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                             K E N W O O D
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                        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

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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