This 104 KB PDF covers the 2SC5256FT. The FT suffix seems to denote a specific package version of the 2SC5256 NPN transistor, and a separate file for the base number exists, so compare the outline drawings. Filed as a schematic, it is most likely a datasheet without any device circuit. Check the tiny SMD marking, pin order and footprint against the document. Confirm voltage, current and frequency limits before substituting a part on 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.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.
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