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World of Ham Radio 1997
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WOHR97_AmSoft_(1997-02-01).iso
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==============================================================================
K E N W O O D
>>> A M A T E U R R A D I O S E R V I C E B U L L E T I N <<<
==============================================================================
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
==============================================================================
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.