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
>
>
>