PDF reference of 43.6 KB covering the 2SA1258. No device, board or revision is mentioned, only the component code, whose 2SA prefix denotes a PNP transistor in the Japanese JIS standard; the file is therefore likely a datasheet despite its schematic label. Look for pin assignment, case type, maximum collector voltage, current and power figures. Use it to verify a part pulled from a board, to avoid reversed installation, and to compare specifications with any substitute before soldering it into place.
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.