PDF of 42.8 KB for part 2SJ585LS, listed under schematics. JIS semiconductor coding assigns 2SJ to P-channel FETs, so this is most probably a datasheet with ratings, curves and mechanical outline. The LS suffix designates a particular version not explained by the name. A technician would use it to identify gate, drain and source, check voltage and current limits, and assess a substitute. Verify that the full marking, including suffix, matches the component before relying on the data.
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.