Small PDF schematic of 267 KB whose name gives only MK6200_B, most likely a model or board code with revision B, but no brand or device type is stated. Before using it, open the document and check its title block to confirm the product and revision match the unit on the bench. A schematic like this lets a technician follow power supply stages, signal paths and component values, measure against expected voltages and identify the reference designators of parts that need replacing during repair.
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 @oficinacomputadores. 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.