Re: Swapping Lisa components

From: James MacPhail <gg__at_email.domain.hidden>
Date: Thu, 19 Feb 2009 17:12:06 -0800

>If I were to swap components out with my working Lisas, is
>there a risk of frying something? For instance, if I put one of
>the power supplies from the dead Lisas into a live one to see if
>it works, and a good power supply into a dead one, or swapping
>CPU and memory boards between live and dead computers
>could I possibly fry working components?

It is conceivable, but I've never heard of it happening.

I'd go ahead and do it, but of course I don't accept responsibility for the results!

If you have a working 1.8 Amp PSU, I'd use that... it's more rugged than the 1.2 Amp version.

The clicking PSU is either a short circuit or its voltage set too high.

You could look for a short by opening the back and checking the resistance to ground for the various power supply output voltages accessible on the I/O board. If there is a short but you can't isolate it to one board in the card cage, then its probably inside the PSU.

HTH, James

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