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                             K E N W O O D
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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 # 970
MODEL: SM-230
SUBJECT: BANDSCOPE ATTENUATION

When the SM-230 is used as a bandscope, the attenuator circuit is bypassed. 
Sometimes it is necessary to use the attenuator during strong signal 
reception or high noise conditions. The following modification will allow 
the attenuator circuit to function in the bandscope mode.

REQUIRED PARTS:

W05-0309-00	ATT SUB-UNIT

1. Disconnect the power cord and patch cords.

2. Remove the top cover (6 screws).

3. Remove the Horizontal unit's mounting screw and secure the ATT sub-unit 
   with the supplied 2.6mm screw and washer.

4. Remove connector P12 from the Horizontal unit and insert it into jack 
   P1 on the ATT sub-unit.

5. Insert connector JA from the ATT sub-unit into jack P12 on the 
   Horizontal unit.

6. Insert the two wire plug, supplied in the kit, into jack P2 on the 
   ATT sub-unit.

7. Solder the exposed ends of the red and the brown wires to the Panel 
   unit as shown in figure 2.

8. Solder the two jumper wires (they look like resistors) as shown in 
   figure 2.


This modification may be covered under warranty.
Time required to perform the modification is 0.5 hrs. or less.