The 2SK1724 is the subject of this 91.6 KB PDF. Following Japanese JIS/JEITA conventions, 2SK parts are N-channel FETs, so the document should list absolute maximum ratings, electrical characteristics and an outline drawing. The name provides no manufacturer or revision details. For repair work it helps identify leads while probing, explains expected gate threshold behaviour, and gives the voltage and current figures to match when searching for an available equivalent to replace a damaged unit.
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.