Datasheet PDF, 90.4 KB, for the 2SA1702, named only by part number and filed under schematics. Japanese JIS designations beginning with 2SA identify PNP bipolar transistors, so the file most likely contains limits, electrical characteristics and a package drawing rather than any circuit for a specific device. Repair technicians use such sheets to read pinout, run a diode-mode junction check with the right polarity expectations, and verify that a candidate replacement meets the voltage, current and dissipation requirements of the stage.
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.