Canon Printer Error Message 1688 is the indicator of low ink warnings. You can find sufficient instructions with Canon Printer Customer Support to fix the error
Step 1: Tap to ‘Start’ button and after that move to ‘Control Panel’ and then ‘Printers’ and ‘Faxes’ option. Then choose the Canon printer from the menu.
Step 2: In the dialogue box to open up the maintenance program choose the Canon Printer Preferences.
Step 3: In the maintenance section put ink level warning pointer.
Step 4: Tap to disable ink level warning pointer through choosing the radio box next to this option. It will prevent you to warning message as it appears on your screen.
Step5: Tap to “Apply” and after that close the dialogue box.