Small PDF document, 28.8 KB, identified only by the part number 2SJ615 and filed as a schematic. Japanese JIS numbering assigns 2SJ to P-channel FETs, so this is most likely a data sheet with ratings, characteristic curves and a package drawing. A technician would consult it to confirm which leg is gate, drain and source and whether a candidate substitute handles the same voltage and current. Verify the part marking against the board, as no manufacturer 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.