PDF reference of 42.4 KB for the 2SJ578 part, listed in the schematic section. Japanese JIS coding gives the 2SJ prefix to P-channel field-effect transistors, so the content most likely covers ratings, characteristic curves and mechanical dimensions. During repair it serves to identify pins, confirm voltage and current limits and evaluate an equivalent part. The file name names no maker or package, so check the printed marking on the installed component to be sure this document applies.
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.