A 96.0 KB PDF for the 2SC3687 transistor, placed in the schematic category of the index. According to the Japanese JIS system, the 2SC prefix means NPN bipolar. Nothing about variant, revision or maker is stated in the name. The document should list ratings, characteristics and the package drawing, which help confirm base, collector and emitter positions, judge whether the part was overstressed and find a substitute with matching polarity and footprint. Any PDF viewer opens it without special software.
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.