Vintage Synth Repair

Hello,
I joined this list because I have just get damaged my Korg Poly 61 (also
another RK100 controller seems to have the same symptoms) . It gets
crazy when powered on, all lights flhasing and emiting strange sounds, I
think it's related to capacitors, as you are talking about. Please if
you have a service manual and could send me a copy, it would be great.

About the diode, I'm sure is not a problem to replace for any other not
being exact, and probably the capacitor could be replace for the more
closely one 470 or 500 are easy to find), I use to replace this kind of
things in other machines and all they worked. If not, you always can do
some combination , as you probably know, in serial combination,
capacitors give you the the result of (c1.c2.c3...cn)/(c1+c2+c3...cn)

Regards.


--- In vintagesynthrepair@yahoogroups.com, "GB" <grantbt@...> wrote:
>
> Maybe you can find a similar diode in another Korg product from that
era?
> 
> GB
> 
> ----- Original Message ----- 
> From: "maschinengeist001" <maschinengeist001@...>
> To: <vintagesynthrepair@yahoogroups.com>
> Sent: Monday, April 02, 2007 6:24 PM
> Subject: [vintagesynthrepair] Re: Korg Poly-61 Capacitors in Power
Supply
> 
> 
> > --- In vintagesynthrepair@yahoogroups.com, "Scott Nordlund"
> > <gsn10@> wrote:
> > 
> >> capacitor: digikey part number P930-ND
> >> 
> >> Not sure about the diode.  Depending on how it's used, you may be
> > able to 
> >> replace it with a generic component (1N4148 or something).  It seems
> > to be a 
> >> fairly obscure part (assuming the part number is correct),
> > cross-references 
> >> aren't turning up anything useful, but I don't think it's anything 
> >> particularly special.
> > 
> > Thanks Scott
> > 
> > Oddly, I looked up on Digikey.ca (the Canadian branch) and didn't see
> > it. Maybe I made a typo or something. Thanks for the part number, I'll
> > head there again.
> > 
> > As for the 1s1555 (the designator is accurate), it's an obsolete
> > switching diode. I've been looking at the 1N41XX but the specs weren't
> > exact match. I've always liked to replace components with their exact
> > equivalent or the closest to the original. Even eBay(.ca) didn't help
> > at locating some. I'll keep looking. 
> > 
> > Once again, thank you for the reply
> > 
> > 
> > 
> > 
> > 
> > Yahoo! Groups Links
> > 
> > 
> > 
> >
>