[sdiy] Prophet 5 issue - any advice ?

[harrybissell at wowway.com]

What rev is the P5 ?

The poly-mod section itself should probably be calibrated...

Also its possible that the D/A multiplexer has a bad cap, analog
switch, or opamp...

H^) harry



On Mon, 18 Feb 2008 11:56:50 -0800 (PST), Gil W. wrote
> Hi all !
> 
> My P5 restoration project is almost completed
> (documented as a thread on HC's KSS). However, a small
> issue still exist, thought you might be able to help
> here.
> 
> Here's the problem:
> 
> When I engage the Freq. A button from the Poly Mod
> section, one voice is off tune.
> 
> In the service manual they say that the auto tune
> function is wide enough to handle most off-tune
> voices, and in any case that the auto tune feature
> can't tune a voice, one should check for a faulty
> component, rather than making any kind of calibration
> to the unit.
> 
> Is there any tuning capacitor which handles only the
> Freq. A tuning, for each voice ? My first thought was
> that there's a bad polypropelene cap somewhere in that
> voice's circuit.
> 
> any other ideas ?
> 
> Thanks all !
> 
>      
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Harry Bissell & Nora Abdullah 4eva