Follow Solutions to Fix Canon Printer Error 1688:
The issue is not as big as it seems and can be resolved easily following some simple steps
Step 1: Click on START button and open CONTROL PANEL.
Step 2: Select Printers and Faxes on the computer system
Step 3: Open up the Maintenance Program; select Canon Printer Preferences in Dialog box.
Step 4: Check the INK Leven warning indicator in the maintenance section.
Step 5: Disable the Ink level warning indicator by selecting the Radio Box next to the option. By doing so, you will disable the warning message, resisting it from appearing on the screen again.
Step 6: Click on “APPLY” to save the changes and close the dialog box.
Solution 2: Holding Stop/Reset/Resume button for five seconds
A series of Canon printers allows users to continue printing on a single button press. User can hold down Stop/Reset/Resume for five seconds and then release it. By doing so, you can continue printing regardless of the low or empty cartridge estimate.