Cause
The 1681 error indicates that two ink tanks of the same color are installed. The light that is flashing will indicate which ink tank needs to be replaced.
![](/library/CANON/CITS_TECH_SUPPORT/Printers/Ink/more_than_1_of_same_type_installed.JPG)
Action
Make sure the ink tanks are installed with the correct colors in each position.
Get a full list of support codes for this printer.