At 330 KB, this PDF named 2SJ168 is the largest in its series and likely a fuller datasheet for that JIS-numbered P-channel field-effect transistor, possibly with extensive graphs. Though filed as a schematic, use it for pinout, absolute maximum ratings and switching or transfer characteristics during fault finding or substitution. Open it in any PDF reader. The file name names neither the manufacturer nor the package, so compare the original component marking and case before relying on it.
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.