Datasheet-type PDF for the 2SA1357, sized at 177 KB and catalogued as a schematic. The file name gives only the part number. By JIS convention the 2SA prefix designates a PNP transistor for high-frequency service. Technicians refer to such a document to look up base, collector and emitter positions, maximum ratings, hFE classification and package type when testing or replacing the part. Verify the body marking, which typically appears as A1357, against the component on the board first.
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.