Archive of the former Yahoo!Groups mailing list: Discussion about the Korg PolySix synthesizer

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Subject: Re: [PolySix] Mysterious pitch bend/modulation problem

From: Bob Grieb <bobgrieb@yahoo.com>
Date: 2014-02-05

Hi,

   Looks like just one signal comes from the front panel to the KLM367 for both of these signals.   It is called MOD.   Comes in on CN06-2.    You should see the voltage here
changing with the tune pot.   Then it needs to feed to one end of 10K resistor R9, and to C43.    Maybe that connection is broken?

     Bob


From: "pushwithlegs@gmail.com" <pushwithlegs@gmail.com>
To: PolySix@yahoogroups.com
Sent: Tuesday, February 4, 2014 10:14 PM
Subject: [PolySix] Mysterious pitch bend/modulation problem

 
hi all,
I have a couple of battery damaged polysixes on the bench at the moment which has been very useful for troubleshooting various problems however one has stumped me:

On one Polysix no matter which of the three pitch bend assemblies I swap in or which of the three KLM369 boards I swap in I can not get the Tune knob to function nor the bend depth to effect the bender.
(the bender/modulation wheels do nothing)
Thus I'm convinced the bender itself is fine and the KLM369 board is as well.

Whereabouts would be a recommended place to narrow down my search to address this issue if anyone else has encountered it (somewhere on KLM367?)
Many thanks!