Discussion about the Korg PolySix synthesizer

Thanks to everyone here, this is an amazing place. That said, I am completely stumped with my rebuild.

I just recently finished up my KLM 367 rebuild, and everything looks fine. I reused the rare ICs, the clock, and some other parts that made sense to salvage. 

I had purchased this P6 knowing that it had suffered from corrosion on the computer board. It had about 30 blown tracks, all in the common areas. When I received the unit, it did make some sound, but had the typical blown battery issues(all the patch lights were stuck on, a lot of the functionality didn't work, etc). Now after the 367 replacement, I am not getting any sound at all in manual mode. There is no sound read, but I didn't think there would be anything there, as the RAM would be blank. I can tell that the output amp is working because because I am hearing the noise floor, which I can attenuate using the volume knob. The patch computer seems to be working, as I can change groups and patches as it should work. 

Here are some other things I noticed: The MG led is constantly illuminated, and doesn't change when I adjust the rate. Pressing the Unison, arpeggiator, poly buttons, do not appear to do anything at all.

This is the first synth repair/build I have done, but I have been picking up a lot. I have a decent background with computers and some electronic knowledge. This is probably something easy, that my amateur skill set is over looking.

Thanks

Here's something that gives food for thought:

At 2:01 Uhr +0000 22.09.2011, roboliot@sbcglobal.net wrote:
> Here are some other things I noticed: The MG led is constantly illuminated,
> and doesn't change when I adjust the rate. Pressing the Unison, arpeggiator,
> poly buttons, do not appear to do anything at all.

The latter means that there is some problem with the KLM366 board (or
perhaps with the interconnects or the power supply). The key assigner and
its control are NOT handled by the 367; they are completely independent.

Does the Arpeggiator LED blink?

The MG issue could be caused by forgetting to fix the two missing traces on
the clone board. Did you complete the two bug fixes mentioned on Jed's site:

https://sites.google.com/site/jedjorgensen/klm367a

 

Don B.

 

  _____  

From: PolySix@yahoogroups.com [mailto:PolySix@yahoogroups.com] On Behalf Of
Malte Rogacki
Sent: Thursday, September 22, 2011 6:06 AM
To: PolySix@yahoogroups.com
Subject: Re: [PolySix] Rebuilt 367 board issues

 

  

Here's something that gives food for thought:

At 2:01 Uhr +0000 22.09.2011, roboliot@sbcglobal.net
<mailto:roboliot%40sbcglobal.net>  wrote:
> Here are some other things I noticed: The MG led is constantly
illuminated,
> and doesn't change when I adjust the rate. Pressing the Unison,
arpeggiator,
> poly buttons, do not appear to do anything at all.

The latter means that there is some problem with the KLM366 board (or
perhaps with the interconnects or the power supply). The key assigner and
its control are NOT handled by the 367; they are completely independent.

Does the Arpeggiator LED blink?





[Non-text portions of this message have been removed]

Also double check your transistor orientation. Some of the modern
replacements have different pinouts than the old ones, so if you used any
old ones they could be out of order. I know this issue has caught a couple
builders in the past.

Jed
On Sep 22, 2011 4:26 AM, "backshall1" <backshall1@bellsouth.net> wrote:
> The MG issue could be caused by forgetting to fix the two missing traces
on
> the clone board. Did you complete the two bug fixes mentioned on Jed's
site:
>
> https://sites.google.com/site/jedjorgensen/klm367a
>
>
>
> Don B.
>
>
>
> _____
>
> From: PolySix@yahoogroups.com [mailto:PolySix@yahoogroups.com] On Behalf
Of
> Malte Rogacki
> Sent: Thursday, September 22, 2011 6:06 AM
> To: PolySix@yahoogroups.com
> Subject: Re: [PolySix] Rebuilt 367 board issues
>
>
>
>
>
> Here's something that gives food for thought:
>
> At 2:01 Uhr +0000 22.09.2011, roboliot@sbcglobal.net
> <mailto:roboliot%40sbcglobal.net> wrote:
>> Here are some other things I noticed: The MG led is constantly
> illuminated,
>> and doesn't change when I adjust the rate. Pressing the Unison,
> arpeggiator,
>> poly buttons, do not appear to do anything at all.
>
> The latter means that there is some problem with the KLM366 board (or
> perhaps with the interconnects or the power supply). The key assigner and
> its control are NOT handled by the 367; they are completely independent.
>
> Does the Arpeggiator LED blink?
>
>
>
>
>
> [Non-text portions of this message have been removed]
>


[Non-text portions of this message have been removed]

I will look at the 366 today.

The Arp LED does blink, and the rate changes as I turn the speed pot clockwise as usual.

--- In PolySix@yahoogroups.com, Malte Rogacki <gacki@...> wrote:

>
> Here's something that gives food for thought:
> 
> At 2:01 Uhr +0000 22.09.2011, roboliot@... wrote:
> > Here are some other things I noticed: The MG led is constantly illuminated,
> > and doesn't change when I adjust the rate. Pressing the Unison, arpeggiator,
> > poly buttons, do not appear to do anything at all.
> 
> The latter means that there is some problem with the KLM366 board (or
> perhaps with the interconnects or the power supply). The key assigner and
> its control are NOT handled by the 367; they are completely independent.
> 
> Does the Arpeggiator LED blink?
>

Der,

I had read about the bugs with the missing tracks... I guess I forgot to implement them... as well as the stock transistors in the wrong orientation. Still at work and won't be able to dig at it until later.

One more q about the 366B. What could possible me the most common culprit in causing the keyboard to stop functioning all together? Would it be the key assigner DAC circuitry? I once had an issue with a SCI Sixtrak that had a bad keyboard scanner that made it act really crazy with whacky tuning stability, but it still output a sound when I pushed down keys. I will look into this and the supply voltages when I get home tonight.

Thanks again for everyone's help and comments.


--- In PolySix@yahoogroups.com, Jed Jorgensen <jed.jorgensen@...> wrote:

>
> Also double check your transistor orientation. Some of the modern
> replacements have different pinouts than the old ones, so if you used any
> old ones they could be out of order. I know this issue has caught a couple
> builders in the past.
> 
> Jed
> On Sep 22, 2011 4:26 AM, "backshall1" <backshall1@...> wrote:
> > The MG issue could be caused by forgetting to fix the two missing traces
> on
> > the clone board. Did you complete the two bug fixes mentioned on Jed's
> site:
> >
> > https://sites.google.com/site/jedjorgensen/klm367a
> >
> >
> >
> > Don B.
> >
> >
> >
> > _____
> >
> > From: PolySix@yahoogroups.com [mailto:PolySix@yahoogroups.com] On Behalf
> Of
> > Malte Rogacki
> > Sent: Thursday, September 22, 2011 6:06 AM
> > To: PolySix@yahoogroups.com
> > Subject: Re: [PolySix] Rebuilt 367 board issues
> >
> >
> >
> >
> >
> > Here's something that gives food for thought:
> >
> > At 2:01 Uhr +0000 22.09.2011, roboliot@...
> > <mailto:roboliot%40sbcglobal.net> wrote:
> >> Here are some other things I noticed: The MG led is constantly
> > illuminated,
> >> and doesn't change when I adjust the rate. Pressing the Unison,
> > arpeggiator,
> >> poly buttons, do not appear to do anything at all.
> >
> > The latter means that there is some problem with the KLM366 board (or
> > perhaps with the interconnects or the power supply). The key assigner and
> > its control are NOT handled by the 367; they are completely independent.
> >
> > Does the Arpeggiator LED blink?
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
> 
> 
> [Non-text portions of this message have been removed]
>