PDF for the 2SA1310, 41.2 KB, carrying an E suffix in the name whose meaning is not stated and may simply mark a document edition. The 2SA prefix follows JIS numbering for PNP bipolar transistors, and though filed as a schematic the file is likely the part datasheet. It is handy for checking lead order, package outline and absolute maximum ratings before replacing a failed device or choosing an equivalent. Confirm the exact marking on the original component first.
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.