To fix any unwanted streaks or Lines in a Scan, Copy, or Fax, follow the steps below:
1.Place the marked document next to the ADF scanner glass strip to help identify where the marks are coming from.
2. Spray a clean, lint-free cloth with Glass Cleaner (Do NOT spray directly on scanner strip or glass) and lightly wipe away any debris or marks from scanner strip.
3. Also wipe the plastic ADF strip on the underside of the upper lid.
4. Make sure to wipe both strips with a dry, lint-free cloth to remove the glass cleaner. Be sure not to be using paper wipes so you can avoid any paper residue.
5. Now apply steps 2-4 to the glass bed/underside of upper lid. When done - try to test it out.
Please see this video for a more detailed set of instructions.