HP Officejet J4680 - Manual (Page 121)

If you have lines or dust appearing on scanned documents or faxes, clean the mylar
strip in the ADF.
To clean the rollers or separator pad
1. Remove all originals from the document feeder tray.
2. Lift the automatic document feeder cover (1).
This provides easy access to the rollers (2) and separator pad (3), as shown below.
1 Automatic document feeder cover
2 Rollers
3 Separator pad
3. Lightly dampen a clean lint-free cloth with distilled water, then squeeze any excess
liquid from the cloth.
4. Use the damp cloth to wipe any residue off the rollers or separator pad.
NOTE: If the residue does not come off using distilled water, try using
isopropyl (rubbing) alcohol.
5. Close the cover of the automatic document feeder.
Clean the device 117