Transistor datasheet for the 2SA2070 in PDF format, roughly 189 KB. The 2SA prefix places it in the JIS category of PNP transistors for high-frequency use. Contents usually include the pinout, package outline, absolute maximum ratings, electrical characteristics and typical performance curves. This is useful for identifying terminals on the PCB, interpreting diode-mode readings across the junctions, and comparing ratings when a direct replacement is unavailable. Confirm the package and marking code on the board match the document.
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.