==============================================================================
                             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 # 1050
MODEL: TS-950SDX
SUBJECT: Sub Band Residual Noise 

Symptom: The level of residual noise (AF VOL at Min) on the SUB band is 
slightly higher than that of the MAIN band. This is especially true at 
audio frequencies of around 50 Hz, as viewed on a spectrum analyzer. 
As a result the SUB receiver is more susceptable to motor noise, such as 
might be generated by fans, refrigirators, etc.

Countermeasures: Replacing the Control Unit electrolytic capacitors 
(C33, C34, and C39) with Tantalum capacitors, and adding the bypass 
capacitor to the Switch unit reduces or eliminates this symptom.

Parts Required:

Qty	Description             Kenwood Part No.       Circuit Description
				
1	0.1 uF 35vTantalum cap	C92-0001-05            C33
1       1.0 uF 16v Tantalum cap C92-0004-05            C34
1       10 uF 16v Tantalum cap  C92-0505-05            C39
1      .01 uF disc capacitor    CK45B1H103Z            NA


Procedure:

Replace C33,C34,C39 with the new capacitors listed above. The components 
will be located on the Control Unit (X53-3380-00) foil side. 

On Switch Unit (X41-3250-00 B/10) cut the trace from one end of VR2 and
add the .01 disk across the cut. The proper trace is the longest one.


                      Cut and Add Cap.
                        \
                     |||| ||||||||||
                     ||    ||     || 
                     || oo ||  oo ||   
                        ||     || || 
                        |||    || |||| 
                          ||   ||   ||
                          ||    ||  ||  
                          oo    oo  oo    
                        End    Cent  End
                              VR2
Caution: This modification requires advanced surface mount soldering 
equipment that is rated for CMOS circuits. It also requires familiarity 
with advanced surface mount soldering techniques. If you do not have the 
proper equipment or knowledge do not attempt this modification yourself. 
Seek qualified assistance from your closest Kenwood Service Center 
(Lonq Beach, CA, or Virginia Beach, VA).

Time required for this modification is 60 minutes or less. 
Service code A:09 B:X53-3380-00 C:C33, 34, 39 D:91