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World of Ham Radio 1997
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asb1033.txt
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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 # 1033
MODEL: TM-742A/TM-942A
SUBJECT: Microprocessor Change
Symptom:
Reports of problems with microprocessor lock-up when using S-meter squelch,
problems with storage/recall of PL tone frequencies of 203.5 Hz. and/or
114.8 Hz., or problems with a lack of transmit on the UHF band modules
during Remote operation can be corrected using the changes noted in this
bulletin.
Units that exhibit any of these symptoms with serial numbers between 412XXXX
and 507XXXX need only change IC1 on X53-3460-21 B/2. Units that exhibit
any of these symptoms with serial numbers of 412XXXX and below must also
change IC1 on X54-3130-11. Units with serial numbers of 507XXXX and greater
have had these changes incorporated in production.
Parts Required:
Qty Description Old Part No. New Part No. Circuit Description
1 Microprocessor HD6433388A07F HD6433388A22F IC1
or
HD6433388A14F
1 Microprocessor HD404719A26H HD404719A32H IC1
Caution: This modification requires advanced surface mount soldering equipment
that is rated for CMOS circuits. It also requires familiarity with advanced
surface mount soldering techniques. If you do not have the proper equipment
or knowledge do not attempt this modification yourself. Attempting to remove
and replace either IC without the proper equipment and techniques can easiy
damage the circuit boards and void your warranty.Seek qualified assistance
from your closest Kenwood Service Center:
Long Beach, CA, or Virginia Beach, VA.
Time required for this modification is 90 minutes or less.
Service code A:98 B:X53-346 B/2 C:IC1 D:91