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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 # 845
MODEL: TR-8400
SUBJECT: RX INTERNAL SPURIOUS SIGNALS
Receiver internal spurious signals occurring at xx1.7MHz
and xx6.7MHz may be reduced or eliminated by adding an
additional ground and bypass capacitor in the PLL. These
are third overtone (21.6MHz) products of the PLL IF (7.2MHz).
This applies to all units before S/N lllxxxx.
PROCEDURE
1. Remove the top cover (4 screws).
2. Remove the rubber conductive shield.
3. Remove the aluminum cover from the PLL unit X50-1670-xx
(17 screws).
4. Solder a jumper between the DBM and VCO
compartments.
5. Solder a .01pf 50V disc ceramic capacitor (CK45FlH103Z)
from the DBM shield to the case of Q4 (3SK76 or 3SK92).
6. Reverse steps 3-1 to reassemble.
NOTE: Installation time for this procedure is 1/2 hour or less.