A 96.5 KB PDF identified only as 2SK1889 and filed under schematics. Under the JIS scheme the 2SK prefix indicates an N-channel field-effect transistor, so the file most likely holds that device's datasheet. Technicians check such documents for lead layout, voltage and current limits and on-state behaviour before measuring a suspect FET or ordering an equivalent. Nothing else is stated in the name, so confirm that the manufacturer logo and marking on the part match the document.
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.