One of the following situations may be the cause.
Solutions
Clean the paper path.
Cleaning the Paper Path for Ink Smears
Remove any dust or dirt from the originals, and clean the scanner glass.
Cleaning the Scanner Glass
Clean the ADF, and remove any dust or dirt from the originals.
Cleaning the ADF
If you press with too much force, blurring, smudges, and spots may occur.
Do not press with too much force on the original or the document cover.
Placing Originals
Lower the copy density setting.
Menu Options for Copying