HP LaserJet 3020 All-in-One Printer - Manual (Page 167)

To remove the media input tray
Note You might need to remove the media input tray to return the device. Use the following
instructions to remove the media input tray without damaging the device.
1. Open the media input tray and remove any media.
2. Slide the media guides inward as far as they will go. Press and hold down the tabs inside
the media input tray, and slide the media input tray out of the device.
ENWW Obtaining hardware service 157