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                        Kenwood Service Centers

   Kenwood Service Corporation             Kenwood Service Center, East
   2201 East Dominguez Street              829 Lynnhaven Parkway, Suite 130
   Long Beach, California 90801            Virginia Beach, Virginia 23452
   Telephone 1-310-639-5300                Telephone 1-804-340-1702

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BULLETIN # 831
MODEL: TS-120S
SUBJECT: ANT INPUT TRANSFORMER REPLACEMENT
      
     TS-120S Ant Input Transformer Replacement: New Part
     Supercedes bulletin 7/12/79
     
     Transceivers subject to strong static fields, high RF, or
     similar high current atmospheric discharges may suddenly
     exhibit low sensitivity on all bands. TX will not be affected.
     Suspect T1 on the RF unit, X44-1260-01.
     
     When replacing T1, L43,0696-35, check that the value of C20 is
     33pf. Early units may have a l5pf for C20, and may have T1 as
     L43-0696-05. In either case, replace the transformer with an
     L34-0929-15. If C20 is 15pf, replace it with a 33pf capacitor.
     Since T1 is a broadband transformer, no adjustment is necessary.
     
     In addition, add two lS1587 diodes after the transformer as
     shown to further protect the receiver.
     
     Installation time for this procedure is approximately 1/2 hour.