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                             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   <<<
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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 # 962
MODEL: TS-950S/SD
SUBJECT: Early Protection With TL-922 

The TS-950SD RX to TX switching time in semi break-in is approximately 
10mS. At key down, the transceiver momentarily sees an open circuit 
because the linear's keying relay has not engaged. As a result, the 
transceiver's protection circuit turns on, causing the output power to 
be reduced. The following modification will make the RX to TX switching 
time, in semi-break-in, approximately 30mS. This modification does not 
affect full break-in switching. Increasing the switching time to 30mS 
may restrict certain long distance high speed communications.


REQUIRED PARTS:

DIGITAL TRANSISTOR	(QTY 2)			PART # DTC124ES
100K OHM, 1/4W RESISTOR				PART # RD14BB2E104J
2.2uF, 50V ELECTROLYTIC CAPACITOR		PART # CE04EW1H2R2M

1. Disconnect the power cord and antenna.

2. Remove the top and bottom covers (18 screws).

3. Remove the top screw from each side of the front panel assembly.

4. Loosen the bottom screw on each side of the front panel assembly.

5. Pull the front panel assembly forward to expose the Digital and 
   Control boards.

6. Remove the two screws that secure Control board B/3 to the top of 
   the chassis and swing the board out of the way.

7. Remove the 4 screws from Control board A/3 and rotate the board down. 
   Disconnect the right hand plugs as necessary to expose the foil side 
   of the Control board.

8. Install the circuit shown in figure 1 on the foil side of Control 
   Board A/3.

9. Assemble the transceiver by reversing steps 1 - 7.

                                   +
                        /--- 2.2UF -----> TO PIN2 IC-10
                   b  c/
                 /--!-|
          b   c/    | e\
   CN8-3 <----|     |   |
              e\    |  GND
                \   |
                |   |----------100K-------->TO CN8-7 (15V)
               GND


This modification is covered under the 1 year warranty.
Time required to perform this modification is 1hr. or less.