On 18/11/11 13:29, hvlems at zonnet.nl wrote: Fred, DEC tends over-engineer things so possibly one fan may work provided the box is not loaded with disks. The VS4k series were designed for 5400 rpm disks and not for 7200 rpm or faster running disks. My solution would be to put storage in an external cabinet. You could try and apply e little graphite powder in the noisy fan bearing, better yet use a molybdenium based lubricant: these do not conduct electricity. I haven't opened my VS4000-x0's for year and cannot recall what the powersupplies look like, sorry. Hans ------Origineel bericht------ Van: Fred Afzender: owner-hecnet at Update.UU.SE Aan: hecnet at Update.UU.SE Beantwoorden: hecnet at Update.UU.SE Onderwerp: [HECnet] VAXStation 4000/90A power supply fan Verzonden: 18 november 2011 14:13 Good morning ... Subject mostly says it all. One of the fans in my VS4K 90A is noisy. I'd like to replace it. (actually both) Two questions arise: How the **** do I get the fans out of the power supply? I've got the power supply out (that's easy), mostly apart (that's not so easy) but do not seem to see any screws on the fans. Would it be safe to run it with just one (quiet) fan? Any pointers or links would be appreciated. Thanks, Fred ---- Lets call it for what it is - "legacy" is a term that people use in a polite but derogatory manner to imply that the future direction they prefer is not that which they view as the current direction. I'd caution against running it with one fan - I think the point of having two is in case one fails, and like hard drives it does occasionally happen. Regards, Mark.