HP LaserJet 5100 Printer series - Manual (Page 53)

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Chapter 2: Printing Tasks 45
500-Sheet Tray:
1 Rotate the dial inside the front of the tray to the correct paper size.
2 Load paper with the side-to-be printed facing down, and the top,
short-edge toward the front of the tray.
3 In the printer driver or software application select the size and
location of the rotated paper.
Figure 16 Printing Rotated Paper from the 500-Sheet Tray