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World of Ham Radio 1997
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WOHR97_AmSoft_(1997-02-01).iso
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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 # 1037
MODEL: TH-28A/TH-48A
SUBJECT: CTCSS Tone Error
Symptom: Several reports were received on early model TH-28/48's concerning
an inability to access subaudible tone controlled repeaters. This symptom
only occured when the repeater required the use of any of the following tones:
131.8 Hz
136.5 Hz
173 8 Hz
Corrective Action: A microprocessor software error is responsible for this
symptom. Replacing microprocessor IC6 on board X53-3400 (TH-28) or
X53-3410 (TH-48) with the part listed below will correct this symptom.
Parts Required:
Qty Description Old Part No. New Part No. Circuit Description
1 Microprocessor HD404629A73H HD404629A79H IC6
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: 29 B: X53-340 or X53-341 C: IC6 D: 91