Part number 2SK2199 names this 104 KB PDF, which is grouped under schematics but is most likely a datasheet for an N-channel field-effect transistor. The 2SK prefix comes from the Japanese JIS/EIAJ standard; the name gives no maker, package or ratings. The document should let you identify terminals and maximum voltage and current, and compare on-resistance and gate threshold when replacing the part. Check the actual component marking against the sheet before fitting a substitute.
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.