Vintage Synth Repair

Hi Jim,
I used to live in Aldergrove, I now live in Nakusp.
We met 10 or 12 years ago through a mutual friend, Larry Vollans
I have been restoring old analog synths for over 20 years now, drop me an email if you need any more help.

Dave


--- In vintagesynthrepair@yahoogroups.com, Jim Blair  wrote:
 
 Hey thanks Dave.
 
 And yes, I do live on Vancouver Island.
 
 I operate a small recording studio that specializes in vintage keyboards.
 
 http://www.facebook.com/ApeIslandSound
 
 Are you in the area?
 
 
 Jim
 
 
 
 At 11:27 AM 12/17/2012, you wrote:
 
 
 Since all the other keys work, I would suspect 
 the problem is the key it's self.
 Does the ProDGX use a resistor or diode keyboard?
 Either way, check for a bad resistor/diode on 
 the suspect key, also look for cracked solder 
 joints, or possibly a short to the gate or after-touch buss.
 
 On a side note, do you live on Vancouver Island?
 
 Dave
 
 --- In 
 vintagesynthrepair@yahoogroups.com, 
 Jim Blair  wrote:
  
   Thanks for your reply, DT.
  
   No sample and hold on the ProDGX.
  
   The note does not stay at the correct frequency
   when held. The pitch drop happens immediately on "note on".
  
   J wires are aligned, and cleaned, as is the bar.
  
  
   Jim
  
  
   At 05:34 AM 12/17/2012, you wrote:
   
   
   Hi Jim,
   
   The fact that the rest of the keyboard works
   fine seems to rule out that the sample hold
   function is awry. Does the note stay at the
   correct frequency if you hold it down? Is it
   only pitch dropping on the release? Have you
   checked to make sure the Jwires are aligned
   properly on that key? Maybe open it up and check
   to ensure that the contact wires on that top key
   are aligned the same way as for all the others.
   If not, bend them back carefully to match the others.
   
   (but I'm not really a tech, so don't just listen to me).
   
   best DT
   
   --- In
    
  vintagesynthrepair@yahoogroups.com, 
 
   Jim Blair  wrote:
    
     Hello!
    
     Here's an odd one up for discussion. I have a Arp ProDGX. Everything
     works fine....except.....if I hit the top key (highest note) it
     briefly plays the note, then very quickly drops down to a much lower
     note (almost instantaneously). After this little event, every key
     stops working, other than a click for each note.
    
     This happens on every patch.
    
     Then, if I turn the power off, then back on, everything is fine again
     until the next time I hit that highest note.
    
     Any suggestions on where to point my screwdriver and multimeter?
    
    
     Thanks,
    
     Jim Blair
     Ape Island Sound
    
    
  http://www.facebook.com/ApeIslandSound http://www.facebook.com/ApeIslandSound
    
   
   
   
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