Lexmark MB2770
Step 1
Open the scanner cover.
Using a damp, soft, lint‑free cloth, wipe the ADF glass pad (A) and ADF glass (B).
Close the scanner cover.
Do vertical streaks appear on scanned documents?
Go to step 2.
The problem is solved.
Step 2
Using a damp, soft, lint‑free cloth, wipe the ADF glass (A) and ADF glass pad (B) in door E.
Contact customer support.