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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   <<<
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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 # 903
MODEL: TR-2600A
SUBJECT: PLL Unlock 


Some cases of PLL unlock on the TR-2600 may be caused by a failure of the
crystal oscillator circuit X2, X3, and Q13.  This may be corrected by
performing the following changes.

On the TX unit (X56-1470-10)

Replace diodes D13 and D14 (MA856) wit a series pair of BA282 diodes.  Also
change resistor R54 to 47 ohms.

Parts required:

BA-282 diode        4 each.
47 ohm chip resistor (RD73FB2A470J) 1 each

This change is applicable to serial numbers before SN 702XXXX.
Time required for this modification is 1 hour or less.