Transistor datasheet in PDF for the 2SC4247, 302 KB, indexed with schematics rather than board diagrams. Only the part number is provided in the name. The 2SC prefix under JIS numbering identifies an NPN transistor of the high-frequency type. Typical uses include checking terminal layout, absolute maximum ratings and gain classes, and choosing an equivalent when stock is unavailable. Before replacing a device, measure it in diode mode, confirm the C4247 marking and compare the package to the drawing here.
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.