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Vintage Synth Repair

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PAIA OZ nuisances

PAIA OZ nuisances

2006-04-23 by easterleggs

My Paia Oz has new 4013 chips, socketed, and a new amplifier chip. 
Before the repair, the lower half or so of the keyboard had fuzzy or
intermittent notes.  All notes but one are fine now.  The low F does
not produce any tone now.  Is it safe to assume this is a bad cap
upstream of the oscillator chips...in other words, something
associated with that particular key only?  I'd be curious to hear a
layman's explanation of the tone-producing pathway from the
perspective of a single key on the Oz...anybody wanna take a stab? 
Also, my volume pot has no effect.  The tone pot instead seems to
control the volume to some degree.  Anyone experienced anything
similar? Thanks for any help! --Stephen

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