A 133 KB PDF named 2SC5111FT, grouped with schematics but evidently a datasheet for a transistor variant of the 2SC5111. The 2SC prefix in JIS numbering marks an NPN bipolar device, and the FT suffix denotes a version of that base part, so the package or ratings may differ from the plain 2SC5111; read the sheet rather than assume they are interchangeable. Use it to confirm lead order and package outline, and match voltage, current and dissipation figures before soldering in any substitute.
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.