OldSynths

Sounds to me like the V into the osc. isn't making it...  

Ed

David Shoemaker wrote:

> Hi everyone,
>
> I took delivery on my ARP Pro Soloist today.  I knew it would need
> repairs when I bought it, and here's what I've discovered so far.  I
> would really appreciate any suggestions on the next diagnostic/repair
> steps.  I have a hunch this is not going to be that complicated. 
> (crossing fingers)
>
> Here's the problem:  It powers up correctly.  Every key triggers a
> sound, but the pitch does not change from key to key.  The sound it
> *does* make is a very low cycle tone, much lower than any keyboard
> should make.  It does not seem to be an LFO, because:  The pitch
> changes in octaves (roughly) as I move the octave shift lever.   Of
> course, the pitch is so low to start with that the "normal" and "low"
> octave settings are just clicks.  The pitch does NOT change, as far as
> I can tell, when I adjust the tuning trimpot, nor does it respond to
> the front panel tune "knob".
>
> The preset switches DO change the timbre of the sound, as if the
> filters are working correctly.  The volume slider works normally.  The
> "touch sensitivity" switches act as they should EXCEPT for the pitch
> bend, and possibly the vibrato (hard to tell with such a low pitch
> though).  Portamento does NOT seem to work.
>
> The presets I would expect to be in a lower octave seem to be so, e.g.
> "Bass", "Tuba".
>
> What I've done so far:
>
> --I replaced the aluminum caps in the power supply, and the output from
> the power supply is normal.
> --I very carefully cleaned all the oxidation off the J-wires and the
> contact bar.  Key triggering is almost perfect as far as I can tell.
>
> Can anyone offer any suggestions?  I have a couple sources for spare
> parts if I need them--I'm just not sure what to test/fix next.
>
> Thanks very much,
> David Shoemaker
>
>
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