Datasheet PDF of 172 KB carrying the part number 2SC5358, listed under schematics in the index. The 2SC prefix is assigned under the Japanese JIS standard to NPN transistors intended for high-frequency service, so no board or device is described here. Technicians refer to the ratings, gain classes and pin diagram to test the transistor or find an equivalent. Any PDF viewer opens it. Before trusting the data, make sure the marking and package on the component you removed actually correspond to this number.
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.