Part-number PDF for the 2SK1471, 92.5 KB in size and labelled as a schematic in the index. Under the JIS system the 2SK prefix designates an N-channel FET, so the document is most plausibly the manufacturer datasheet for that transistor. Use it to read pinout, voltage and current limits, switching data and the package type, which are what matter when diagnosing a blown power stage or choosing a substitute. Open with any PDF reader, and confirm the marking on the part first.
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.