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Why does vertical line appear on documents using ADF as source

Why does vertical line appear on documents using ADF as source

If I copy from the flatbed everything works fine. However if I copy or scan using the ADF, then a black vertical line appears down the center of the output document.

Asked by: Guest | Views: 97
Total answers/comments: 2
Guest [Entry]

It took spraying condensed air on the rollers to clear up my problem.
Guest [Entry]

Tried wiping the ‘small glass panel on left’ with a dry cloth but this didn’t help. Went at it again with a cloth dampened with alcohol screen cleaner and problem solved.