Code 50MT060ULS is the only information in the name of this 224 KB PDF, filed as a schematic, with no brand, model or board specified. It appears to be a semiconductor module part number, related to the 50MT060WH file, and the larger size suggests a detailed datasheet with curves and outline drawings. Technicians consult it for terminal pinout, internal topology and electrical limits during repair. Compare the printed code on the module with the document heading before you order a replacement.
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.