For the 2SA1967 transistor, this 90.5 KB PDF most likely provides the manufacturer datasheet despite being filed as a schematic. JIS numbering assigns the 2SA prefix to PNP bipolar parts. Expect pinout diagrams, package dimensions, absolute maximum ratings and characteristic curves, which are the data needed to test a suspect device with a meter or select an equivalent. The file name says nothing about the producer or revision, so confirm the body marking and case style 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.