Vintage Synth Repair

http://www.oldcrows.net/~oldcrow/synth/tips.txt

http://www.oldcrows.net/~oldcrow/synth/tips.txt

hey chris, thanks for this.  i m pretty new to repairing, confident with a soldering iron from years of making up guitar leads etc but lacking an electronics

Thanks for this info.

It actually confirms something I've been doing for a while:

Boss Dr-55 drum machines often will not play back, and behave oddly 
in program mode. Replacing the 4011 chip (I always us a socket, 
too), can sort this out. Not always, though, and I haven't worked 
out why. I suspect differences between the tolerances on the modern 
chips and the old ones.

The same thing applies to Soundmaster SR-88s and related machines, 
they all use 4011s.


 


--- In vintagesynthrepair@yahoogroups.com, "Gareth Jenkinson" 
<gareth.jenkinson@...> wrote:
>
> hey chris, thanks for this.  i'm pretty new to repairing, 
confident with a
> soldering iron from years of making up guitar leads etc but 
lacking an
> electronics backround.  this information is really useful.
> 
> if anyone has similar resources, please post them.  i'm sure there 
are a lot

> of inexperienced people like me on the list desperate for tips...
> 
> cheers
> gareth
> 
> 
> On 05/04/06, chris_nairn <chris_nairn@...> wrote:
> >
> > http://www.oldcrows.net/~oldcrow/synth/tips.txt
> >
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
>

>That's the theory that I'm going forward with to fix my MM+. Haven't 
>checked the 4000 density, but so far can't really implicate an issue (there 
>can be quite a few actually), all suspect caps will be replaced as 
>suggested.

From what I've read, many MM problems stem from poor quality cable 
connectors and things like that.  Replacing/reseating all cables and 
reseating all socketed chips is easy enough to do and could potentially 
solve a lot of problems.