A 94.1 KB PDF labelled 2SC4272, sitting in the schematic category but carrying only a part number, so it is probably the datasheet for that transistor. JIS designations starting with 2SC belong to NPN bipolar transistors, usually printed as C4272 on the case. Consult the package drawing to confirm base, collector and emitter positions, then compare breakdown voltage, collector current, dissipation and gain against the circuit before fitting any substitute after a failure.
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.