HP Deskjet 6988dt Printer - Manual (Page 163)

1 Paper-width guide
2 Paper-width fence
3 Paper-length guide
Note When changing the paper size in the paper tray, you must set all three
paper guides.
Set the paper size
When changing the paper size in the paper tray, all three paper guides must be set to
the correct setting.
Follow these steps to set the paper size:
1.
Remove the lower tray from the base.
2. Slide the paper-width guide until the arrow is even with the correct setting.
1 Align the arrows
User's guide 161