Short 20.8 KB PDF for the 2SC5274, written in lowercase in the name. Parts beginning with 2SC are NPN bipolar transistors under Japanese JIS numbering, so this is most likely a brief datasheet despite the schematic label. It should give the pinout and key ratings. Use it to identify collector, base and emitter for testing and to compare limits when sourcing a replacement. Given the small size, check another source if detailed curves are needed.
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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)