Schematic for the Quanta RD1 board at revision 1A, labelled in the name as the FJ series, in a 1.00 MB PDF. The name does not say which brand the FJ series belongs to, so match the RD1 project code printed on the motherboard instead. The (4) suffix marks this as one of several identical copies. A repair technician uses the drawing to follow power rails from the charger circuit onward, find test points and confirm component values while diagnosing no-power or short faults. It opens in any standard PDF viewer with searchable pages.
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.