Discussion about the Korg PolySix synthesizer

How about PWM Speed or Effects Speed? They also have their own LFO signal that could be bleeding in somewhere.
Don B.

From: mailto:PolySix@yahoogroups.com 
Sent: Monday, August 10, 2015 2:40 PM
To: PolySix@yahoogroups.com 
Subject: Re: [PolySix] VCOs slightly modulated due to battery board malfunction

  
No, it isn't related with the speed of the MG. Once I repaired another KLM-367A board which produced a high speed modulation in the sound, I replaced IC30 and the problem was solved. But this time I've replaced IC30 and IC31 and the slow modulation remains. All other functions are ok.

--------------------------------------------
El lun, 10/8/15, backshall1@bellsouth.net [PolySix] <PolySix@yahoogroups.com> escribió:

Asunto: Re: [PolySix] VCOs slightly modulated due to battery board malfunction
Para: PolySix@yahoogroups.com
Fecha: lunes, 10 de agosto, 2015 20:32


 













Does it change with the MG speed control or does it
seem unrelated to the 
MG?
Don B.


 

From: mailto:PolySix@yahoogroups.com

Sent: Monday, August 10, 2015 2:15 PM
To: PolySix@yahoogroups.com

Subject: [PolySix] VCOs slightly modulated due
to battery board 
malfunction
 
 


Hi again. This time I have a Polysix whose VCOs are
always modulated by a 
very slow sine or triangle wave. Of course all modulation
controls in the panel 
and mod wheel are at zero value. If I change the battery
board using a good one, 
the modulation disappears, so it is clearly a problem of the
KLM-367A. Do you 
know what parts should I check?. Thank you for your help.

Kind 
regards

Manuel











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