Component document for the 2SJ501 in a 239 KB PDF, labelled in the catalogue as a schematic. The Japanese JIS 2SJ code identifies a P-channel field-effect transistor, making a datasheet the likely content. Characteristic curves, absolute maximum ratings and the outline drawing are what a technician needs to confirm a part is genuine, wire it correctly and find a cross-reference when the original is unavailable. Device, brand and package are not stated in the name, so match the body marking and suffix before use.
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.