Vintage Synth Repair

Update...

I checked the pots, the reason for the misbehaviour of the Multimoog was in fact R53, the good news is: it is accessable from the rear. It´s the hole right next to the main power switch on the right, below the row of holes from the mainboard.

Now it is working like it should! What a nice machine... with the filter mod it is really nice sounding.

Just came back from service 2 weeks ago, now the OSC1 is modded so there is no jitter noise anymore. Smooth sounding synth...

Now I need some help with the next machine... ;-)

--- In vintagesynthrepair@yahoogroups.com, Terje Winther wrote:
>
> > where is R53 located? I guess on tandem board 3, not the main board?
> >
> Yes, that is correct. I don´t have my multimoog right here, so I don´t
> know exactly where on the board it is.
>
> > I guess there should be an access hole in the rear?
> >
> Unfortunately not. There are some of the trimmers not accessible from
> the rear. You have to open the synth to locate them.
>
> > For me it seems, that the keys come in contact too soon with the
> > force sensor rod, the keys are not fully down, when getting in
> > contact, and therefore I can not really control the pressure.
> > It feels like I press the keys down 2 mm, and immediately the force
> > sensor is reacting...
> >
> Hm. Yes, that seems not right.
>
> > Maybe this also could be a mechanical problem, maybe some cup
> > washers missing or something like that. Could that be possible?
> >
> Yes, it could be something mechanical, like you mention.
>
> >
> >
>
> Terje Winther
> terje.winther@...
> http://www.wintherstormer.no/
>