Re: Profile Drive issues (of course)

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

>Would it be a brake issue if the ProFile self-checks? It seems to
>do this successfully at almost every switch on. The stepper lever
>moves right around quickly (to track zero?) then moves smoothy step
>by step back to it's resting position.
...
>The unit hasn't booted again successfully despite numerous attempts.
>The Lisa recoginises there is a ProFile attached as I can see it as
>an icon.
...
>The ProFile sounds like it's trying to access the drive. Lights
>blink and the stepper lever sits at it's resting position and
>vibrates (buzzes)

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