Named only 2SC4365, this 148 KB PDF is filed with schematics but should contain the manufacturer datasheet for that transistor. JIS numbering assigns the 2SC prefix to NPN bipolar transistors. The name does not state a maker, package or revision. A technician consults it for pinout, breakdown voltage, collector current, power dissipation and characteristic curves before fitting a replacement in a power or amplifier stage. Compare the case style and marking of the failed part with the drawing to avoid fitting the wrong device.
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.