A 187 KB PDF named after the 2SC4408 part number and listed in the schematic category. JIS numbering uses 2SC for NPN bipolar transistors, so treat the file as a datasheet giving pinout, package outline and electrical limits. When a power or switching stage fails, this kind of sheet tells a technician which lead is which and what ratings a substitute must meet. No further details such as brand or version appear in the name; cross-check the component marking on the board first.
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.