PDF reference, 104 KB, for the 2SC5258, categorized in the index as a schematic. The JIS-style 2SC prefix denotes an NPN bipolar transistor, while the name says nothing about package or ratings, so those must be read inside the document. Typical bench use is checking pinout before desoldering, testing junctions with a multimeter and comparing specifications of possible replacements. Confirm the marking printed on the original component matches this number before relying on the data.
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.