Automatic power-down of PXI-1033 chassis. Noisy chassis fan.

I went to use my PXI chassis today. I always keep it powered, but today it wasn't on when I went to use it. Turns out that there's an automatic power down if the fan 'fails'. So I removed the chassis power, and then repowered the chassis. Heard a noisy fan - like one of the blades were hitting something solid. And I only heard something when the chassis was in the 'big fan down' orientation It was the big fan on the 'bottom' of the unit which cools the boards. To fix this, I removed the air filter, and then the wire screen, and then the wire fan protector. I rebent the 4 legs of the wire fan protector (be sure to rebend both elbows of each leg) so that it sits farther away from the fan blades. Put it back to gether, and now no sound.
Solved!
Go to Solution.

Apparently my PXI chassis is part of a 'fan replacement' recall.
See http://digital.ni.com/public.nsf/allkb/B9BB6E483EDB5353862578180081FA6A

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Automatic power-down of PXI-1033 chassis. Noisy chassis fan.

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