Discussion about the Korg PolySix synthesizer

After years of procrastinating, I spent this past weekend creating
schematic and PCB files for the KLM-367A.  It has gotten to the point
where it takes less time to assemble a new board than to repair a damaged
one.  Thus, I will be offering new replacement boards in the very near
future.  Here is an image of the layout:

http://www.oldcrows.net/~oldcrow/klm367a_img.gif

  Notice the 3V CR2032-type coin cell socket that replaces the evil, old 
NiCad battery. ;)

  I known this for a long time, but I might remark that the Polysix
service manual's KLM-367 schematic has a few errors.  My schematic is
"correct" as it is derived from the manual's schematic but cross-checked
against the actual board layout.  The result is the exact same circuit as
is implemented on original KLM-367s.

  Once I build and test a few of these boards, I'll make a few revisions
to better support adding in Ricard Wolf's MIDI retrofit as well as the
little bit of hardware needed to support adding in my "2nd VCO PCB" which
provides 2 VCOs per voice similar to the Trident.

Crow
/**/

Would it be feasible to make a list of the errors in the
original Korg documentation, so that we could mark up the
corrections on it?


 --- The Old Crow <oldcrow@oldcrows.net> wrote: > 
>   After years of procrastinating, I spent this past
> weekend creating
> schematic and PCB files for the KLM-367A.  It has gotten
> to the point
> where it takes less time to assemble a new board than to
> repair a damaged
> one.  Thus, I will be offering new replacement boards in
> the very near
> future.  Here is an image of the layout:
> 
> http://www.oldcrows.net/~oldcrow/klm367a_img.gif
> 
>   Notice the 3V CR2032-type coin cell socket that
> replaces the evil, old 
> NiCad battery. ;)
> 
>   I known this for a long time, but I might remark that
> the Polysix
> service manual's KLM-367 schematic has a few errors.  My
> schematic is
> "correct" as it is derived from the manual's schematic
> but cross-checked
> against the actual board layout.  The result is the exact
> same circuit as
> is implemented on original KLM-367s.
> 
>   Once I build and test a few of these boards, I'll make
> a few revisions
> to better support adding in Ricard Wolf's MIDI retrofit
> as well as the
> little bit of hardware needed to support adding in my
> "2nd VCO PCB" which
> provides 2 VCOs per voice similar to the Trident.
> 
> Crow
> /**/
> 
> 
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--- The Old Crow <oldcrow@oldcrows.net> wrote:
> 
>   After years of procrastinating, I spent this past weekend creating
> schematic and PCB files for the KLM-367A.  It has gotten to the point
> where it takes less time to assemble a new board than to repair a damaged
> one.  Thus, I will be offering new replacement boards in the very near
> future.  Here is an image of the layout:
/great stuff deleted

...SWEET!  you Rock!  2nd osc board sounds wonderful
cheers,
-S

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Here is my list:

  1) IC24 on the schematic (below IC26 and to the left of RAM IC32) is 
mislabled as IC34.

  2) IC30 & IC31 have pin 4 listed twice.  The incorrect pin is the one(s) 
tied to +5V.  The pins to +5V should read 1,5,10,13,14.

  3) Pin 3 of IC27 (in the DAC section) should connect to GNDA (not GND).

  4) C33 (2uF2) positive lead goes to collector of Q5 (R98 is mistakenly 
shown in the path).

Crow
/**/

On Tue, 26 Aug 2003, David Davis wrote:

> Would it be feasible to make a list of the errors in the
> original Korg documentation, so that we could mark up the
> corrections on it?

*very* useful, thanks!!

----- Original Message ----- 
From: "The Old Crow" <oldcrow@oldcrows.net>
To: <PolySix@yahoogroups.com>
Sent: Monday, September 01, 2003 8:33 AM
Subject: Re: [PolySix] I finally managed to make new a KLM-367


>
>   Here is my list:
>
>   1) IC24 on the schematic (below IC26 and to the left of RAM
IC32) is
> mislabled as IC34.
>
>   2) IC30 & IC31 have pin 4 listed twice.  The incorrect pin is
the one(s)
> tied to +5V.  The pins to +5V should read 1,5,10,13,14.
>
>   3) Pin 3 of IC27 (in the DAC section) should connect to GNDA
(not GND).
>
>   4) C33 (2uF2) positive lead goes to collector of Q5 (R98 is
mistakenly
> shown in the path).
>
> Crow
> /**/
>
> On Tue, 26 Aug 2003, David Davis wrote:
>
> > Would it be feasible to make a list of the errors in the
> > original Korg documentation, so that we could mark up the
> > corrections on it?
>
>
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>
>
>