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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 # 975
MODEL: SM-230
SUBJECT: RTTY CROSS PATTERN ATTENUATION

Some users of the SM-230 have reported that the MARK and SPACE gain 
adjustments do not sufficiently reduce the signals to display them on 
the CRT. The following modification will correct this condition.

REQUIRED PARTS:

680 OHM 1/8W RESISTOR		RD14CB2B681J		QTY. 2


1. Disconnect the power cord and control cables.

2. Remove the top cover (6 screws).

3. Locate the Horizontal unit. This board is vertically mounted on the 
   right side of the SM-230

4. Locate resistors R318 and R322 on the Horizontal unit.

5. Replace R318 and R322 with 680 ohm resistors.

6. Assemble the SM-230.

7. Adjust the MARK and SPACE gain adjustments as necessary to obtain the 
   correct cross pattern.

TIME REQUIRED FOR THIS MODIFICATION IS 1 HOUR OR LESS