The 2SA1564 is covered by this 90.3 KB PDF, which is labelled as a schematic but named after a discrete component. Under JIS part coding, 2SA designates a PNP bipolar transistor meant for high-frequency circuits. Expect absolute maximum ratings, hFE ranking, transition frequency and package dimensions. Technicians use the sheet to identify pins for in-circuit testing and to pick a compatible replacement. Make sure the substitute meets the voltage and current ratings and fits the same footprint with identical pin order.
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.