HP Deskjet 6620 Color Inkjet Printer - Manual (Page 141)

5. Tilt the Small Paper Tray forward and open the lower door of the accessory.
1. Tilt the Small Paper Tray
2. Open the lower door
6. Remove any paper that is inside the accessory.
7. Close the accessory, and then secure the back lever to close the accessory.
8. Re-attach the accessory to the printer.
HP Deskjet 6600 series printer User's Guide
141