Part 2SC3070 is the subject of this 91.1 KB PDF, listed among schematics. No manufacturer, package or gain grade appears in the name. Following JIS numbering, 2SC means an NPN bipolar transistor aimed at high-frequency work. Technicians use such sheets to identify leads before soldering, to check that a replacement meets the voltage and current limits, and to compare gain bins. Opening it needs only a PDF viewer. Always match the printed marking on the original component first.
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.