PDF for the 2SK2504 with an added _1-5 suffix in the name, 135 KB in size; the suffix meaning is not stated and may indicate a page range or alternate edition. Under JIS convention 2SK denotes an N-channel FET. A separate copy without the suffix exists at almost the same size, so compare both if details differ. Use the sheet to confirm pinout and maximum ratings before testing or replacing the transistor, and check the component marking matches the number.
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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)