Nothing beyond the code 2SJ272 is given in the name of this 92.3 KB PDF. Japanese JIS numbering assigns the 2SJ prefix to P-channel field-effect transistors, so the document is likely the datasheet for that part, even though it sits in the schematic category. Technicians check such sheets for voltage and current ratings, switching characteristics and the outline drawing when identifying a failed device. Any PDF viewer opens it. Always compare the body marking and pin arrangement before fitting a replacement or equivalent.
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.