Datasheet PDF of 107 KB for the 2SJ381, indexed as a schematic. The prefix 2SJ comes from the Japanese JIS discrete semiconductor scheme and denotes a P-channel FET. Only the part number is given, with no maker or package. Open it in a standard PDF viewer to review absolute maximum ratings, electrical characteristics and outline dimensions. Use those values when diagnosing a failed switch stage or selecting a substitute, and confirm the pin order on the PCB matches the document.
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.