[HECnet] VAXStation 4000/90A power supply fan

[hvlems at zonnet.nl]

I don't own a -90 so can't confirm that.

From: Saku Set  l   <setala at gmail.com>
Sender: owner-hecnet at Update.UU.SE
Date: Tue, 22 Nov 2011 13:11:48 +0200
To: <hecnet at update.uu.se>
ReplyTo: hecnet at Update.UU.SE
Subject: Re: [HECnet] VAXStation 4000/90A power supply fan

Do the 90 and 90A have same PSU?

On Sun, Nov 20, 2011 at 21:19, <hvlems at zonnet.nl> wrote:
No choice but to drill it out. Unless you'd rather buy another p/s.
Hans
-----Original Message-----
From: Fred <fcoffey at misernet.net>
Sender: owner-hecnet at Update.UU.SE
Date: Sun, 20 Nov 2011 14:08:23
To: <hecnet at Update.UU.SE>
Reply-To: hecnet at Update.UU.SESubject: Re: [HECnet] VAXStation 4000/90A power supply fan

> 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

----
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.