Technical PDF for the 2SJ313, 238 KB in size. The file name identifies only this component, with no device or revision details. Following JIS conventions, 2SJ marks a P-channel FET, so the document is likely a manufacturer datasheet with electrical tables and a package diagram. Repairers consult it to locate gate, drain and source, judge whether measured resistances indicate failure, and compare specs for a replacement. Check the part marking on the board before relying on this sheet.
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.