Vintage Synth Repair

Hi

In the service manual I bought there is no schematics for the power
Supply (board KLM 480). Does anyone have those schematics or more
importantly knows the value of electrolytic capacitors C11, C12, C13? 

Thanks in advance

--- In vintagesynthrepair@yahoogroups.com, "maschinengeist001"
<maschinengeist001@...> wrote:
>
> Hi
> 
> In the service manual I bought there is no schematics for the power
> Supply (board KLM 480). Does anyone have those schematics or more
> importantly knows the value of electrolytic capacitors C11, C12, C13? 
> 
> Thanks in advance
>
I have a couple poly61's open here..and schematics but they're hard to
read.  Where are the caps.  I'll look. -Bob

--- In vintagesynthrepair@yahoogroups.com, "Robert Weigel" 
<sounddoctorin@...> wrote:

> I have a couple poly61's open here..and schematics but they're hard to
> read.  Where are the caps.  I'll look. -Bob


Hi Bob

The Electrolytic Capacitors are in the Power Supply board KLM-480B. 
They can't be missed. Those are the biggest of the lot. From what I'm 
told, the value should be: 35V 2200uF (x2) + 16V 4700uF. What I ignore 
is which goes where (C11, C12, C13). 

Also, any ideas where I can get ahold of a bunch of Switching Diodes 
1S1555 (or equivalent) + 50V 0.68uF 85° Electrolytics Capacitors? At 
least 10 of each. Digi-key doesn't have any and I doubt Mouser does. 
I'd need them quite urgently.

Thanks in advance

>Also, any ideas where I can get ahold of a bunch of Switching Diodes
>1S1555 (or equivalent) + 50V 0.68uF 85\ufffd Electrolytics Capacitors? At
>least 10 of each. Digi-key doesn't have any and I doubt Mouser does.
>I'd need them quite urgently.

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.

_________________________________________________________________
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--- 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

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
> 
> 
> 
>

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
> > 
> > 
> > 
> >
>