The 2SC5488 is covered by this 34.5 KB PDF, indexed as a schematic. Since 2SC numbers designate NPN bipolar transistors in the Japanese JIS system, the file is likely a datasheet rather than a full circuit diagram. Look in it for maximum ratings, electrical characteristics, package dimensions and pin assignment. Before replacing a suspect part, confirm the code printed on the component, check the pin order for that particular package, and make sure any equivalent meets or exceeds the original ratings.
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.