Korg Mono/Poly

thanks Alan and Florian!

I'll take pictures of the PCB so you can see.  

One point I'm still not clear on is how I might test the output of the SSM 2044 and the 2033s.  Can that be done with a DMM or in another easy cheap way?

thank you very very much!!!

chad 



________________________________
From: Alan Dicker <alanmdicker@yahoo.co.uk>
To: korg_mono-poly@yahoogroups.com
Sent: Thu, May 27, 2010 11:09:43 PM
Subject: Re: [korg_mono-poly] ...and all of the sudden, no sound!

  
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@yahoo. com> wrote:


>From: chad imes <likeandrot@yahoo. com>
>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
>
>