[HECnet] VAXStation 4000/90A power supply fan

[Fred]

On 18/11/11 13:29, hvlems at zonnet.nl wrote:
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 tried some good old moly lubricant the guys use at the copier shop where I work - it made a slight difference but not much.   The bearing is obviously shot.   The fan is *riveted* into the power supply.   What the heck?

On Fri, 18 Nov 2011, Mark Wickens wrote:

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.

For now, I am running it with one fan, and it being only 60-65F in the house (and the computer office) the VAX is not running hot.   I removed one of the drives, since I really wasn't doing anything with it. (it was a pull from a BA356 canister)   Looked half-height to me, although I do have some smaller in size drives that I may swap in.

At some point I'm going to source new fans and then try to pry the old ones out.   Other than that when I had the power supply apart, no domed caps, everything is quite clean (and even cleaner when I gave it a date with the shop air compressor).

I have two 90's (not 90A's) in the closet I could press into service but I really do not want to trash this 90A for just missing one fan.

Thanks for the responses all.

Fred

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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.