Re: Dead Sun Ultra2 Question-->PS or something else?

From: Mike Beckmann (mbeckmann_at_ibmsystems.com)
Date: 01/30/04 

Date: Fri, 30 Jan 2004 09:28:18 -0600

Will send you a whole base for $100
"J'm Sm'th" <smith.house@sbcglobal.clothes.net> wrote in message
news:20040128220639.09da2144.smith.house@sbcglobal.clothes.net...
> My trusty Sun Ultra 2 croaked last night, quietly and without alarm. I
> noticed that the power was off, so I tried the power-on button the
> keyboard--no go. I tried the power switch on the back--the fans spun
> around about 3 revolutions [as though they got a small pulse of
> electricity], then nothing. This 3-rotation thing is repeatable.
>
> So, I began to unhook hardware--first the drives, then the CPU, then the
> frame buffer, all with the same result. Then I began unhooking the main
> power connectors to the mother board. With all the connectors unhooked,
> *nothing* happens [not even the 3-rotation thing] when the power button
> is hit.
>
> When I hook the MB connectors back up, the PS does the 3-rotation thing
> [the CPU fans do the same thing].
>
> So, my question is this: is it the PS, or could this be the MB that is
> the problem? If it is the PS, how can I be sure when I hook a new PS
> up, that there isn't some piece of hardware that will take down this PS
> as well?
>
> I took apart the PS [I am relative comfortable around electronics, being
> a ham], tested the fuse and it's ok. Not having a schematic, and not
> knowing all that much about switching power supplies, I don't know how
> to proceed.
>
> Any hints?
>
>
> --
> J'm Sm'th
>
> To Reply Direct, Remove Clothes
> ..._._

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