An 88.9 KB PDF for the 2SD1247, indexed as a schematic although the name identifies a single semiconductor. Following JIS conventions, the 2SD prefix stands for an NPN bipolar transistor for low-frequency applications. The document should list maximum ratings, electrical characteristics at stated test conditions and package information. Before replacing the part, compare the pinout drawing with the footprint on the board, and when using an equivalent, check that gain, voltage and current figures are adequate for the circuit.
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.