Reference sheet for the 2SA1421, supplied as a 92.5 KB PDF and listed in the schematic category although the name points to a single semiconductor rather than a whole board. In JIS numbering, a 2SA code belongs to a PNP transistor aimed at high-frequency duty. The name gives no maker, so check the logo inside. Use it to verify pin assignment, package dimensions and absolute maximum ratings, and to judge whether an equivalent you have on hand will survive the circuit it goes into.
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.