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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 # 1001
MODEL: TS-950SDX
SUBJECT: Distorted DRU-2 TX Audio        

We have received several reports of minor distortion of the DRU-2 transmitted
audio when used with the TS-950SDX.  Recordings made from incoming received
sources do not appear to be distorted.   

Cause:  

This characteristic is caused by an impedance mismatch between the DRU-2
output and the input of the microphone amplifier circuit in the TS-950SDX.  
The following modification will correct/improve this characteristic.  

Procedure:

On the Microphone Amplifier Unit (X59-3710-01), which is part of Switch 
Unit (A) (X41-3240-00) (H/10):  (The Microphone Amplifier Unit is a small 
daughter board located on the switch assembly that has the Microphone 
Gain/Power Output Control and the Speech Processor IN/OUT controls.

1. Change chip resistor R257 from 4.7K to 8.2K ohms (RK73FB2A822J).
2. Change chip resistor R262 from 4.7K to 1.5K ohms (RK73FB2A152J).

        
Caution:  This modification requires soldering equipment rated for CMOS type
circuits.  It also requires familiarity with surface mount soldering
techniques.  If you do not have the proper equipment or knowledge do not
attempt this modification yourself.  Seek qualified assistance.

Time required for this modification is 30 minutes or less.