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World of Ham Radio 1997
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WOHR97_AmSoft_(1997-02-01).iso
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asb0975.txt
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1997-02-01
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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 <<<
==============================================================================
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 # 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