Compact 31.0 KB PDF for the 2SK662, a JIS-registered N-channel field-effect transistor number, most likely the manufacturer datasheet despite its schematic label. The file name gives nothing beyond the part number, so the exact maker and revision are unknown. Such a sheet lists package type, pin assignment and limit values, letting a technician confirm orientation on the board, test the device out of circuit and choose an equivalent replacement. Any standard PDF viewer will display it.
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.