[sdiy] bizarre Prophet 600 LFO

[dragons]

Hi,
I wonder if there is a calibration procedure for the pitch and mod 
wheels ?
would be worth checking the sample and hold caps as I think these can 
sometimes cause problems if the value of them drifts. or am I thinking 
of another Prophet ?

regards Peter B

On 29/12/10 09:57, Bob Weigel wrote:
  > OK as if that isn't bizarre enough...ahem..I just fixed a Prophet
> 600..had a bad LF357 dac I-V op amp. However...it's mostly working save
> one thing near as I can tell. LFO works great on PWM and FIlter
> modulation. But the pitch is all whacky. Once you move the wheel or
> initial amount at all it immediately starts popping convulsive
> transients and more modulation than you'd expect at the low amount of
> modulation wheel you are giving it. I'm thinking the EPROM is corrupted
> probably. Any other thoughts on that one?
>
>