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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 # 881
MODEL: TS-930S
SUBJECT: POWER SUPPLY SURGE PROTECTION
A line surge (exceeding approximately 4.5KV) due to static electricity
or nearby lightning discharge may short power relay diode,D2 (V06E),
and cause electrolytic capacitor C14 (3.3 uf) to break down.
This results in relay chatter and the relay contacts may finally weld.
Addition of the surge absorber to the primary power supply input circuit,
should help avoid this type of failure.
NOTE: This symptom has occasionally occurred in those limited areas
subject to frequent and violent lightning discharges.
A good earth ground and antenna system lightning protection is
still strongly recommended.
ADD PART D9 (ERZClODK431) ACROSS THE AC LINE INPUT
Note: This change applies to units before S/N 3080301.