The 2SA1438 transistor is described in this 133 KB PDF, which the index files under schematics. JIS designation assigns 2SA to PNP transistors intended mainly for high-frequency work. Such a sheet typically provides the package drawing, pin order, electrical limits and transition frequency. Repair use includes confirming the device from its body marking, checking junctions out of circuit, and finding an equivalent with comparable speed and ratings. Match the package footprint on the PCB before soldering in any alternative.
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.