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World of Ham Radio 1997
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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 # 831
MODEL: TS-120S
SUBJECT: ANT INPUT TRANSFORMER REPLACEMENT
TS-120S Ant Input Transformer Replacement: New Part
Supercedes bulletin 7/12/79
Transceivers subject to strong static fields, high RF, or
similar high current atmospheric discharges may suddenly
exhibit low sensitivity on all bands. TX will not be affected.
Suspect T1 on the RF unit, X44-1260-01.
When replacing T1, L43,0696-35, check that the value of C20 is
33pf. Early units may have a l5pf for C20, and may have T1 as
L43-0696-05. In either case, replace the transformer with an
L34-0929-15. If C20 is 15pf, replace it with a 33pf capacitor.
Since T1 is a broadband transformer, no adjustment is necessary.
In addition, add two lS1587 diodes after the transformer as
shown to further protect the receiver.
Installation time for this procedure is approximately 1/2 hour.