Listed as a schematic, this 422 KB PDF carries the part number 2SK2232 and is most likely the datasheet for that N-channel FET. The 2SK prefix comes from the Japanese JIS/EIAJ system for field-effect transistors. No brand, package or ratings appear in the name. Use it to confirm terminal layout and maximum voltage and current, and to compare on-resistance and thermal limits when replacing a failed transistor. Measure the suspect part out of circuit before condemning 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.