Positivo board schematic coded POS-MIG31AG, with a Nottec tag in the name, supplied as an 895 KB PDF. Nottec appears to be the related product line, but the file gives no revision, so compare the code on the PCB and the title block before relying on it. Positivo is a Brazilian brand whose machines use boards from external manufacturers. Use the drawings to follow power rails and signals, check component values, locate test points and isolate a shorted part. Any common PDF viewer will open 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 @abgm_manutencao_esquemas. 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.