PDF for the 2SA1487, 38.8 KB, carrying an _E suffix that the name does not explain, possibly an edition or language marker. Although indexed as a schematic, it should be a component data sheet; JIS 2SA parts are PNP transistors. Expect absolute maximum ratings, characteristics and a package drawing. It helps a technician verify pin order, check whether a replacement meets the circuit requirements and confirm identification of a part from its marking. Opens in any PDF viewer.
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.