An 88.5 KB PDF on the 2SK1738 transistor. In the JIS system, 2SK designates an N-channel FET, so this file is most likely the datasheet rather than a circuit schematic. Nothing beyond the part number is stated in the name. The sheet should cover limits, characteristics and pin assignment. Use it during repair to identify terminals, assess whether the device has failed and find a substitute with adequate voltage and current ratings. Compare the package on the board with the outline shown before replacing.
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.