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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 # 1010
MODEL: AT-50
SUBJECT: Blows ACCY Fuse in TS-50S
Symptom:
Attempting to tune the AT-50 when it is connected to an antenna with a
relatively high SWR value might cause the ACCY fuse to open in the TS-50S.
This change will correct this tendency.
Parts Required:
Qty Description Kenwood Part No.
2 .047 uf Disk Ceramic Cap CK45B1H473Z
Procedure:
1. Remove the top cover from the antenna tuner.
2. Locate X53-3470-00 D/4 (It is attached to the top left side of the
chassis with the foil side up.)
3. Add the two .047 uf capacitors across D303 andode and gate to Ground as
shown in the drawing.
4. Replace the top cover.
No additional adjustments or modifications will be required.
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:01 B:X53-3470-00 C:ADDC D:91