Re: HELP Lisa dead 150W Power Supply

From: James MacPhail <uo957_at_email.domain.hidden>
Date: Fri, 28 Dec 2001 13:43:50 -0800

Tom wrote:

>the server of applefritter was broken down, I'll try later
>again. Hope this schematic is the one of the 1,8 A power supply; seems to me
>that there are schematics which are really different from the real
>power-supply all over the web, and nobody cares; or nobody seems to repair
>the 1,8 A supply!

The 1.2 A and 1.8 A power supplies are very different as you say. I believe the 1.8 A one was supplied to Apple under contract, hence no schematic 'leaked' from Apple.

"Usually" the failure of a Lisa power supply is typical of a switching power supply. (Leaking high voltage capacitors, blown flyback transistor, fried rectifier diode...) so it usually doesn't require a schematic to fix. I suppose there are plenty other failures that cause the power supply to be forgotten on a shelf awaiting repair, I think I have a couple of those.

If anyone does find a schematic for this power supply, please let us all know, I suspect many of us care.

Otherwise, perhaps someone can volunteer to draw it? (Or even volunteer some funds to commission it)

To start, I would suggest Capilano DesignWorks... the lite version is $40, free demo.



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        <>

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Received on 2001-12-28 13:54:46

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