HP Deskjet 6943 Printer - Manual (Page 113)

4. Gently place the printer on top of the paper tray.
Load the 250-Sheet Plain Paper Tray Accessory
Follow these instructions to load the 250-Sheet Plain Paper Tray Accessory.
Two parts
The 250-Sheet Plain Paper Tray Accessory has two parts.
1 Base
2 Lower tray
The lower tray has three size adjusters.
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.
User's guide 111