"Scratching out" the corrosion is a band aid fix. It *will* come back if not neutralized.
The battery leaks out an alkaline: Potassium Hydroxide. This is a
corrosive base, much like lye. The way to neutralize the leakage,
after removing the battery is to wash the affected area with a
solution containing a 50/50 mixture of (white) vinegar and pure water.
Scrub carefully with a good toothbrush, and then rinse with pure water
and dry with a hair dryer.
----- Original Message -----
From: gil_we
To: kawai_sx210@yahoogroups.com
Subject: [kawai_sx210] Re: still dead...
Date: Mon, 06 Jun 2005 17:10:40 -0000
You should scratch out the corrosion that lay over the traces and
remove the ICs at the corroded area, place sockets instead and wire
the bad traces. If problems still exist after doing that then
generally what I would suggest is also replacing ICs that connect
directly with the corroded ICs. BTW, take into account that even
after recovering the computer board, there might be other bad chips
that do not relate to the battery corrosion problem.
--- In kawai_sx210@yahoogroups.com, "Mark Daborn"
wrote:
> Oh well.
>
> I removed the battery and there was a fair amount of corrosion
there. Nothing had been eaten through but the tell-tale brown
discolouring was present. I had to wire-link several components just
to be on the safe side but the machine is still unwell.
>
> Poly8 mode produces the most sound although it is sporadic and most
of the keys dont seem to sound. Poly4 mode produces a high pitch
static sound like the filter on full resonance over any faint sound
that may be there. Mono mode now is just a shrill digital fuzz.
>
> Im beginning to suspect one or more IC's may be faulty but i don't
have a clue which ones.
>
> I think it maybe time to hand it over to a tech who knows what
he/she's doing!
>
> The only problem is, i don't know of any!!
>
> Anyway, thanks to everyone for the help. I just hope i can find
someone to get this thing working!!
--
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