HP LaserJet Pro 400 color Printer M451 series - Manual (Page 77)

Load paper trays
Load Tray 1
1. Open Tray 1.
2. Pull out the extension tray.
3. If you are loading long sheets of paper, flip
out the extension.
4. Extend the paper guides fully (callout 1) and
then load the paper stack into Tray 1 (callout
2). Adjust the paper guides to the size of the
paper.
NOTE: Place the paper into Tray 1 with the
side to be printed on face-up and the top
toward the product.
ENWW Load paper trays 59