Jupiter 4 corrosion

[Hairy Harry]

Actually Capillary action will oppose gravity. It can raise liquids
by as much as several feet above the liquid level, depending on
capillary size, and viscosity of the liquid.

If the liquid will evaporate at the other end, the resulting force
(transpiration in plants...) can move the liquid hundreds of feet
opposing gravity.

OK... I guess "BBD's AND NiCad's Suck !!!" (lol)

H^) harry


>From: "Grant Richter" <grichter at execpc.com>
>To: macdonald at evenfall.com, Synth DIY <synth-diy at node12b53.a2000.nl>
>Subject: Re: Jupiter 4 corrosion
>Date: Thu, 05 Oct 2000 10:26:05 -0500
>
>This relates to the position the unit is stored in. If the faulty nicad
>secretes a corrosive liquid, capillary action will cause the liquid to
>follow the wire leads to the circuit board, unless gravity is opposing it.
>
>The Poly Six I have was stored vertically so when the battery leaked, the
>corrosive material fell harmlessly to the back of the metal case. I know
>this because of the corroded spot on the metal back. But the PCB traces are
>fine.
>
>From practical experience, store a Poly Six vertically with the keyboard 
>up.
>Perhaps other people have similar comments for different units.
>
>----------
> >From: Chris MacDonald <macdonald at evenfall.com>
> >To: Synth DIY <synth-diy at node12b53.a2000.nl>
> >Subject: Jupiter 4 corrosion
> >Date: Wed, Oct 4, 2000, 12:56 PM
> >
>
> > My Jupiter 4 had been sitting in the corner for more than a year and
> > this weekend I finally had a chance to set it up on a stand.
> > Unfortunately when I turned it on, no sound!  After poking around the
> > insides, I discovered that most chips on the motherboard were not
> > getting +15V.  The power supply was fine, and the power connector to the
> > motherboard had +15V.
> >
> > I removed the motherboard to examine it and discovered that there was a
> > localized area of corrosion on some traces around the connector to the
> > NiCad battery.  :(  The battery is mounted away from the board and is
> > connected to it by a set of wires that are several inches long.  I guess
> > corrosive effects can be transmitted through wire, so off-board mounting
> > is no guarantee.  The battery itself had telltale corrosion and "salt"
> > crusted around one end.
> >
> > I removed the battery and was able to run jumper wires to bypass the bad
> > traces but I wish I had caught it sooner.
> >
> > -Chris
> >

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