From: chuck23@dejanews.net   
      
   On Thu, 14 Mar 2024 20:56:32 +0000, liz@poppyrecords.invalid.invalid   
   (Liz Tuddenham) wrote:   
      
   >I was asked to repair a Pioneer QX-949 quadraphonic tuner/amplifier.  It   
   >is a complex beast and one channel had gone down to almost nothing.   
   >Luckily the service sheet was available and I traced the fault to the   
   >board which houses the tone controls and filters.   
   >   
   >The gain is in two stages with the tone controls around the second   
   >stage.  On one of the channels, the voltages on the single transistor   
   >for that stage were all wrong.  After lifting the transistor off the   
   >board, it became apparent that the base bias was far too high and the   
   >finger of suspicion pointed to the inter-stage coupling capacitor   
   >feeding in leakage current from the preceding stage.   
   >   
   >I tested the capacitor, which was marked "4.7".  It read exactly 4.7k in   
   >both directions on an ohm-meter !!!   
      
   Was it a light blue Sanyo?   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)