Discussion about the Korg PolySix synthesizer

--- In PolySix@yahoogroups.com, "Andrew Jury" <andy@...> wrote:
>
> Now forgive me if I am wrong 
> but I understood the HA14051 worked like this. You appliy a voltage 
> to one of the 8 mux inputs marked X0-7. The voltage change is 
> detected and a bitmap is set on data address lines A, B and C 
> according to which pin was strobed. At the other end this bitmap is 
> decoded the data read on the receiving mux and the appropriate signal 
> (in this case a voltage) will appear at the correct pin as determind 
> by the bitmap. The fact that the voltage doesn't swing correctly 
> between the two poles of the pot would suggest a fault with the 
> transmitting HA14051? 

That's how it works, but before you go suspecting the mux, are you sure you're getting 
the full range of digital data on A, B and C at both ends?  The at both ends bit being really 
important, on one of my KLM-367s I had the right signals present right up to within 1mm 
of the connector, at which point one of my mux selection signals became something 
entirely different thanks to the wonderful way the nicad redesigned the board.

Sorry about the over-zealous quote snipping, btw.

--
phil