PDF reference for the 2SJ338, 113 KB, filed under the schematic category. No board number, brand or revision is present in the name. The 2SJ prefix of the JIS standard marks a P-channel FET, so the document should describe electrical characteristics and the physical package of the device. Typical bench use is checking which leg is gate, drain and source, testing for leakage or short, and comparing specifications when looking for a substitute with a compatible footprint and voltage rating.
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.