At 41.7 KB, this PDF is labelled with the 2SA1532 part number plus an _E suffix and is indexed as a schematic, though a single-part file like this is normally a datasheet. The JIS prefix 2SA designates a PNP high-frequency transistor. Repair technicians use the data to identify base, collector and emitter, look up breakdown voltages and gain grades, and evaluate substitutes. Any PDF viewer will open it; confirm the device marking and case style on the board correspond to the part described.
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.