[sdiy] broken chorus on mks-30

[Danjel van Tijn]

I pulled my mks-30 out of the closet and found that it is no longer
working %100. The synth works perfectly until I turn the chorus on.
With chorus engaged the output is distorted and I hear a loud hum.

I can find schematics for every part of the mks-30 except for the
power board that has the chorus circuit on it.

Has anyone experienced a simmilar problem and know how to fix this?
Maybe they have a scan of the schematic?

In exploring the synth which has 6 perfectly working 80017A chips I am
wondering if this synth is worth more as parts then as a working
synth? For example the the 80017A chips sell for $60 each x 6 = 360USD
 while the average mks-30 only sells for about $275.

cheers,
Danjel