Short 125 KB PDF on the 2SC5086FT, the FT-suffixed variant of the 2SC5086 NPN transistor; the name does not say what the suffix means, though such suffixes usually mark a package or variant. It is filed as a schematic but most likely holds a datasheet. Use it to check the outline, pin assignment and ratings for this specific version. Because suffixed parts can come in a different case from the base number, verify the footprint and marking on the PCB before ordering or fitting a 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.