Reference PDF for the 2SC4602, around 119 KB, placed in the schematic category. Nothing in the name refers to a device or board, so treat it as a component datasheet for this JIS-numbered NPN high-frequency transistor. Expected data includes pinout, maximum voltage, current and dissipation, electrical parameters and package drawings. Before replacing or testing the part, verify its marking and package style against the sheet, since similar-looking parts may have different pin orders.
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.