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World of Ham Radio 1997
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WOHR97_AmSoft_(1997-02-01).iso
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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 # 1057
MODEL: TH-22AT/TH-42AT
SUBJECT: Memory Loss Improvement
Symptom:
Memory loss can occassionally occur if the following procedure is observed:
1. Program the memory with any desired information.
2. Allow the battery pack to drain down over an extended period of time
without turning off the transceiver. For example turn the volume control up
and the squelch off. After approximately 8 hours the battery voltage will
drop to approximately 3 - 4 vdc.
3. Turn off the POWER SW.
4. Connect a DC voltage supply or a fully charged battery pack.
5. Turn on the POWER SW.
6. Memory will have been lost.
Corrective Action:
Replace microprocessor IC206 with the improved part listed below.
This part incorporates a software improvement to correct this symptom.
Parts Required:
Qty Description Old Part No. New Part No. Circuit Description
1 Microprocessor HD404629B17TF HD404629B49TF IC206
Time required for this modification is 60 minutes or less.
Service code A:34 B:X57-347X-XX C:IC206 D:91