A 91.7 KB PDF for the 2SA1831, placed in the schematic section of the catalogue. According to Japanese JIS numbering, 2SA designates a PNP bipolar transistor. The name carries only the part number, so package, manufacturer and revision are to be found inside. Typical use in repair is confirming pin order and ratings before replacing a shorted or open transistor, and picking a cross-reference part whose voltage, current and gain are at least equal to the original.
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.