Reference PDF for the 2SA1954, 261 KB, filed as a schematic yet in all likelihood the component datasheet. Japanese JIS numbering marks 2SA parts as PNP bipolar transistors. Before swapping this device, a technician can use the sheet to verify pin order, compare breakdown voltages and current limits, and read any hFE grade letters stamped on the case. The name offers no other information such as producer or edition, so match the package and marking 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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)