Discussion about the Korg PolySix synthesizer

Hey guys!  Thanks again for providing these KLM367 boards!  Um, so yeah...  I just finished populating my new KLM367 clone board and I'm having trouble.  

I'm pretty sure that the trouble is somewhere in the factory MIDI board but I can't figure out the troubleshooting sequence or parts I might need to get this midi kit going again.

Here's my dillema:

I populated the board (KLM367 Clone) and omitted IC32  because the MIDI kit from the old board didn't have that IC either.  It looks like it wasn't needed.  The midi Kit jumpers the VCC battery line and the CS line.  The MIDI kit also makes other jumpers to random multiplexers and demultiplexers throughout the unit.

After power up, all I got was lights A, 1, and POLY to come on.  There is no response if I press the buttons. 

I got through the reset circuit calibration.

I couldn't get through the D/A adjustment.  I reset the jumpers and noticed that the stupid EPROM IC's weren't pushed in all of the way!!!!!! (Probably a fatal error).

After pushing in the EPROMS and resetting the sockets on the MIDI board, I got the D/A adjustment lights to come on.  I twirled the little trimmers until I got dizzy but couldn't get the one on the right to move; it was stuck on 4.

After checking further into the unit, Port 11 on the CN10 and CN06 is stuck at ground.  I checked continuity from the CPU to the connections and it tested OK.  Following the traces indicated that Port 11 doesn't really go anywhere except out of the CPU and into the CN06 and CN10 jacks.

Removing CN06 to test will fudge up the data lines because the spare multiplexer ports on the KLM369 4051 are being used for some midi board function.

------

Does anybody have suggestions or ideas?  I think that I'm going to purchase IC32 and a new CPU and see if I can get the board to work without the MIDI kit.

Does anyone have the ROM files or knowledge of the midi kit if it isn't trashed?

-Mike

Hi Mike,

I haven't played with the midi kit so I can't really help you there. My
suggestion was going to be just what you ended with: see if you can get it
working as intended first, then try adding the midi kit back on.

Best of luck!

Jed

On Sun, Feb 20, 2011 at 3:23 PM, Mike <mborish_2000@yahoo.com> wrote:

>
>
> Hey guys! Thanks again for providing these KLM367 boards! Um, so yeah... I
> just finished populating my new KLM367 clone board and I'm having trouble.
>
> I'm pretty sure that the trouble is somewhere in the factory MIDI board but
> I can't figure out the troubleshooting sequence or parts I might need to get
> this midi kit going again.
>
> Here's my dillema:
>
> I populated the board (KLM367 Clone) and omitted IC32 because the MIDI kit
> from the old board didn't have that IC either. It looks like it wasn't
> needed. The midi Kit jumpers the VCC battery line and the CS line. The MIDI
> kit also makes other jumpers to random multiplexers and demultiplexers
> throughout the unit.
>
> After power up, all I got was lights A, 1, and POLY to come on. There is no
> response if I press the buttons.
>
> I got through the reset circuit calibration.
>
> I couldn't get through the D/A adjustment. I reset the jumpers and noticed
> that the stupid EPROM IC's weren't pushed in all of the way!!!!!! (Probably
> a fatal error).
>
> After pushing in the EPROMS and resetting the sockets on the MIDI board, I
> got the D/A adjustment lights to come on. I twirled the little trimmers
> until I got dizzy but couldn't get the one on the right to move; it was
> stuck on 4.
>
> After checking further into the unit, Port 11 on the CN10 and CN06 is stuck
> at ground. I checked continuity from the CPU to the connections and it
> tested OK. Following the traces indicated that Port 11 doesn't really go
> anywhere except out of the CPU and into the CN06 and CN10 jacks.
>
> Removing CN06 to test will fudge up the data lines because the spare
> multiplexer ports on the KLM369 4051 are being used for some midi board
> function.
>
> ------
>
> Does anybody have suggestions or ideas? I think that I'm going to purchase
> IC32 and a new CPU and see if I can get the board to work without the MIDI
> kit.
>
> Does anyone have the ROM files or knowledge of the midi kit if it isn't
> trashed?
>
> -Mike
>
>  
>


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

Can you tell me which CPU does the KORG USA Midi kit use?
Is it a Z80?
Thanks.
Stef

It uses the original 8048.


--- In PolySix@yahoogroups.com, "Stefano" <tmste76@...> wrote:

>
> Can you tell me which CPU does the KORG USA Midi kit use?
> Is it a Z80?
> Thanks.
> Stef
>

Does it leave the 8048 on the 367 or it's trasfered on the new midi board?
It should't be enough for midi capabilities.
For shure there must be a bigger SRAM to hold the 120 presets

Do you know more?
Have you the 120 presets available in .wav?

thanks
Stef