Compact 36.9 KB PDF named for the 2SK2375, indexed under schematics but most likely a datasheet for an N-channel field-effect transistor, as indicated by the JIS 2SK prefix. The file name contains no package, maker or revision. It should provide pin assignment and principal ratings, useful when a transistor has failed and a replacement must be matched. Compare the marking on the board part with the number, then check voltage and current limits of any substitute.
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.