PDF reference of about 107 KB for the 2SJ285, filed in the schematic category. The name gives nothing beyond the component type. The 2SJ prefix in the JIS system indicates a P-channel FET, so expect a datasheet with ratings tables, characteristic curves and an outline drawing. Technicians use it to find gate, drain and source, judge failure from meter readings and compare alternatives. Confirm that the marking on the actual part matches before trusting these specifications.
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.