HP Officejet J4680 - Manual (Page 122)

To clean the plastic strip inside the automatic document feeder
1. Turn off the device and unplug the power cord.
NOTE: Depending how long the device is unplugged, the date and time might
be erased. You might need to reset the date and time later, when you plug the
power cord back in.
2. Lift the cover of the automatic document feeder until it stops, and then gently pry
the cover to release the catch.
3. Continue lifting the automatic document feeder cover to the vertical position.
Chapter 8
118 Maintain and troubleshoot