Archive of the former Yahoo!Groups mailing list: Discussion about the Korg PolySix synthesizer

Hello,

basically the work of the CPU is: addressing something, then reading or writing the addressed source/destination.
To my experience (two polysixes recovered), the first thing to do, is to check all address destinationes, whether there are changing signals. Usually there are two stages of addressing at one chip: the direct address from the CPU and a chip-enable signal (or similar).

I would first check all address lines on the panel boards, then all address lines on the data delivery side (CPU board and voice board).

Florian

On 12.05.15 22:37 , noddyspuncture@hotmail.com [PolySix] wrote:

 

Hi folks,

Not been on here for some time, but I though I'd pop by and see if anyone can advise...?

My PolySix ∗had∗ the dreaded battery leak problem before I bought it... and it was fixed up professionally. And a rather good job was made of it by a highly regarded tech. It's been perfect for years... but now I have a problem with it.

All the LED's are lit... it plays "noises" - pitched, so you can still hear "no tes" - but non of the front panel controls in the Osc, Filter or Envelope sections work. The effects section controls do respond though. It does seem like the classic battery symptom...

I have meticulously gone over all the usual lines that open with the battery thing... but they all check out OK...!

I suspected the CPU but it has an output and scoping the data lines shows activity.

My question is... does anyone here actually understand how the CPU and all the associated logic IC's work together..? It occurred to me that I don't really understand that theory/side of things... an d I would really like to.

Where can I start? Are there any books etc.. that would get me there relatively quickly?

Is it the kind of thing that someone could "explain" to a technically minded person...? I do understand electronics and electronic theory in general but this part is baffling me.

Cheers,

Tom