PDF reference for the 2SK2339 transistor, 35.9 KB, catalogued under the schematic type. Under JIS rules the 2SK prefix marks N-channel FETs, so the content should be a datasheet rather than a board diagram. A technician checks such pages for drain-source breakdown voltage, RDS(on), power dissipation and the pin layout of the package before swapping a suspect device. The file name gives only the part number; confirm suffix letters and case style on the actual component to avoid an unsuitable 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.