The 2SA1245 is the subject of this 310 KB PDF, catalogued as a schematic although the bare part-number name points to a manufacturer datasheet. In JIS designations the 2SA prefix identifies a PNP bipolar transistor. A technician typically opens a sheet like this in any PDF reader to check the base, collector and emitter pin order, voltage and current limits, and gain figures. Check the full marking on the body, and confirm the package outline matches before soldering in a substitute.
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.