Vintage Synth Repair

Thanks for the tips Scott. My meter is most definitely old-school, but it should do the trick. My fixes so far have mostly been of the mechanical variety - keys, switches, soldering of a battery. Hopefully this can be my first truly 'electronic' fix. :-)

Hopefully I'll get some time this weekend. I'll report back.

Have fun with your clients synths! At least they're not like modern cars - I could clearly tell from my sportscar's computer that the mechanics had taken it for a very throttle heavy and long joy ride.
Easy on the mod wheel Scott ;-)

Susie
--- In vintagesynthrepair@yahoogroups.com, "Scott" <painintheamp@...> wrote:
>
> --- In vintagesynthrepair@yahoogroups.com, "windsurfinsusie" <gardens@> wrote:
> >
> > Hi, I've just acquired a Roland RS-202. It was described as fully working, but unfortunately it's a little too fully working. I'm not sure if the original owner realised that when you play a note, the bottom F# of the upper half of the split keyboard also gets triggered. It works great in the right key, but not good in others!
> > 
> > Before I open it up, has anyone got any tips? Am I looking for a duff diode, or a simple short? Can diodes fail as a short circuit? I've found a schematic which seems to imply the problem is with a diode or transistor. What's most likely to fail on these old machines?
> > 
> > Thanks for any help
> > Susie
> >
> Hi Susie,
> 
> Diodes can go short . If you have a simple multimeter , it should have a diode check function. If you have an "old school" meter , put it on 1K ohm range and the diode should read conducting one way and open or non-conducting the other way.
> 
> I would check for any ribbon or multipin connectors off the keyboard assby and inspect them and reseat them.
> 
> I havent work on one of these yet but there's plenty of time on earth for it.
> 
> I have a Minimoog and a Yamaha CS-15 in the shop right now and I also want to play them as well as MOD them for my client.
> 
> Cheers,
> 
> Scott in Vermont
>