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World of Ham Radio 1997
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WOHR97_AmSoft_(1997-02-01).iso
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asb1019.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 # 1019
MODEL: TS-950
SUBJECT: Low Power Output after Temp. Protection
Symptom:
After transmitting for approximately 2 hours at 50% duty with 150 watts output
the temperature protection circuit activates reducing the output power to
about 50 watts. Normally, full output power will be restored after the fans
have had a chance to cool things down. Occasionally the power output will
not return to normal, even after extended receive operations.
Cause:
The temperature sensor is attached to the main transformer and is set to
activate at 80 degrees C. This setting was selected to reduce power before
the internal fuse on the transformer opens.
Corrective Action:
After thorough testing, we have found that the temperature sensor should be
set to 90 deg C to allow proper return to full power transmit. This setting
will also allow the radio to be used at higher ambient room temperatures
without worrying about the power output dropping in the middle of a QSO.
Replace S1 the temperature sensor.
Parts Required:
Qty Description Kenwood Part No. Circuit Description
1 90 deg C Thermal switch S59-1416-05 S1
Caution: This modification requires soldering equipment rated for CMOS type
circuits. It also requires familiarity with surface mount soldering
techniques. If you do not have the proper equipment or knowledge do not
attempt this modification yourself. Seek qualified assistance.
Time required for this modification is 30 minutes or less.
Service code A:93 B:20 C:S1 D:91