Small 39.9 KB PDF for the 2SD2474, carrying an _E suffix whose meaning the name does not state; it may reflect a language or edition marker. A 2SD part under JIS nomenclature is an NPN bipolar transistor for low-frequency applications. The file is categorised as a schematic but should hold datasheet content such as ratings, characteristics and the package outline. Technicians use it to confirm pin order and limits when replacing the device, and should verify the marking on the original part first.
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.