The 2SC3671 transistor is documented in this 178 KB PDF, which the catalogue lists as a schematic. Per the Japanese JIS scheme, the 2SC prefix identifies an NPN bipolar part, and the name gives no variant, revision or manufacturer. Expect specification tables, characteristic graphs and mechanical outline. Use it to locate base, collector and emitter on the package, compare measured behaviour with expected values and evaluate alternative parts before soldering a replacement into the board.
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.