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World of Ham Radio 1997
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1997-02-01
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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 <<<
==============================================================================
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 # 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.