File 2SC2377_E is a 62 KB PDF linked to the 2SC2377 NPN transistor. The 2SC prefix comes from the Japanese JIS scheme, and the meaning of the _E suffix is not stated in the name. The index lists it as a schematic, though it is most likely a datasheet. Open it in any PDF viewer to check pinout, maximum ratings and gain figures before replacing a failed device or approving a cross-referenced equivalent from another manufacturer.
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)