Re: Lisa repair questions

I'd think the problem with the PSUs is not the temp sensor, but one of the capacitors or perhaps the dual diode. Those parts seem to fail with age more often.

-Jason

On Tue, Aug 9, 2011 at 6:38 PM, "Rudolf Brandstötter" < R.Brandstoetter_at_email.domain.hidden> wrote:

> Hello Lisa fellowers,
>
> I have some repair questions I nowhere found in the well known Lisa
> documentation... it may be also helpful for others.
>
> 1.) I have 2 1.8AMP power supplies that shut down after 5-10 minutes when
> they are warmed up. When they are warm the Lisa shuts down immediately; if
> you wait 1h or so it runs again for some minutes.
> I read in the owners guide that the PS has a temperature sensor that shuts
> down the PS if the temperature is over 90°centigrade. My question: where the
> hell can I find that sensor on the PS? Can you tell me the location? Any
> experiences with that part?
>
> 2.) One Lisa always shows error #52 when starting. The problem is that the
> COPS chip is not the problem (changed i/o, MB, CPU boards.. and everything
> with another working Lisa where this problem does not exist). I can only
> imagine that the cabels inside or the power on/off switch causes this
> problem. Any experiences with that sympthom?
>
> many thanks for any answers
>
> Rudi
>
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