Part documentation for the 2SJ337 in a 98.2 KB PDF. The file name names only this semiconductor, nothing about a device. The JIS designation 2SJ refers to P-channel field-effect transistors, so the PDF is presumably a datasheet rather than a full circuit diagram. Repair work uses it to look up maximum ratings, on-resistance and pin layout. Before swapping the part, make sure the replacement has the same package and polarity and at least equal voltage and current capability.
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.