[rescue] Sun E450 - 'CPU Fan 2 Failure' but not failed

Greg Jurman jurman.greg at gmail.com
Sun Nov 10 21:49:12 CST 2013

So, a successful update.

I disconnected and removed the main-board from the chassis and send a
1V at 1Khz square-wave through the rotor locked/alarm lines one at a
time. This allowed me to trace where the signal is going. They land at
a 74ACT04 Hex Inverter (its U4401 or U4601, I cant read the second
digit, silk-screen is too blurry) just below the DC-DC converters
(DC-B2 to be exact). One of the paths is a dead-open, and that is the
signal path for Fan 2.

I soldered a small bodge-wire between one of the working outputs and
the dead output temporarily to confirm that this is in-fact the
problem. I no longer have the Fan 2 failure.

Going to try Solaris again and give it a burn-in to make sure nothing
else is wrong with it.

So it was a board problem, at least it not with one of the actual ASICs!


On Sun, Nov 10, 2013 at 12:33 PM, Cory Smelosky <b4 at gewt.net> wrote:
> Sent from my iPhone
> On 10 Nov 2013, at 03:43, "Meelis Roos" <mroos at linux.ee> wrote:
>>> Speaking of firmware for older Sun gear, anyone have the latest OBP for an
>>> Ultra 60 laying around?
>> I downloaded all the PROMs before Sun was swallowed so I certainly have
>> them somewhere...
>> Is 106455-11  the one you are looking for?
> I think so, yes.
>> --
>> Meelis Roos (mroos at linux.ee)
>> _______________________________________________
>> rescue list - http://www.sunhelp.org/mailman/listinfo/rescue
> _______________________________________________
> rescue list - http://www.sunhelp.org/mailman/listinfo/rescue

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