Hi,
I have just purchased a second hand Prima 220 with a cooling fan that makes more noise than a 747!

The unit  appears to have a motherboard marked 611000 REV 4 and serial no of the unit 011231. The noise seems to be air movement rather than bearing noise.

My question is, can anything be done about this i.e. fitting a different fan or unplugging it! This noise affects where I can mount the unit in the control room. 

Any help would be appreciated.

John