Re: Lisa won't stay off (was Lisa 2: Bad Disk Drive)

From: Jerome Vernet <vernet.jerome_at_email.domain.hidden>
Date: Sun, 13 Nov 2005 20:16:06 +0100

Thank you, I will try.

Jerome
Le 12 nov. 05, ˆ 00:33, James MacPhail a Žcrit :

>
> This was an aside to another problem, so it looks like it didn't get
> any
> attention:
>
>> when I switch the Lisa off, it goes off then on immediately.
>
> I have seen a couple of causes for this problem, ones that come to
> mind are:
>
> 1) Damaged (broken) traces on the I/O Board due to corrosion from
> leaking
> batteries.
>
> If your I/O Board once had batteries on it, check the continuity of the
> traces in that area carefully.
>
> If it still has batteries on it, you should probably remove them and
> clean
> the circuit board in that area before battery leakage causes (more)
> damage.
>
> The battery is not required for startup or operation of the Lisa; it is
> only to keep the clock running and preserve some preference settings in
> RAM. Unlike a modern computer whose clock can run from the battery for
> years with no external power, the Lisa battery only lasts for a few
> hours
> when external power is interrupted.
>
> 2) Bad COPS, or perhaps poor contact with its socket.
>
> It may be enough to remove and re-insert the COPS to improve the
> connection.
>
> If not, replace the COPS with one from another I/O board... if it still
> doesn't work, then it probably isn't the COPS.
>
> 3) A couple of other parts on the I/O board can fail causing this sort
> of
> problem, so if the above don't help, let us know and we can start
> trouble-shooting.
>
> Good luck!
>
> James
>
> James MacPhail "Think not of engineering as art,
> uo957_at_email.domain.hidden but of art as engineering"
> Sigma Seven Systems Ltd.
> james_at_email.domain.hidden <http://SigmaSevenSystems.com>
>
>
>
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Received on 2005-11-13 11:26:46