The 2SC3116 NPN transistor is described in this 47.6 KB PDF, placed in the schematic category. The 2SC prefix comes from the Japanese JIS part-numbering system, and the component is commonly marked C3116. Beyond the part number the name says nothing about package or grade. Technicians use such a sheet to locate collector, base and emitter, verify maximum ratings for the circuit, and choose a cross-reference replacement. Compare the marking on the actual part with 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.