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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 # 830
MODEL: TR-2400
SUBJECT: TX NOISE
                                                              
     Some units may exhibit excessive background noise (up to
     several hundred Hertz deviation). This may be reduced or
     eliminated by installing an additional shield between the
     Display and PLL units
     
     This changes applies only to units between serial numbers
     011xxxx and 101xxxx. Radios before this group (with a momentary
     REV switch) will not show improvement by addition of this
     shield. Refer to Service Bulletin 815 for this early group.
     
     Units appearing with serial numbers after 101xxxx will have
     this shield factory installed.
     
     Parts supplied
     
     N09-0627-05 Pan head screw 3 pcs.
     
     F10-1627-04 Shield w/lead 1 pc.
     
     Procedure:
     
     1. Remove 4 rear case screws, and 2 screws from inside the
        battery compartment.
        
     2. Seperate front case from body. DON'T tear leads.
     
     3. Remove 2 small and three large screws from the bottom edge
        of the Display unit. Save the two small screws.
        
     4. Install the three pan head screws in place of the round
        head screws.
        
     5. Install the shield foam towards the Display. Lift the
        protective plastic only enough to secure the shield with
        the two small screws. Cover the screw heads with the plastic
        film.
        
     6. Secure the shield ground under the small Phillips screw
        located between the BUSY/OPEN and S TONE switches.
        
     7. When reassembling, the wiring harness must be positioned to
        the right of crystal X2 (46.1666MHz) or the case will nne
        close correctly, and wires will be pinched.
        
     8. Close the case and reinstall 6 screws.