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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 # 926
MODEL: TW-4100A
SUBJECT: REPEATER STOP SCAN ON THE UHF BAND

During repeater cross band operation, the TW-4100A may not detect a UHF
signal while it is alternating between the two bands. This is due to the
electric field generated by the strong UHF receiving signal causing the 
busy circuit to malfunction. The following modification will allow detection 
of the UHF signal.

REQUIRED PARTS:

	(1) RESISTOR 4.7K OHM, 1/8th WATT	PART # RD14BB2B472J
	(1) CAPACITOR, ELECTROLYTIC 4.7uF, 16V	PART # CE04CWlC4R7M
	(1) DIODE lS1555	                PART # V11-0076-05

1. Remove the 4 screws securing the top cover.

2. Remove the 10 screws securing the bottom cover.

3. Carefully remove the top and bottom covers. Do not damage the speaker 
   cable attached to the bottom cover.

Refer to FIGURE 1 for the next 3 steps.

4. Locate connector number 12 on the Composite unit (RX-TX) on the bottom 
   of the transceiver.

5. Carefully strip 1/8 inch of insulation from the wire attached to pin 2 
   connector 12 approxiamently 1/4 inch from the connector (do not break 
   the wire).

6. Solder the 3 components (listed above) between the wire and ground.  
   A good ground location is the can around TC2 and L8.

7. Assemble the transceiver by reversing steps 1 - 4.


Time required for this modification is 0.5 hrs or less.