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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 # 57
MODEL: SM-220
SUBJECT: SHIELD INSTALLATION
                                                        
   For Sweep interference from the SM-220 back into either a TS-520,
   or TS-180S, install an additional shield in the RF compartment in
   the SM-220
   
   1. Disconnect the power cord from the back of the scope.
   
   2. Remove the scope top cover.
   
   3. Loosen the Function and RF ATT shaft couplers using a 1.5mm
      allen key. Withdraw the shafts away from the RF compartment.
      
   4. Remove RF compartment screws from the rear panel.
   
   5. Remove 4 screws to open the RF comp.
   
   6. Remove one screw to remove internal shield.
   
   7. C6, a .01uF, runs from the Function Switch to a ground point
      under the RF ATT switch. Cut the ground lead and shorten so
      the cap is grounded to the ground point under the function switch.
      
   8. R2, a 10k ohm, is attached to the terminal strip directly under
      the function switch. Reposition this resistor from the top of
      the terminal strip to the bottom of the strip.
      
   9. Install the additional shield to the ground point under the
      function switch.
      
  10. Reverse disassembly procedure to reassemble.