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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 # 845
MODEL: TR-8400
SUBJECT: RX INTERNAL SPURIOUS SIGNALS
                                                        
     Receiver internal spurious signals occurring at xx1.7MHz
     and xx6.7MHz may be reduced or eliminated by adding an
     additional ground and bypass capacitor in the PLL. These
     are third overtone (21.6MHz) products of the PLL IF (7.2MHz).
     
     This applies to all units before S/N lllxxxx.
     
     PROCEDURE
     
     1. Remove the top cover (4 screws).
     
     2. Remove the rubber conductive shield.
     
     3. Remove the aluminum cover from the PLL unit X50-1670-xx
          (17 screws).
          
     4. Solder a jumper between the DBM and VCO
          compartments.
          
     5. Solder a .01pf 50V disc ceramic capacitor (CK45FlH103Z)
          from the DBM shield to the case of Q4 (3SK76 or 3SK92).
          
     6. Reverse steps 3-1 to reassemble.
     
     NOTE: Installation time for this procedure is 1/2 hour or less.