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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 # 802
MODEL: RM-76
SUBJECT: MICROPROCESSOR FAILURE
When servicing an RM-76 for IC5 failure, also check pin 39 vdd voltage,
which should be approximately 6vdc. Higher voltage will lead to premature
second failure. An incidental symptom for this problem would be such
reports as all "8's" before total failure.
Replace IC5 and IC2, NJM78L06A, the 6v regulator for the microprocessor.
Also check IC1, FS7806M, which supplies regulated 6v for all other
sections. Failure of this regulator (at about 10v dc) will give all logic
hi's.
JEB/yn
(c) 2880TKC