At just 31.4 KB, the PDF named 2SJ499 is probably a short datasheet or summary sheet, even though it is filed as a schematic. The 2SJ prefix in Japanese JIS numbering denotes a P-channel FET, and the name gives no further device, brand or package information. Use it to check pin assignment and key ratings such as drain-source voltage and continuous current when testing or replacing the transistor. Because a brief sheet may omit detail, confirm the case style and marking on the actual component.
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.