A 333 KB PDF for the 2SK170, filed under schematics though its name is a plain JIS part number, suggesting a datasheet. Under that standard, 2SK denotes an N-channel field-effect transistor. Open it in any PDF viewer to check pin assignment, package outline, ratings and characteristic curves. It is handy when a stage has failed and the transistor must be matched or replaced; check the rank letter printed on the original part, because graded versions differ, and use antistatic handling throughout.
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.