Positivo motherboard schematic labelled POS-MI945AA, with the codes 7267 and v42 and a 170s tag, in a 961 KB PDF. The MI945 designation suggests an Intel 945 chipset board, but only the name is the reference, so compare it with the markings on the PCB and the sheet title block. Positivo is a Brazilian brand using boards from outside ODMs. The schematic is used for tracing rails, checking component values, following signals and locating shorts. Any standard PDF viewer opens 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.