Vintage Synth Repair

Duncan, 
I tried your suggestion, swapping out the U13 chip with one from another working mm+ but the problem remained. Any other suggestions?
Thank you in advance.
-LOTS

--- In vintagesynthrepair@yahoogroups.com, "duncan" <ferrograph@...> wrote:
>
> >>thinking about it, & about 4016s generally, it's likely that this is one IC we're talking about. each has four switches internally, so one would be enough for three oscillators-worth of mod switching.<<
> 
> found the schemo at memorymoog.com. U13 is your culprit, I reckon, & if I'm right, you'll have lost pwm on osc 1 aswell.
> 
> schemo here:
> http://www.memorymoog.com/docs/
> 
> you want sheet 2 of the schematics pdf.
> 
> hth-
> duncan.
>