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Text File  |  1991-03-10  |  977b  |  29 lines
  1. TS140S.1
  2.  
  3.                 TS140/680 Service Tip
  4.  
  5.         After replacing finals and/or drivers in the TS140/680
  6. check that all filter relays are operating correctly. Failure
  7. of a band's relays to pick will cause the finals to run into an
  8. open circuit and possibly (probably?) damage them.
  9.  
  10.         Check the following points for approximately 12 volts.
  11. These diodes are on the filter board next to the final unit.
  12.  
  13.  Band          Diode           Band          Diode
  14.  1.8            D1             24.0           D6
  15.  3.5            D2             28.0           D6
  16.  7.0            D3             28.5           D6
  17. 10.0            D4             29.0           D6
  18. 14.0            D4             29.5           D6
  19. 18.0            D5             50.0 - 54.0    D7  TS680 only
  20. 21.0            D5
  21.  
  22.         If the problem is in the 1 of 10 decoder chip IC2 on the
  23. signal board (74LS145) unlock problems may also occur.
  24.  
  25.         Fred Burton .. @ VE3HPL
  26.  
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  29.