The 2SC5684 part number heads this 126 KB PDF, which should be a component datasheet: 2SC is the Japanese JIS code for NPN bipolar transistors. Nothing else is stated in the name. Expect pin diagrams, maximum ratings and characteristic data for use in diagnosis and part substitution. When the original is shorted, use the listed collector-emitter voltage and current values as the minimum for any replacement, and verify the package type matches the footprint.
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)