The 2SJ584LS is documented in this 42.9 KB PDF, placed in the schematic category but named as a single-part datasheet. Per the Japanese JIS scheme, 2SJ identifies a P-channel field-effect transistor; the LS suffix denotes a variant the name leaves undefined. Open it in any PDF reader to check pinout, absolute maximum ratings and package dimensions before replacing a failed switch. Match the complete part code and footprint on the PCB, since no maker is named.
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.