Filed under schematics, the 146 KB PDF is named 2SC2883, a Japanese JIS designation for an NPN bipolar transistor. It is probably the manufacturer datasheet; the name mentions no maker, package or revision. For repair purposes the useful content is the pinout, collector-emitter and collector-base voltage limits, current rating, dissipation and hFE grouping. Compare these numbers against any candidate equivalent, and confirm that the footprint and lead order on the board match before soldering in a replacement part.
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.