Alpha 4100 CPU fan

Adrian Graham binarydinosaurs at
Tue Jun 9 10:08:43 CDT 2015


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.

Is +0.01A enough to make the monitor board think the fan's failed? Board
itself is fine as it works with its existing fan.


Owner of Binary Dinosaurs, the UK's biggest home computer collection?

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