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Prophet 5 voice card/chip/cap problem...

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  • Prophet 5 voice card/chip/cap problem...

    I bought a Prophet 5 rev 3.0 this past July. Initially I had some j-wire problems, mainly re-triggering keys. I was able to fix this temporarily by cleaning the j-wire and busbar.



    A few hours ago, I noticed that when I played chords that only 1 note that would be built from, say for example, a 5 note chord, would sound louder than the others. If I played for example, C E G Bb C, the Bb would sound louder...then I'd change to C E G B C and the last C would be louder, then if I went back to the C E G Bb C, the last C would still be louder (in amplitude) even though originally it was the Bb that was louder. This happens with any chord, even if its only a 2, 3 or 4 note chord. This leads me to think its possibly a chip/cap problem in the voice card. I am no tech by any means, so I could be very likely wrong here.



    I tried each oscillator by itself through the mixer, first through osc. A then osc. B...osc. B seems to be the one with voice card issues. When using any of the three waveforms, in each octave I only get a couple of notes. For example, if I'm in middle C and play CDE...F only makes a crackily sound (almost like a bad/dirty pot when it you try turning it) or like the pops and hiss of a vinyl record, then GAB work fine and the C in that next octave makes the crackily noise, then DEFG sound until B, etc. etc., this changes in each octave.



    I also tried the filter without any waveforms and just the resonance up, and played a scale, all keys worked although obviously nothing musical came out of it, just high pitched glitchy/dissonant sounds. Meaning the filter seems to be working as it should.



    I wanted to see if anyone had this problem before and what it ended up being/how they fixed or got it fixed.



    I'm in southern California so I'm thinking of eventually getting it fixed either by http://www.analogsynthservice.com/ or http://www.audiorehab.net/services.html



    The first link gets great reviews on forums, but I'd have to ship it north and run the risk of it getting damaged on the way/or back from repair. The second link is less than an hour away for me, which would obviously be the best option transportation wise. If anyone has a tech they'd recommend in SoCal or can vouch for the ones I linked, I would appreciate it.



    Any help would be appreciated.

  • #2
    Bump 'cause this post was hidden by the automatic spam catcher...
    <div class="signaturecontainer"><div align="right">Hurrr. Derp, derp, derp.</div></div>

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    • #3
      You are likely correct, some small capacitor could be going bad. $150 to diagnose and $.50 in parts. Worst case would be a CEM chip needing replaced.
      <div class="signaturecontainer">Moe<br><br>---<br><br>It puts the SINES in the basket, or else it gets the hose again.<br><br><a target="_blank" href="http://www.hotrodmotm.com">http://www.hotrodmotm.com</a></div>

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      • #4
        You are likely correct, some small capacitor could be going bad. $150 to diagnose and $.50 in parts. Worst case would be a CEM chip needing replaced.
        <div class="signaturecontainer">Moe<br><br>---<br><br>It puts the SINES in the basket, or else it gets the hose again.<br><br><a target="_blank" href="http://www.hotrodmotm.com">http://www.hotrodmotm.com</a></div>

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