It might be one of the 4069 buffers that feed the R2R DA converter
(IC6, IC7)
Or, I had this once, the MPX CV signal (before the antilog) is routed
all over the PCB. There was some minor battery acid damage even on the
KLM-366 which affected the long PCB trace. You might cut it on both ends
and route a wire directly.
Johannes
Am 2015-07-24 um 17:07 schrieb Bob Grieb bobgrieb@yahoo.com [PolySix]:
> Hi,
>
> On the PolySix, the DAC output is linear. Every step is a semi-tone. That voltage is
> converted into an exponential one for the oscillators by the anti-log circuit. (which includes
> the opto-coupler of course)
>
> If all of the oscillators show the same poor tuning, then the problem is in the anti-log
> circuit, or in the S&H (4051) at its output.
>
> I uploaded a procedure a while back to the files section for adjusting the anti-log
> trimmers. You could also use that to help measure whether the anti-log is working
> correctly with just a voltmeter. If the trimmers have been messed with, then you will
> definitely need to re-calibrate it.
>
> Also I uploaded a re-drawn schem of that circuit so you can see a little better how
> it works.
>
> Bob Grieb
>
>
> --------------------------------------------
> On Fri, 7/24/15, jacklane@sbcglobal.net [PolySix] <PolySix@yahoogroups.com> wrote:
>
> Subject: [PolySix] Re: tuning issue still... / local repair STL
> To: PolySix@yahoogroups.com
> Date: Friday, July 24, 2015, 9:57 AM
>
>
>
>
> Thanks Tony! Unfortunately the octocoupler has
> already been replaced. So we can rule that out. Both sides
> of the board have been thoroughly cleaned and all the
> traces redone everywhere that the battery acid leak
> occurred. I am open to other thoughts / suggestions you or
> anyone may have. I am even half tempted to by a kiwi six
> replacement board and power supply If could be sure it would
> fix these issues but would hate to drop that kind of money
> and still not have the P6 fixed.... Jack
>
>
>
>
>
>
>
>
>
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>
> ------------------------------------
> Posted by: Bob Grieb <bobgrieb@yahoo.com>
> ------------------------------------
>
>
> ------------------------------------
>
> Yahoo Groups Links
>
>
>
>
>
>Message
Re: [PolySix] Re: tuning issue still... / local repair STL
2015-07-24 by Johannes