From: @noway.com   
      
   Dave Platt wrote:   
   > In article , Jack  <@noway.com> wrote:   
   >   
   >> Given the behavior described above I can only guess that a rise in   
   >> voltage in the main amp produced by turning up the volume with the   
   >> speakers turned off somehow corrects the condition causing this problem,   
   >> but at the moment I don't know what this condition might be.   
   >   
   > One thing to suspect in cases like this, is a bad electrolytic   
   > coupling capacitor between one stage and the next.   
   >   
   > Bad output-protection relays can also cause this sort of "turn it up   
   > far enough and it starts working" problem.   
   >   
   > Usual next step is to use a signal tracer / oscilloscope, and see how   
   > far through the output circuitry you can detect audio when it's in the   
   > "not working" condition.   
   >   
   Hi, Dave, thanks for the suggestions... I just opened up the unit and   
   have it sitting here in front of me and I was just about ready to do as   
   you suggest, see how far through the circuit the signal goes, except   
   that I don't have a signal generator. I plan to just turn the unit   
   ontune in to an FM station and probe for voltages. On the schematics I   
   see where the output from the power transistors goes through the relay   
   before going to the speakers. I plan to probe both sides of the relay to   
   see what I get. I will post the results.   
      
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