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

[Greg Jurman]

On Mon, Nov 11, 2013 at 4:07 AM, Peter Stokes <peter at ashlyn.co.uk> wrote:
> Hi Greg
>
> Glad it was nothing too difficult to change if you wanted to, those chips
> should be available fairly easily I guess or at least an equivalent.
>
> Peter

Yup, I have a couple from Mouser on the way (TI Part Number:
SN74ACT04DR). It was very wise of Sun to put that sacrificial (though
not intentionally sacrificial) buffer there.

In other news, Solaris is very happy and no longer giving me grief
about the fans.

Thanks everyone!

Greg


>> On 11 Nov 2013, at 03:49, Greg Jurman <jurman.greg at gmail.com> wrote:
>>
>> 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!
>>
>> Greg
>>
>>> 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)
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