AlphaServer 4100 CPU fan
binarydinosaurs at gmail.com
Mon Jul 20 10:31:58 CDT 2015
>Do the original fans have speed sensors? There were several different
versions of this. Some fans have an OK signal, some give a pulse once per
rev. Did the original fans have 3 wires?
Yes, I put them down as +12V, GND, Pulse.
Original fan: http://f0p.co.uk/AS4100original.JPG
I'm guessing the original was slightly more 'special' than the replacement
which is just a cooling fan...
On 20 July 2015 at 16:17, Jon Elson <elson at pico-systems.com> wrote:
> On 07/20/2015 09:23 AM, Adrian Graham wrote:
>> I didn't realise there'd been a clasiccmp server meltdown, wondered why I
>> wasn't getting mails :)
>> We still have a few AS4100s out there in the field and CPU fans are
>> becoming scarce, so being canny we sourced some *almost* identical
>> replacements to no avail.
>> Original spec for the fan is 12V 0.17A, our replacements are 12V 0.18A and
>> the console still reports them as failed. I've sanity checked by using a
>> processor board with a good fan and still nothing. Could the 0.01A cause
>> THAT much of an issue? The wiring is a good 3" longer too but I didn't
>> think that would cause problems either.
>> Do the original fans have speed sensors? There were several different
> versions of this. Some fans have an OK signal, some give a pulse once per
> rev. Did the original fans have 3 wires?
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