A small 28.7 KB PDF identified only by the code 2SC5680, a number of the Japanese 2SC family of NPN bipolar transistors. Although catalogued as a schematic, its content is almost certainly a short part datasheet. Nothing beyond the part number appears in the name. Use it to read the collector-emitter voltage, collector current, hFE range and lead arrangement when testing or replacing the device, and check the body marking against the sheet, as surface-mount versions usually carry an abbreviated code.
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.