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Re: Vexing LS1 hardware issue

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  • Paul Wright
    I 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
    Message 1 of 6 , Jun 28 8:51 AM
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      I 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.

      P

      --- In LinkStation_General@yahoogroups.com, Christopher Eykamp
      <chris@...> wrote:
      >
      > 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
      let it
      > sit for 12 hours in a cool room (c. 20C). I reassembled the unit,
      > 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,
      and
      > aimed a room fan on the unit. I could not make it fail again. Heat is
      > 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
      and it
      > ran without fail for months. It was only when I replaced the fan that
      > 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
      construction
      > of the unit makes that challenging. Has anyone found alternative ways
      > to cool their Linkstations?
      >
      > Thanks,
      >
      > Chris
      >
      > 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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