A 44 KB PDF for the 2SB1473, with the _E suffix probably indicating an English version, catalogued as a schematic but by its name a component datasheet. Within the JIS scheme, 2SB denotes a PNP low-frequency transistor, often found in power switching, audio and regulator sections. The compact sheet should cover ratings, characteristics and dimensions. Use it to verify the pinout and limits before replacing a failed part and to confirm a candidate substitute matches the original package.
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.