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World of Ham Radio 1997
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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 # 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.