A 416 KB PDF covering the 2SK2610, a JIS-designated part whose 2SK prefix identifies an N-channel FET. The index lists it as a schematic, yet the name carries only the part number and nothing about a board or device, so expect a manufacturer datasheet. Its value for repair work lies in the pin assignment, absolute maximum ratings and characteristic curves, which help when testing a suspected shorted MOSFET or picking an equivalent. Compare the body marking and package with the drawing before trusting it.
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.