Component sheet for the 2SJ307, delivered as a 115 KB PDF and indexed under schematics. Only the part number is given in the name. In the JIS scheme, 2SJ indicates a P-channel field-effect transistor, so the file should list pinout, absolute maximum ratings and electrical characteristics. Technicians use such data to verify a failed part, test it with a meter in diode mode and source an equivalent. Confirm the package marking first, because similar codes can belong to different devices.
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.