The file name gives nothing beyond 2SJ562, a JIS-style designation; the 2SJ prefix denotes a P-channel field-effect transistor. Although filed as a schematic, this 147 KB PDF is in all likelihood the datasheet for that single transistor. Open it in a PDF viewer to read absolute maximum ratings, gate charge, on-resistance and the package drawing, which help when testing a suspect MOSFET with a meter or picking a replacement. Check that the marking and package on your board actually match this part number.
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.