Listed as a schematic, this 31.1 KB PDF is named for the 2SJ594, a format typical of an individual component datasheet. In the Japanese JIS system, 2SJ designates a P-channel FET. The pages should provide pin assignment, voltage and current ratings, switching characteristics and package dimensions, useful for in-circuit testing and for selecting a compatible substitute. Nothing beyond the part number is stated, so compare the physical marking and footprint on the board 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.