PDF datasheet covering the 2SA1020, about 211 KB, listed in the schematic part of the index. JIS numbering assigns the 2SA prefix to PNP bipolar transistors. The name offers nothing beyond the part number, so details such as package and gain grades must be read inside. When replacing a failed transistor, use this sheet to verify emitter, collector and base positions, compare ratings with alternatives, and ensure the new part fits the existing footprint on the PCB.
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.