P a p e r I n p u t2-4v 4 5 2 0 / 4 5 2 0 m p U s e r ’ s G u i d ePaper input sources are the slots or openings where paperenters the printer. As shown in Figure 2.1, the 4520/4520mpprinters have four paper input sources: three on the front andone on the back.Figure 2.1 Paper input sourcesPaperInputMiddle Paper SourceUpper Paper SourceLower Paper SourceSingle-sheet BypassFeeder (SBF) PaperSourceFront ViewRear ViewWUG-CH02 Page 4 Black,Red,Cyan Sunday, January 22, 1995 7:32 PM