A 158 KB PDF giving the reference for the 2SA1381, catalogued as a schematic though the name denotes a single semiconductor. Under Japanese JIS numbering, a 2SA code marks a high-frequency PNP transistor. The name states nothing about the manufacturer or grade. During repair, such a sheet is used to confirm pinout and outline, check voltage and dissipation limits against the circuit, and select a suitable equivalent once the pin order has been checked on the board.
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.