[vox-tech] power supply question

[Marc Hasbrouck]

Unless you're bad at soldering, replacing the fan can
be fairly easy. It does involve opening the power
supply and voiding the warranty. Is the p/s under
warranty?

Marc

--- Samuel Merritt <snmerritt@ucdavis.edu> wrote:
> On Fri, May 10, 2002 at 05:56:14PM -0700, Peter Jay
> Salzman wrote:
> > power supply fans generally stay on 24/7.  right?
> > 
> > i have a power supply fan which turns on for the
> first second or two of
> > powering up, then it comes to a stop (but in such
> a way that makes it
> > look like it wants to turn; it dances a bit).
> > 
> > if you leave it on for awhile, it'll start
> spinning again (with an
> > audible click.  sounds like a switch or relay) but
> only for a few
> > minutes.  it'll stop again.  and eventually start
> up again.
> > 
> > when you power the system off, it rotates a few
> times before coming to a
> > halt.
> > 
> > 
> > the fan rotates freely when the power is off.
> > 
> > any ideas?   (aside from buying a new supply).
> 
> Sounds to me like you have a variable-speed fan,
> probably 
> temperature-controlled, so that it tries to run as
> slowly as possible 
> while still keeping the power supply cool.
> 
> My guess is that the fan's bearings are starting to
> go out, so when it 
> tries to go at one of its slower speeds, you get the
> dancing. Then, the 
> power supply heats up, so it goes to a fast speed,
> and starts running 
> again, cools the supply, and we start the whole
> cycle over again. 
> 
> You can often replace just the power-supply fan
> without replacing the old 
> supply. They're standard 80mm fans; the only hassle
> might be cutting the 
> old power leads and soldering new ones on. 
> 
> -- 
> Samuel Merritt
> PGP key is at
> http://wwwcsif.cs.ucdavis.edu/~merritt/snmerritt.asc
> Information about PGP can be found at
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> 

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