Short 26.8 KB PDF for the 2SC4633LS, catalogued as a schematic but apparently a transistor datasheet. The 2SC prefix denotes an NPN bipolar device under JIS numbering. The LS suffix most likely marks a package or lead variant of the 2SC4633, though the name does not explain it. Compare it with the plain 2SC4633 sheet to see what differs. Before substituting, make sure the footprint, lead form and pin order match the part removed from the board.
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)