PDF covering the 3SK189, about 178 KB in size and listed in the schematic category, though the name points to a single component datasheet. The 3SK prefix belongs to the Japanese JIS registration for four-terminal FETs, typically dual-gate MOSFETs serving RF amplifiers and mixers. The larger file size suggests several pages of curves and package outlines. Use it to check pinout and ratings during tuner or front-end repair, and confirm the device marking on the PCB before treating it as the correct reference.
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.