6488Re: Vexing LS1 hardware issue
- Jun 28, 2008I had a problem changing the fan in my LS1. It turned out the problem
was using a two pin fan. You must use a three pin fan, and ensure that
it is properly connected.
--- In LinkStation_General@yahoogroups.com, Christopher Eykamp
> Thanks to everyone who has responded so far to my overheating problem.
> I say overheating because I am prepared to declare that is what the
> problem is. I again disassembled the unit and confirmed that I could
> run it for several days without issue. Then I turned it off, and
> sit for 12 hours in a cool room (c. 20C). I reassembled the unit,and
> checking carefully for any loose wires or cracks or anything else that
> might cause the system to fail when it was in a different physical
> configuration (and found no clues there). The reassembled unit ran for
> c. 18 mins under heavy load, then failed. I let it sit for about 1/2
> hour, removed the gray "sheathing" to expose some holes in the case,
> aimed a room fan on the unit. I could not make it fail again. Heat isand it
> almost certainly the culprit.
> James: I did indeed replace the hard drive some time ago with one that
> may well run hotter. However, I have kept the unit in a hot room
> ran without fail for months. It was only when I replaced the fan thatconstruction
> the failures started. I noticed you mentioned that the 5CFM fan is a
> "reduction". Do you have any idea what the original fan is rated for?
> I may need to replace the fan again with a more powerful unit.
> Alternatively, perhaps I can find a way to augment the cooling, perhaps
> by installing some sort of a heat sink. Unfortunately, the
> of the unit makes that challenging. Has anyone found alternative ways
> to cool their Linkstations?
> James Stewart wrote:
> > --- In LinkStation_General@yahoogroups.com
> > <mailto:LinkStation_General%40yahoogroups.com>, Christopher Eykamp
> > <chris@> wrote:
> > > This would seem to indicate a heat issue, though I'm not sure enough
> > > heat can build up in just 10 seconds to shut the machine down.
> > That depends on if you let the unit completely cool off before
> > restarting it. With a quick restart, the unit is probably still at an
> > elevated temperature and the heavy load of booting could quickly get
> > it past the limit.
> > I'm a little concerned why your unit would then be so sensitive to
> > overheating that the reduction to a 5CFM fan would cause a problem.
> > Did you install a new hard drive that runs hotter much hotter (and
> > takes more power from the power supply) than the old one. My LS-1 had
> > a low-performing Samsung drive in it which ran quite cool and didn't
> > take much power. I had to search around quite a bit to find a drive
> > that had comparable low heat and power requirements. I finally ended
> > up with a single-platter 160-Gig Seagate. Granted this wasn't much of
> > an upgrade over the 120-Gig Samsung, but I thought the Samsung was
> > getting tired after running for a few years.
> > I know people successfully put in bigger, more power consuming drives,
> > but I'm just being a long-term reliability nut with my LS.
> > It is also possible that since the your LS-1 is probably getting a
> > little old, the power supply might be getting weak as well, thus
> > starting to drop out of regulation under heavy load. Perhaps you
> > could monitor the voltage, preferably with an oscilloscope, worse case
> > just replace the smaller sized (thus used at higher frequencies)
> > electrolytic capacitors in the power supply. Make sure you use high
> > quality 105-degree(F) ones designed for switch-mode power supply
> > applications.
> > Finally, maybe it is a mechanical connection problem with your LS-1.
> > For example, maybe when assembled there is different stress on the
> > circuit board that could be causing a marginal solder connection to
> > fail slightly?
> > Good luck with this one. It would be good to run some more tests to
> > determine if it is really heat related or not. Try running the unit
> > in your refrigerator!
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