The 2SC3502 NPN transistor is the subject of this 157 KB PDF, which the index files under schematics. JIS designation rules reserve 2SC for NPN bipolar transistors in the high-frequency class. The file is useful for locating base, collector and emitter on the package, reviewing voltage, current and dissipation limits and comparing gain bins when sourcing a replacement. Nothing more is indicated by the name. Verify that case style and marking on the actual board match the drawing, since pin order differs between packages.
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.