The 2SC3552 transistor is documented in this 121 KB PDF, catalogued under schematics though it is a component datasheet. Japanese JIS naming uses the 2SC prefix for NPN bipolar transistors in the high-frequency group. Use the file to read ratings, characteristic curves and the package pinout, which guide in-circuit testing and safe substitution. Any PDF viewer will open it. Before relying on the pin diagram, compare the body code and package of the fitted part, because one type number can exist in more than one case.
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.