A small 31.5 KB PDF identified only by the part number 2SK374. Under JIS numbering the 2SK series covers N-channel FETs, so the content is almost certainly a short datasheet even though the index lists it as a schematic. Expect pin assignment, absolute maximum ratings and typical characteristics. Use it to check gate, drain and source identification before in-circuit testing with a meter, and compare the case marking with the sheet before ordering a replacement or cross-reference.
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.