Covering the 2SK3495, this 28.0 KB PDF carries the schematic tag yet is named after one JIS part, pointing to a brief datasheet. Under Japanese numbering, 2SK is used for N-channel field-effect transistors. Open it in a standard PDF reader to check the pin diagram and absolute maximum ratings before replacement. A small file usually means condensed data, so compare package type with the board footprint, read the component marking closely, and select a substitute only with equal or higher ratings.
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.