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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 # 932
MODEL: TSU-6
SUBJECT: TONE ALERT IMPROVEMENTS

When using the TH-25/45 in combination with the TSU-6 you may experience 
erratic operation of the tone alert function. This may be due to an 
incoming signal that is over-modulated, distorted, or noisy.
The following modification will correct this tendency.

REQUIRED PARTS:

	22uF, 6.3V ELECTROLYTIC CAPACITOR	PART # CE04CWOJ220J
	56K OHM, 1/8W CARBON RESISTOR	        PART # RD14BB2B563J
	DIODE	                                PART # 1SS133

1. Remove the TSU-6 from the TH-25/45 (refer to the TH-25/4 instruction 
   manual for details).

2. Cut the blue wire (pin # 4) approximately 5mm from the the connector 
   for the TSU-6.

3. Solder the components to the blue wire and ground as shown in figure 1. 
   Note that the cathode side of the diode goes towards the TSU-6 connector. 
   Use the leg of the VCO shield to ground ths negative side of the capacitor.

4. Insulate the components with electrical tape to prevent shorting.

5. Install the TSU-6 in the TH-25/45. Route the components so that the 
   battery terminal plate does not bow when installed.

Time required for this modification is 0.5 hrs or less.