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
...._._

> 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.

symptoms sound a lot like those I had when the PS in my U1 died a few years
ago.

i would imagine if the problem was a short on the MB that the fuse in the PS
would
have been tripped.

U2 chassis are so cheap these days you could probably buy one from eBay for
less
than a new PS and scavenge the PS.

just me ten cents worth
AT

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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On Fri, 30 Jan 2004 09:28:18 -0600
"Mike Beckmann" <mbeckmann@ibmsystems.com> wrote:

> Will send you a whole base for $100

Thanks, but I got a PS off of Ebay for $32 post paid.

--
J'm

To Reply Direct, Remove Clothes
...._._