Discussion about the Korg PolySix synthesizer

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
>
>  
>


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