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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 # 883
MODEL: TS-430S
SUBJECT: AM WIDE/NARROW FILTER SELECTION

This procedure will allow selection of the Wide or the Narrow filter for AM.

PARTS LIST

	QTY	DESCRIPTION                CIRCUIT DESIGNATION
	2	2SA1115(E) Transistor         Q401, Q402
	4	lS1555 Diode                  D401-D404
	1	4.7k ohm 1/8 watt             R405
	2	22R ohm 1/8 watt              R403, R404
	2	47K ohm 1/8 watt              R401, R402
        Insulated hookup wire #28 guage      J401, J402, J403
	1	Short Jumper

MODIFICATION PROCEDURE:

CAUTION: THIS MODIFICATION REQUIRES ADVANCED SOLDERING AND PRINTED 
CIRCUIT BOARD MODIFICATION TECHNIQUES, AND SHOULD ONLY BE PERFORMED 
BY EXPERIENCED KIT BUILDERS AND OR TECHNICIANS. IF YOU ARE AT ALL 
UNSURE OF YOUR ABILITY TO INSTALL THIS MODIFICATION AFTER READING 
THESE INSTRUCTIONS, PLEASE HAVE SOMEONE WITH MORE EXPERIENCE PERFORM 
THE MODIFICATION FOR YOU.

1. Remove the power connector from the radio.

2. Using a #2 Phillips screwdriver, remove the top cover (8 screws). 
   Be careful of the VOX controls, and the speaker lead, which may be 
   unplugged.

3. Loosen the two countersunk side screws and remove the 2 screws securing 
   the IF unit bracket. Swing the bracket up slightly to access and 
   remove the two heat sink screws. Swing the assembly down.

4. Remove 7 screws trom tne IF unit. Protect the top of the front panel 
   from scratching.

5. Desolder IB1 and discard (use a 45 watt or less iron, and solder wick). 

6. Locate the white jumper wire that is plugged on to the "S" terminal of 
   the IF unit. Desolder the wire from its present location, and reinstall 
   as shown in figure 1. 

7. Install a short jumper wire, as shown in figure 1. 

8. Cut the foil paths as shown in figure 2. There are five locations that 
   must be cut. 

CAUTION: Ensure you cut only the traces as shown in the figure. Spend a 
         little extra time to ensure you have correctly identified the 
         trace to cut.

9. Install J401, J402 (may all ready be installed), J403, D403, D404, 
   R403, R404, and R405 as shown in figure 2 (use the shortest lead 
   lengths possible). Check to ensure there are no solder bridges, or 
   splashes on the board.

10. Install Q401, Q402, R401, R402, D401, and D402 as shown on figure 2, 
    again being careful to check for solder bridges, shorts, etc.

11. Check to see if D82 is installed, as shown in figure 1. If it is not, 
    install it (1S1555). D83 should also be installed on the foil side of 
    the board, as shown in figure 2.

Note: Some units have D82 and D83 installed, if so go to step 12.

12. Move the filter select jumper to the "A" pin, as shown in figure 1.

13. On Control Unit (X53-1290-00), cut the lead of resistor R129.

14. Solder a jumper wire to the metal lead of resistor R129, as shown in 
    figure 5. Connect the other end to IF Unit connector 18 pin 2 from 
    the foil side of the board as shown in figure 4. The wire may be 
    conveniently routed between the circuit board and the chassis.

15. Install insulating tape below the area of the modification to ensure 
    that no components short out against the case.

16. This completes the modification procedure. 

The TS-430S will now select either AM Wide or Narrow. 
Before reassembly, go back through the procedure and check your work, 
to ensure no errors have been made


NOTE: This is an optional change and may not be performed in warranty.