The 2SK1489 named here is a discrete transistor code: under JIS numbering, 2SK denotes an N-channel field-effect transistor. Although catalogued as a schematic, this 386 KB PDF should be read as the datasheet for that single component, not a circuit of a device. It is useful for confirming pin order, breakdown voltage, drain current limits and thermal data during diagnosis of a shorted or open MOSFET. Verify that the printed marking on the board part reads the same before relying on the figures inside.
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.