==============================================================================
                             K E N W O O D
   >>>   A M A T E U R   R A D I O   S E R V I C E   B U L L E T I N   <<<
==============================================================================

                        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

==============================================================================

BULLETIN # 815
MODEL: TR-2400
SUBJECT: PULSE NOISE
                                                        

For elimination of pulse type noise, either in receive, induced by the

LCD oscillator, or in transmit, induced by stray RF in the H.T., install

additional chokes and a capacitor as detailed.

DISASSEMBLY:

1. Disconnect the battery pack and remove from the unit.

2. Remove the 4 case screws, plus two battery pack compartment screws.

3. Seperate the front and rear halves of the radio. DO NOT TEAR WIRES!

4. Unscrew two screws and two threaded retainers holding the PLL unit
   X50-1640-10. Slide the unit down to clear the three push switches
   from the top panel.
  
5. Seperate the PLL and RX TX unit. Remove the fish paper insulation from
   between the two boards
   
TX RF NOISE:

1. On the RX TX unit, locate the battery ground (BLACK) lead soldered to
   the right edge of the PCB. Desolder this line and install a choke with
   ferrite bead L33-0632-05 Resolder along the bottom edge of the board,
   as shown.
   
2. Also on the RX TX unit, locate the YELLOW lead attached to the foil side
   of the charge jack J1. Install a .001uF capacitor across J1 to ground
   as shown
   
TX OR RX LCD PULSE NOISE:

1. On the display unit X54-1480-10 locate the YELLOW lead marked B+. Desolder
   this lead and install a lJuH choke L40-1021-03 in series. Lead dress MUST
   be as shown for physical clearance.
   
2. Also on the Display unit, adjacent to the B+ lead, desolder the GREEN
   E (earth) lead and the BLACK E lead, and wire as shown to another luH
   choke, L40-1021-03. Again, observe physical parts placement for clearance.
   
3. For reassembly, reverse steps 5 through 1. If components were installed
   as specified, there will be no clearance problems.