PDF of 64.4 KB for the 2SA1757, indexed as a schematic but bearing a JIS PNP bipolar transistor number, so it is a part datasheet. The extra 1-2 token in the name is not explained; it may denote a page range or document edition, but that cannot be confirmed. Expect ratings, characteristics and the package drawing. Check the marking and pin order against the component on your board before relying on it for a substitution or a junction test.
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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)