Catalogued as a schematic, the 400 KB PDF is named only for the 2SK2835 part number. In the JIS scheme the 2SK prefix denotes an N-channel field-effect transistor, which points to a datasheet covering ratings, curves and mechanical outline. Technicians use it to verify pinout, interpret meter readings on a suspected failed MOSFET, and match parameters when choosing an equivalent. Confirm the marking and package on the actual board part, since similar numbers can describe quite different devices.
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.