The 2SC2230 is the subject of this 202 KB PDF, indexed among schematics yet named only by a transistor part number. In JIS numbering, 2SC identifies an NPN bipolar device, so the content is probably a manufacturer datasheet with pinout, package drawing and electrical tables. It helps when checking a transistor in-circuit, measuring diode junctions with a meter, or confirming that a substitute meets voltage, current and dissipation limits. Match the printed marking and package style before ordering a replacement.
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.