The 2SA1420 is the subject of this 91.5 KB PDF, which sits in the schematic section but by its naming is a part-level datasheet. Within the Japanese JIS designation system the 2SA series is reserved for high-frequency PNP transistors. The name offers no revision or vendor detail. Open it in an ordinary PDF viewer to read the lead configuration, outline drawing and electrical characteristics, and always check the pin order against the board before installing a replacement from a different supplier.
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.