Filed under schematics, this 115 KB PDF is named only with the part number 2SA1319, which follows the Japanese JIS scheme where the 2SA prefix marks a PNP bipolar transistor. It is most likely a component datasheet rather than a board drawing. Technicians consult such a sheet for pinout, package outline, voltage and current limits and gain figures when they find this transistor on a board. Confirm the marking on the part, which is often abbreviated to A1319, before ordering a replacement.
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.