Indexed as a schematic, this 27.0 KB PDF names the 2SB633P, a PNP transistor under JIS numbering; the P suffix is probably an hFE gain rank, a common convention for these parts, though the file name alone does not confirm it. Content should be a datasheet with pinout, case outline and ratings. Use it to verify orientation and limits, and when replacing, pick a part with matching polarity, adequate voltage and current rating and similar gain, checking the lead order of the substitute before soldering.
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.