Vintage Synth Repair

Well looks like I've fixed it...just burning it in for a hour or two
now..it was a bad connection from IC201 which is one of the S10430
Divider IC's. Basically a bad solder joint, but it was absolutely
undetectable with the naked eye. I pushed the IC..the sound stopped, I
re-soldered the IC. Seems to be OK now.

Oh and the dividers are soldered in so no easy quick swap between the
two..they are 40 pin IC's. 

Also maybe this is a warning to those looking to buy an RS-09..RS-09's
are pretty cheap..but looking around the web for a spare S10430
divider IC showed that they are very hard to find and extremely
expensive. I found one IC for $150.

Phil.


--- In vintagesynthrepair@yahoogroups.com, "eggwheatis"
<eggwheatis@...> wrote:
>
> Update: Its considered to be C#4 in the manual not 1..also just
> looking at the schems it points towards a S10430 Chromatic Divider
> IC...which is bad as that looks pretty hard to get. There are two
> dividers and I think they may be in sockets so it'll be pretty fast to
> just swap them round to test..
> 
> 
> --- In vintagesynthrepair@yahoogroups.com, Philip <eggwheatis@> wrote:
> >
> > Ok I switched on my Roland RS-09 tonight and it has a
> > definite problem now...I have C# playing all the time
> > fairly loudly in the background..It relates to C#1 on
> > the keyboard but its not a keyboard related problem if
> > you see what I mean. IE if i play the C# 1 key it
> > plays a louder C# on the top. It's across all the
> > sounds and is affected by the tune knob, transpose
> > etc. Any ideas before I break out the schematics?
> > 
> > Phil.
> > 
> > 
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>