A 137 KB PDF on the 2SA1225, named only with the part number; despite the schematic category it is most likely the manufacturer datasheet. JIS designations starting with 2SA refer to PNP bipolar transistors. The document is useful for checking maximum ratings, gain ranks, switching or frequency data and the mechanical outline. Compare the printed code on the board component, often shortened to A1225, and confirm the base, collector and emitter layout before installing a replacement or cross-reference part.
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.