The 2sa2005 file is a 51.5 KB PDF named for a JIS-designated PNP bipolar transistor, 2SA being the prefix for that device class. It is likely a datasheet rather than a circuit schematic, though filed as the latter, and the name carries no other information. Consult it for pin order, absolute maximum ratings, hFE classification and package outline, and compare the marking on the board's part with the sheet so the correct device is sourced.
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)