From: JERONI.PAUL@terra.es   
      
   Saunderlin wrote:   
   > I am about to start repairs on a Kenwood ham radio that originally used    
   > Sonybond to secure several of its VCOs. The main VCO has become    
   > unstable and voltage exists within the Sonybond to ground, so it has to    
   > be removed.    
   >    
   > Initial recommendations from years past suggested carefully scraping or    
   > cutting away miniscule pieces until none remained all the while    
   > carefully preserving circuit components. Since the process is long and    
   > tedious, I wonder if any better ways have been developed for removing    
   > this stuff and preserving components? Thank you.   
      
   In one case even scraping/cleaning it did not fix the issue, apparently the   
   board had absorbed some bond and was slightly conductive by itself. I ended up   
   doing some mod to the circuit to reduce its sensitivity.   
      
   It was a board with a power amplifier IC and a power transistor used to cut   
   power to the IC when in stand-by. It had a small transistor to drive the base   
   of the big one and resulted in so much gain that some microamperes leaked   
   through the sonybond kept    
   both transistors turned on causing noises through the speakers when in   
   stand-by. I was tempted to remove the small transistor because the driving   
   signal had more than enough current to drive the power transistor directly   
   (then I would have had to invert    
   it somehow), but it was enough to add a pull down resistor to overcome the   
   sonybond leak.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)