The 2SC3916 NPN transistor is the subject of this 30.8 KB PDF. Since the name is only a JIS part number, where 2SC stands for an NPN bipolar device, it is best treated as a component datasheet rather than a board schematic. Typical contents include absolute maximum ratings, electrical characteristics, hFE classes and mechanical dimensions. Technicians consult it to test the part in circuit, confirm orientation when resoldering, and validate substitutes. Check that the package on your board matches the drawing.
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.