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Subject: Re: [korgpolyex] Re: Dead 800

From: Michael Hawkins <korgpolyex800@...>
Date: 2009-02-24

Aaron,

you should check all voltage rails. especially +5 and -5 volt rails.

The power supply of the Poly is somewhat reliable. Note the "somewhat".

Sometimes it does fail or drift enough to cause Poly's to die.

If you don't have a display showing then tape and patches etc are 99 percent NOT going to work.

Even when memory is corrupted due to battery failure, those display's will at least show something.

Also, I would give the thing a complete internal thorough check out looking for battery acid damage, broken wires, misaligned or misplaced connectors etc.

Sometimes it's the simple things.

Mike.


From: selloutdesigns <aah_public@...>
To: korgpolyex@yahoogroups.com
Sent: Tuesday, February 24, 2009 9:48:45 AM
Subject: [korgpolyex] Re: Dead 800

I gave this a try on my dead Poly, but no luck. It seems that VR1
adjusts the +5V rail voltage and subsequently the supply voltage to
the CPU, but in my case it seems like all the chips are getting
adequate power.

<<aaRoN>>

--- In korgpolyex@yahoogro ups.com, Russ <russdaren@. ..> wrote:
>
> I had this problem a while ago and got her back upby fiddling with
one of the VR pots. Cant recal which one did it. But one of them
seemed to control voltage for the CPU board. It wnet from no display,
to garbled, to functioning just fine ever since.
>