Reference PDF for the 2SA1478 transistor, 155 KB, catalogued in the schematic section. The JIS-style 2SA prefix indicates a PNP bipolar transistor. The name states nothing else, so maker and package must be read from the document itself. Sheets of this kind list absolute maximum ratings, characteristics and package dimensions. During repair they help confirm lead order, select an equivalent with equal or better ratings and avoid fitting a part with a different pinout.
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.