[sdiy] MonoPoly SSM2033 Insanity

Neil Johnson neil.johnson71 at gmail.com
Sun Feb 23 23:52:27 CET 2020


I would start with the service manual:
http://dl.lojinx.com/analoghell/KorgMonoPoly-ServiceManual.pdf

And also read this page:
http://www.tauntek.com/MonoPoly.htm

In particular the bit about the extra board that Korg added.  In the
service manual this is KLM-398.

Cheers,
Neil

On Sun, 23 Feb 2020 at 22:22, Randel Osborne
<randel at redshift-consulting.com> wrote:
>
> Hello-
>
> I have a MonoPoly on the repair bench that has me baffled.
>
> All oscillators output the appropriate waveforms, but at 32KHz, and don’t keyboard track.
>
> All CVs leading to the 2033 are as expected.
>
> Pin 5 of the SSM2033 is CV in, as per the spec sheet.
>
> Pin 5 is not connected to the circuit board. There isn’t even a solder pad. This is the same for all 4 oscillators.
>
> Pin 5 is not connected to the CV on the schematics, although it comes really close, and looks like it should be.
>
> What am I missing?
>
> Does anyone have any experience with this beast?
>
> Thanks.
>
>
> -Randel
>
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