A 32.3 KB PDF for the 2SJ591LS, filed under schematics but named like a transistor datasheet. The 2SJ prefix follows Japanese JIS coding for P-channel field-effect transistors, and the LS suffix most likely indicates a specific package or variant, which the name does not explain. Check pinout, ratings and outline inside before substituting a part. Because suffixes can change the package, confirm that the marking and footprint on the board match this exact variant.
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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The standard format for schematics, block diagrams, power-sequence charts and service manuals.