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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   <<<
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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 # 999
MODEL: TS-950SDX
SUBJECT: No Beep in Headphones

Background:

Several owners of the TS-950SDX have reported the absence of an audio 
confirmation tone when using monaural headphones.  The tone is present 
when listening with stereo headphones but only from the right hand speaker 
element.

Cause:	

In this design the SUB AF PA circuit supplies audio when using a monaural 
headphone, and the MAIN AF PA supplies audio to the right speaker of a 
stereo headphone.  The audio confirmation tone is not applied to both the 
SUB AF PA and the MAIN AF PA. To simplify circuit design the tone is only 
routed to the MAIN AF PA.   Unfortunately this left monaural users without 
a confirmation tone and stereo headphone users with a confirmation tone 
only in the right side of the headphones. 

Corrective Action:     

The following modification permits the user to hear the audio confirmation 
tone from both sides of a stereo headphone and from a monaural headphone.

WARNING:  This radio uses micro-sized surface mount components, and/or 
multi-layer circuit boards.  If you are not familiar with the techniques 
for service of this type of equipment do not attempt this modification 
yourself.  You will invalidate your warranty if you attempt to modify the 
equipment and damage the radio.   If you are at all in doubt about your 
qualification to perform this modification you should seek qualified 
assistance.
 
Required Parts:

R138: 100K radial lead 1/4 watt resistor RD14BB2C104J
Procedure:
1. Unplug the DSP Unit from the rear of the transceiver.
2. Remove the top and bottom covers (18 screws.)
3. Remove one screw from each side of the front panel and tilt the front 
   panel forward.
4. Add R138 from the wiper arm of VR1 to the negative side of C39. Use
   insulating tubing on the resistor leads. 
5. Reverse steps  1 through 3  to reassemble.

This modification may be covered under warranty. 
Time required for this modification is 1 hr or less.