Re: Lisa repair questions

the cops chip is in the keyboard.

Rudolf Brandstötter 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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