A 139 KB PDF for the 2SK2623, which JIS numbering identifies as an N-channel FET. Although indexed as a schematic, it is effectively a component datasheet with limits, electrical parameters and package details. Technicians use it to find the pinout before measuring, to check whether a part has failed short and to select an equivalent with suitable voltage, current and on-resistance. Check that the marking on the device reads 2SK2623 exactly, since nearby numbers differ.
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.