PDF of 105 KB for the 2SA1606, indexed among schematics yet covering a single semiconductor. In the Japanese JIS scheme, the 2SA prefix identifies a PNP transistor intended for high-frequency applications. No maker, package or revision appears in the name. Technicians open sheets like this to match pin order with the board footprint, read collector voltage and current limits, and check that a cross-referenced substitute offers comparable gain and frequency characteristics.
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.