[sdiy] Korg Poly61 a peculiar design!!

[Paul Cunningham]

Repairing the keyboard is relatively easy if you take your time to completely disassemble it. The trickiest part is removing the conductive rubber contacts without tearing them. Does anyone have a good approach to this? I usually use a tiny philips and push the tabs back through to the other side.

How do you repair the traces? I've seen one P61 where only solder was used... That looked a bit tedious though.... Is there a better way?

I'm still in the "completely redesign the motherboard camp" for now. It doesn't really look like it would be too hard. Dealing with voltage differences between arduino and this board would seem to be the only hurdle. The rest is multiplexing a (higher resolution) DAC and clocking as far as I can tell. I presume its possible to get rid of at least 50% of the existing electronics if you are going to redesign the control panel anyways. At current prices, why not have two analog boards?

-pc

On Apr 7, 2011, at 4:42 PM, "Paul Burns" <paul at fitvideo.co.uk> wrote:

> Is the keyboard totally dead , or just partially ? They can be resurrected
> with a bit of TLC...I have done so with a number and also rebuilt the
> damaged traces from the nicad corrosion ...
> 
> Regards
> 
> Paul
> 
> From: synth-diy-bounces at dropmix.xs4all.nl
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of m.bareille at free.fr
> Sent: 07 April 2011 17:48
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Korg Poly61 a peculiar design!!
> 
> Hi
> 
> I have a Poly61 too but with a dead keyboard. The keyboard is the true weak
> point of this synth, and there is no MIDI(sic)
> 
> I had +/- in mind to design a special MIDI interface for it to emulate the
> keyboard.
> 
> To rebuild /hack the cpu board seem to be a lot of work to do anyway , but
> nothing impossible , just time consumming.
> 
> A programmer like my MCV32 ( or like) could probably do the job to manages
> CVs
> and extra panels pot. I have adapted this board to replace the CPU into many
> RSF
> PolyKobold who are much morecomplex devices  , so it should work on a Poly61
> ,
> but this will not replace the keyboard anyway.
> 
> I am interested  by a readable schematic , at least to help me to decide
> what
> todo with this synth who is taking dust here since many years ...
> 
> Thanks,
> 
> Marc B.
> 
> 
> 
> 
>> 
>> I do have some actual paper on this model,  if anybody wants it.  I'd have
> to
>> dig a bit to be sure of exactly what I have,  though...
>> 
>>> KD
>>> --- Den ons 2011-04-06 skrev Tom Wiltshire <tom at electricdruid.net>:
>>> 
>>>> Have you got a link to some decent
>>>> schematics for the Poly 61, Karl?
>>>> 
>>>> I've got a service manual PDF for it, but it's more-or-less
>>>> unreadable.
>>>> 
>>>> Thanks,
>>>> Tom
>> 
>> 
>> --
>> Member of the toughest, meanest, deadliest, most unrelenting -- and
>> ablest -- form of life in this section of space,  a critter that can
>> be killed but can't be tamed.  --Robert A. Heinlein, "The Puppet Masters"
>> -
>> Information is more dangerous than cannon to a society ruled by lies.
> --James
>> M Dakin
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>> 
> 
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> ________________________________________
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 10.0.1209 / Virus Database: 1500/3556 - Release Date: 04/06/11
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>