Always set the paper thickness lever before and after printing onthick paper or envelopes.If you are printing documents with high density graphics orink and the printed pages are smudges, try setting the paperthickness lever to the right position. This unit moves theprint head unit further from the paper. Print quality maydiminish slightly, but the smudges should go away.Setting the Paper Selection LeverSet the paper selection lever to the proper position beforeloading paper. There are two positions according to papertype:ß The back position is for normal plain paper or transparencies.