A 58.1 KB PDF for the 2SA1552, catalogued as a schematic though the name indicates a single transistor. Per JIS nomenclature, 2SA identifies PNP bipolar transistors for high-frequency use. The document should give pinout, breakdown voltage, collector current, dissipation and gain classes. Repair technicians use it to understand what readings to expect in diode mode and to select a part that matches or exceeds the original ratings. Check the package drawing against the board, as pin order varies between outline types.
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.