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   rec.audio.tech      Theoretical, factual, and DIY topics in      41,683 messages   

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   Message 41,045 of 41,683   
   Jack to Jack   
   Re: Troubleshooting Pioneer SX-838 recei   
   21 Jul 12 16:47:17   
   
   From: @noway.com   
      
   Jack wrote:   
   > Jack wrote:   
   >> Well... after switching channels between the push button input selector   
   >> board and the tape monitor board, the bad channel switches from left to   
   >> right. This indicates to me that push button switches are the problem.   
   >> However, when I use the tape playback inputs on the back of the unit and   
   >> flip the appropriate tape monitor flip switch, the problem continues.   
   >> The tape monitor switch switches on the tape playback jacks and switches   
   >> off all input from the pushbutton switches. I will have to look at the   
   >> schematics and try to puzzle out this behavior.   
   >   
   > Okay, I totally disconnected the signal wires going from the pushbutton   
   > switch circuit board to the tape monitor switch circuit board and I am   
   > playing from the computer through the tape play back jacks. Both   
   > channels are playing fine at the moment, but being that the problem is   
   > intermittent without any way to induce it (that I know of) I will just   
   > have to wait a see again.   
      
   With the two signal wires from the push button switch board disconnected   
   from the tape monitor switch board, the right channel went out while in   
   tape monitor mode....(many minutes later) just found a likely suspect...   
   the -20 db circuit board and the pushbutton switches mounted on it. It   
   is right next to the push button input switch circuit board and is   
   dragged down with it when I push down on that board with a chopstick.   
   The bad channel is much more responsive to pushing down on the -20 db   
   circuit board than on the push button input switch circuit board, and   
   pushing the -20 db switch exactly mimics what happens when the channel   
   goes out... volume on that channel drops way down but is still   
   responsive to the volume control. I FOUND IT!!!   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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