Part documentation for the 2SA1415 transistor, delivered as a 116 KB PDF and indexed as a schematic. JIS part numbers beginning 2SA belong to PNP devices for high-frequency use. Only the part number is given in the name, without vendor or suffix. On the bench this kind of sheet is used to identify pins on an unmarked footprint, check ratings against the voltages measured on the board, and choose an equivalent, keeping in mind that pin order should be verified against the PCB.
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.