PDF component sheet, 184 KB, for the 2SA1620 transistor, filed as a schematic. Japanese JIS designations beginning with 2SA indicate a PNP bipolar device intended for high-frequency circuits. Nothing else, such as manufacturer or package, is stated in the file name. Typical bench use is checking the pinout before desoldering, reading out the breakdown voltages and power dissipation, and confirming that a proposed substitute shares the same package and lead order so it drops straight into the footprint.
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.