Discussion about the Korg PolySix synthesizer

It was the IC31...

(but i changed the battery too...)


at


--- In PolySix@yahoogroups.com, "atuzzi" <antoniotuzzi@t...> wrote:
> 
> Ok,
> 
> The card seems ok, 
> The battery is the old style VARTA, but is not leaked (til 
> yesterday...). Proabably is the second or (I hope) the third one 
> (changed in 1998 maybe)
> 
> The P6 is outputting sounds, all the voices are working, and the 
adsr 
> can be modified and the filter and resonance too (Keyboard tracking 
> too).
> 
> but is not changing:
> 
> Waveform, Octave 4 8 16, pwm, sub osc mode, lfo destination and 
> effect type.
> (all digital paramenters?)
> 
> +
> 
> modyfing the intesity of the effects is acting on the LFO speed.
> 
> +
> 
> effect number 3 goes in "mute mode (no sound at all).
> 
> 
> all the analog parameters are changing (I checked with a 
voltometer).
> 
> I checked all the traces and vias with ohmeter (full conductivity, 
no 
> resistence.
> 
> My question:
> can be the the IC31 the culprit ? What's the exact function of the 
> 74ls08 in that point ?
> a broken ic31 can affect the parameters I described ?
> 
> can a 74hct08 can be used instead of the 74ls08 ?
> 
> Thank you
> 
> Antonio