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World of Ham Radio 1997
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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 # 971
MODEL: TS-950S/SD
SUBJECT: RECEIVER NOISE
About 1mV of noise is present at the speaker or headphone jack in the
receive mode with the AF GAIN control set to minimum. If the transceiver
is in the CW mode, a faint tone might also be heard through the headphones
(sidetone leakage). The following modification will reduce the level of
the noise and the tone.
REQUIRED PARTS:
2SD1757K(S)
1. Disconnect the power cord and antenna.
2. Remove the top and bottom covers (18 screws).
3. Locate the AF unit on the bottom of the transceiver. This is the
front left board of the four boards on the bottom of the transceiver.
4. Remove the screws from the AF unit and disconnect the plugs as
necessary to turn the board over to expose the foil side of the board.
5. Replace Q6 with a 2SD1757K(S).
6. Solder a 22 AWG jumper wire as shown in figure 1.
Time required to perform this modification is 1 hr. or less.