Listed as a schematic, this 246 KB PDF carries the name 2SJ201, a JIS part number for a P-channel FET, so it is best treated as a component datasheet. The larger size suggests extra graphs or package drawings beyond a basic rating table. Such parts often appear in complementary pairs in amplifier output stages, and the sheet helps confirm limits, pinout and any matched partner listed by the maker. The name does not state the manufacturer, so check the original device marking before choosing a substitute.
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.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.