To use the tool, Arthur had to perform a precise "digital handshake" to put the printer into : Service Tool V3400.exe - Google Groups
Before running the tool, you must put your printer into . 1. Download and Extract canon service tool v3400.zip
Turn off the printer (but leave it plugged into the power source). Press and hold the button (red circle). Press and hold the Power button. To use the tool, Arthur had to perform
If you reset the counter multiple times without replacing or washing the physical felt pads, excess ink will eventually overflow out of the bottom of the printer casing, potentially damaging your desk, carpets, or internal electronic circuits. Consider opening the bottom panel to wash and dry the pads, or route the waste ink tube to an external bottle. Press and hold the button (red circle)
Many users have reported success with the v3400 tool, but the results are highly model-specific.
Ensure no other printing jobs are stuck in the Windows print queue. Disconnect all other USB devices (like external hard drives or webcams) to prevent USB bus conflicts. Important Safety Warning: Physical Ink Overflow
The Ultimate Guide to Canon Service Tool v3400: Resetting Your Printer's Waste Ink Pad Counter