Reference sheet in PDF form, 29.3 KB, for the part numbered 2SC5689. Although listed as a schematic, a name made of only a JIS transistor code points to a manufacturer datasheet. The 2SC prefix identifies an NPN bipolar transistor. No package, revision or maker appears in the name. A repair technician would open it in a PDF viewer to read collector-emitter voltage, current rating, gain and pin assignment before choosing an equivalent. Check that the device on the PCB really carries this number, as SMD codes are often abbreviated.
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.