Reference sheet for the 2SD2116 NPN transistor, supplied as a 74 KB PDF. Its name follows the Japanese JIS 2SD convention and carries nothing beyond the part number. A repair technician would open it to look up collector-emitter breakdown, current and power limits, gain categories and the physical outline. That information helps identify the part on a board, test it correctly and choose a replacement. Compare the gain letter or marking code on the original component before substituting.
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.