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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 # 862
MODEL: VFO-120
SUBJECT: Dial Lamp Switching Cirouit

When operated with a TS-120s series transceiver, the dial lamp on the 
external V.F0 will remain on if the power supply remains on, even though 
the transceiver is off. Adding a transistor switch on the VF0-120 Switch 
Unit X41-l240-00 will provide automatic lamp operation from the transceiver 
power switch.

On the Switch unit, add transistor Q1, 2SCl959(Y) (V03-1959-05) as a 
pilot light ground switch, controlled by the transceiver 9V DC llne. 
Connect Q1 emitter to ground, collector to the pilot light ground (either 
the lead, or connector CJ-2, pin 2) and the base through a 4.7k ohm 
resistor (R9) (RD14BB2E472J) to the 9 volt line.
 
Note: 1. This change may be applied to units before serial number 110001.

      2. Installation time for this procedure is 1/2 hour or less.


          ---R3---LAMP --   ---GROUND
                        |   |
                        |   |
                       c \ / e      
                          -       2SC1959(Y)
                          |b       
      9v <------4.7k------|