A compact 19.1 KB PDF for the 2SA1580, small enough that it is probably a one- or two-page summary sheet. No other details are present in the name. Per JIS nomenclature, a 2SA number belongs to a PNP high-frequency bipolar transistor. Expect key ratings, a short characteristics table and the package outline. It serves for quick pinout confirmation and for checking that a proposed replacement can handle the circuit voltage and current. Compare the original device marking with the sheet before relying on it.
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.