PDF document of 212 KB for the 2SC3620, filed under schematics but in practice a component datasheet for a discrete transistor. Under the Japanese JIS naming system the 2SC prefix marks an NPN bipolar transistor intended mainly for high-frequency use. A technician opens it in any PDF reader to check the pinout, package outline, maximum voltage and current ratings and gain figures before replacing a failed part. Confirm the marking on the original part before choosing a substitute from these figures.
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.