Alpha 4100 CPU fan

Jon Elson jonelson126 at
Wed Jun 10 17:20:46 CDT 2015

On 06/10/2015 01:13 PM, Richard Loken wrote:
> On Tue, 9 Jun 2015, Adrian Graham wrote:
>> Trying to source a non-DEC fan for a 4100 CPU since getting them in the UK
>> is more and more tricky as time goes on. The originals are 12V 0.17A 60mm
>> 3-wire and I've found some almost-identical-but-not-quite 0.18A variants.
>> Needed to rewire the plugs to match (12V, sense, gnd) but the machine
>> reports 'CPU0 Fan Fail' despite the fact the fan is running at speed.
> I too found I could not find a sufficiently similar fan to run in a 4100
> without being seen as a fan failure so I ended up rebuilding them.  These
> are fans have replaceable bearings so I took mine apart, measured the
> bearings with calipers, and purchased a dozen replacements from a random
> web bearing supplier.  That was three or four years ago, if I hunt very
> hard then I might the name of the vendor and the part number but right
> now my basement office is in boxes as we clean up renovate after a burst
> water pipe.
Boca Bearings has just about any bearing you could want.  I've rebuilt 
some noisy Dell computer fans with their bearings.


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