PDF of 46.0 KB documenting the 2SB1409, a Japanese-registered transistor number; the name carries no further detail such as manufacturer or version. The 2SB prefix stands for a PNP low-frequency bipolar transistor under JIS rules. Although filed among schematics, it serves as a component datasheet: look up the lead arrangement, package, breakdown voltages and current capability here before replacing a failed device. Check the part marking on the board first so that the right sheet is used.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @cyberlanelectonik. Enginerys does not host this file.
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