the controller board was one of the first things I did. The Profile is in remarkably good physical condition for it's age. It's obviously been well cared for and stored in a dry environment. There are few signs of corroded "black-leg": chips. I've certainly seen a few of these in my other classic computers when repairing them.

Terry (Tez)

On Mon, Jan 23, 2012 at 9:13 AM, James MacPhail <gg__at_email.domain.hidden>wrote:

>
> My experience with these kinds of symptoms is that it is a marginal
> ProFile Controller Board IC socket contact. This would explain such things
> as the controller sometimes finds the HDA in working order, but cannot
> communicate with the Lisa, and why the self-test sometimes works and
> sometimes doesn't.
>
> The usual fix is to extract each IC a little (pry up each end, say 2 mm),
> then push back into place. If that doesn't fix it, pry up each end slightly
> and try that (without pushing them back in).
>
> I have also seen ProFile Controllers with substantially corroded chips...
> very dark legs. Pulling out the worst ones and cleaning the legs back to
> shiny silver with a pencil eraser can fix those (but do one chip at a time
> to make sure you get it back in the right place, and triple-check they are
> all inserted the correct way around before turning the power on). The legs
> are fragile of course, so you clean them lengthwise while supporting them
> so they don't bend.
>
> Sometimes removing and re-inserting each chip a few times is enough to
> clean the contacts. You might try that before using the pencil eraser.
>
> Good luck!
>
> James
>

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