User Guide for HP J5730 / J5740 / J5750 / J5780 / J5785 / J5788
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To restore the factory defaults 1...Press 6, then press 4...The factory default settings are restored......
Restoring the factory defaults will not affect any changes you made to scan settings and the language and country/region settings...Personal settings and lists, for example fax header, fax number, junk fax list, and speed dial list, that you have saved will not be deleted when restoring the factory defaults......