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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 # 814
MODEL: TR-2400
SUBJECT: UNLOCK


For apparent unlock, or either RX or TX failure, suspect not PLL unlock,
but low RX or TX XTAL activity.  Adding or replacing circuit components and
retuning the oscillator will cure the problem.

For No RX

Suspect low XTAL activity for X1 on the RX TX unit.  At Q1 add 7-12 pf bas
to emitter.  At Q5 replace L5, 22 uh with a 15 uh choke, L40-1501-05.
Adjust TC1 for 42.6 MHz in RX.

For no TX

Suspect low XTAL activity for X2.  At Q4 add 7-12 pf bas to emitter.
Replace L15, 22 uh with a 15 uh choke, L40-1501-05.  Adjust TC2 for exact
146 MHz transmit frequency.  At the base of Q4, also check L2 for
intermittent shorting against the Display unit mounting screw.