The 2SK445 part number is all the name provides for this 89.6 KB PDF, filed as a schematic but best treated as a datasheet, as 2SK numbers designate N-channel field-effect transistors per JIS. Expect ratings tables, package outline and performance curves. Technicians refer to it to verify pin layout before replacement, diagnose shorts between terminals, and compare voltage, current and power limits of possible substitutes. Check that the marking and package on the board match the document, then view it in any PDF reader.
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.