A 58.9 KB PDF for the 2SA1964, with a 1-2 tag in the name whose meaning is not stated; it may indicate pages or an edition. Another 2SA1964 file sits in the index, so compare both if details differ. Under JIS rules 2SA designates a PNP bipolar transistor, and despite the schematic label this is probably a datasheet. It supports checking pin order, package outline and maximum ratings before fitting a replacement or picking a cross-reference part.
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)