Vintage Synth Repair

Well I'm sure that the problem is on the PCB because there is some rust 
on the diode solder points that connect to the 7 notes with 
problems.(They are all one next to the other)

Does it matter if I use an other kind of diodes?

grantbt@... a \ufffdcrit :
> I don't know this unit, but I think they are probably
> just common signal diodes like 1n4148 or 1n914.
> If it's not the wiring/solder/diodes, it could be the
> chip that is either driving the keyboard scan lines
> or the chip that is reading them.  You'll have to
> follow the traces to find the offender...
>
> -----Original Message-----
> >From: Antoine Desch\ufffdnes <antdes45@...>
> >Sent: Jan 26, 2006 7:20 AM
> >To: vintagesynthrepair@yahoogroups.com
> >Subject: [vintagesynthrepair] Roland RD-300S trouble
> >
> >Hi,
> >
> >Someone asked me to fix a Roland RD-300S(7 notes not working). I managed
> >to open it and remove the keys. Now, the only problem is that there is
> >some rust on the solders, but the contact looks OK(After cleanup). I'll
> >re-work the solder points tomorrow, but I'd like to know the diode type
> >in case that one of them is dead.
> >
> >--
> >Antoine