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World of Ham Radio 1997
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WOHR97_AmSoft_(1997-02-01).iso
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asb1053.txt
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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 # 1053
MODEL: TS-950SDX
SUBJECT: Change of Gate Resistor Type
Symptom: If the final amplifier is operated at excessive transmit levels
(over 150 watts output) the final FET's may fail and short from Source
to Gate. If this occurs, the bias resistors used in this circuit may be
damaged and cause a large amount of smoke to be emitted from the final
compartment.
Corrective Action: Change the carbon type resistors used for R17 and R18 to
fuse type resistors. This will prevent an unpleasant odor and smoke from
the final compartment.
Parts Required:
Qty Description New Part No. Circuit Description
2 100 ohm 1/2 watt Fuse Resistors R92-1310-05 R17, R18
Procedure: Remove the old resistors from their locations on the circuit
board and install the new resistors directly between the Gate and Source
of the final transistors.
Caution: If you do not have the proper equipment or knowledge do not attempt
this modification yourself. Seek qualified assistance from your closest
Kenwood Service Center (Long Beach, CA, or Virginia Beach, VA).
Time required for this moditication is 60 minutes or less.
Service code A:14 B:X45-3450-00 C:R17 18 D:91