Clean the scanner glass and make sure that there are no foreign materials adhering to it.
After you select Scan from the printer display, choose the computer that you want to scan to from the list of printers on the printer display.
If you have a wireless connection from your printer to your computer, and you want to always be able to quickly scan to your connected computer, make sure to have Scan to Computer always active.
If you want to scan a document with several pages into one file instead of multiple files, start the scan with the printer software instead of selecting Scan from the printer display.