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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 # 855
MODEL: TR-8400
SUBJECT: Transmit Delay Time


PLL lockup time when switching from receive to transmit may be shortened
for faster transmitter response.  This change applies to units before
serial number 1060455.

On the PLL unit X50-1670-xx, check the values of R31 (390 ohm) and C47, C48
(6.8uf) near Q7 and Q8.  If these component values differ, change as
required.  This will give approximately a 0.12 second delay, which should
be satisfactory for practical use.  However, if shorter delay is required,
replace R31 with an 820 ohm resistor.  This will yield an approximate 0.096
second turn-on delay.

No adjustment is required after this part change.

Note:  When R31 is 820 ohms, CTCSS (Subtone) will be slightly distorted.

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