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got any pictures it may be that the pads have carodid to the piont wher the metirial don;t conduct properley or it might be just that the surface is to uneaven to give good contact over the the pad. testing the curcuit by simply holding a wier over the connection in place of the rubber pad might help you determin of the pads non conductive any more but as Florain said it may be the associated diode thats faild. those diodes are very cheap parts to get.

I take it the board and rubber contacts have all been cleaned in the past

--- On Thu, 27/5/10, chad imes <likeandrot@...> wrote:

From: chad imes <likeandrot@...>
Subject: Re: [korg_mono-poly] ...and all of the sudden, no sound!
To: korg_mono-poly@yahoogroups.com
Date: Thursday, 27 May, 2010, 13:18

it's the PCB that's corroded somehow -like the previous owner spilt a soft drink on it or something

Soooo, is it possible to check these things using a DMM 0_o That's all I got.

thanks again,

chad

From: Florian Anwander <fanwander@mnet- online.de>
To: korg_mono-poly@ yahoogroups. com
Sent: Thu, May 27, 2010 8:39:38 PM
Subject: Re: [korg_mono-poly] ...and all of the sudden, no sound!

Hi Alan

> From your description it sounds like you filter chip SSM2044 may have
> gone.
first he should check whether there is a signal at pin 1 (input) of the
SSM2044
Also it is worth checking the four ICs 2033 at pin 8, 3 and 12 whether
there is a signal.

> mean it seems that the rubber contact has corroded or the PCB contact
> You night find the rubber strips on ebay. same type as in the polysix
> and another few keyboards. as for finding a complete keyboard PCB that
> might be more tricky.
check also http://www.oldcrows .net/~oldcrow/ synth/korg/ polysix/keyclean .html

If the contacts don't work ever, then maybe also some of the diodes in
the keyboard matrix might have died.

Florian

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573 Re: [korg_mono-poly] ...and all of the sudden, no sound!