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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 # 859
MODEL: TR-9000
SUBJECT: Temperature Stability Improvment

PLL noise or unlock at high temperature may be cured by changing a 
mixer feed point in the PLL.

Measure TP3 on the PLL unit. If greater than 0.5V RMS signal is available, 
this change will not be required. If less than this level is present, 
the following procedure may help the problem.

On the PLL unit X50-1620-00 at Q13: 
1. Remove and delete C23. 
2. Connect Q13 emitter to L5 "hot" (original C23 take-off.) 
3. Realign L5, 6, 7 for at least 0. 5V RMS at TP3 .

Note: Installation time for this procedure is 1/2 hour or less.

Alignment Note: To align L6 & 7, first position the slugs flush with 
the tops of the coils, then alternately adjust these two coils for 
maximum output at the first peak into the coil( fundamental frequency). 
Then align L5 for maximum.