Brief 68.6 KB PDF bearing the number 2SC4681, placed under schematics. The 2SC prefix is JIS shorthand for an NPN bipolar transistor, so treat the file as the part datasheet. The name reveals no maker or package. Use it to confirm pin assignments and limits before testing with a meter in diode mode or substituting another device, and confirm that the marking on the component in front of you corresponds to this number before trusting the data.
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)