Labels:book | bulletin board | dialog box | monitor | reckoner | sky | window OCR: KENWOOD SB-975 SERVICE BULLETIN AMATEUR RADIO SUBJECT DATE SM-230 RTTY CROSS PATTERN ATTENUATION 08/ /08/90 Some users the SM-230 have reported that the MARK and SPACE gain adjus tments not sufficiently reduce the signals to display them on the CRT The foll modificat on will correct this condit on REOUTRED PARTS 680 OHM 1/8W RESISTOR RD14CB2B681J QTY Disconnect the power cord and control cables. Remove the top cover screws) Locate the Hori zontal unit This board is vertically mounted uo the right side of the SM-230 Locate resistors R318 and R322 on the Horizontal unit. Replace R318 and R322 with 680 ohm Assemble the SM-230 Adiust the MARK and SPACE gain adjustments as necessary to obtain the correct cross pattern MARK SPACE GAIN GAIN R318 R322 MARK SPAC POS P05 Time required to perform thi ...
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