Notes on repairing the Apple Lisa power supply

From: R. D. Davis <rdd_at_smart.net>
Date: Thu May 25 18:12:49 2000

On Thu, 25 May 2000, Joe wrote:
> No, I didn't since I took it out of a working machine. I don't mean WAS

What's that got to do with the price of tea in China?

> working, I mean one that I have been using and that I tested less than five
> minutes before pulling the PS.

Yes, and a CP/M system that I carted home from across the street about
13 years ago was working minutes before I plugged it in. A piece of
solder shifted, and a tantalum capacitor burst into an orange ball of
flame. That's why I'm careful now about such things; I've seen them
happen, learned from my mistake, and try to help others learn from it
as well.

> If you
> >don't know what a short circuit is, just ask, or experiment... e.g.,
>
> Thanks but I've seen plenty of them.

Very well then, just trying to he helpful.

> >They why did you risk swapping in another un-tested, even though
> >thought to be good, PSU, and risk additional damage to the boards?
>
> Yes, you'd better have your eyes checked! I said KNOWN good power supply.
> You even quoted me above.

You had no way to know it was good without testing it, and since you
had to move it, it could have developed problems as I mentioned.

> I tested BOTH power supplies as best as possible before swapping them.

Yes, just not properly.

> >Hmmm... have you considered computer preservation as a hobby instead
> >of computer demolition?
>
> Have you considered minding your own business and not putting words in
> other people's mouths?

I expressed an opinion; if you have a problem with that, all I can say
is that your problems are not necessarily germane and are better
discussed between you and your fleas. :-)

> I knew what I was doing. Shouldn't you find out what you're talking
> about before you start shooting your mouth off? I don't know what kind of
> hair you have up your ass but I just e-mailed you and offered you some of
> the DEC 11/44 stuff that you were looking for. Now you can forget that!

No problem. Have a nice evening. Perhaps someone will trade you some
soap to wash your mouth out with for that stuff.

--
R. D. Davis                  
rdd_at_perqlogic.com            
http://www.perqlogic.com/rdd 
410-744-4900                 
Received on Thu May 25 2000 - 18:12:49 BST

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