You cannot run the tool while the printer is in normal "ready" mode. You must trigger Service Mode:

The tool is intended for professional servicing, specifically to:

| Function | Description | |----------|-------------| | Waste Ink Pad Counter Reset | Resets the absorber counter after physical pad replacement or redirection to an external tank. | | EEPROM Operations | Read, edit, or clear the printer’s EEPROM (stores nozzle check patterns, serial number, region settings, error logs). | | Ink Absorption Setting | Adjust the volume of ink used during cleaning cycles. | | Print Head Deep Cleaning | Execute more aggressive cleaning than standard driver utilities. | | Firmware Downgrade/Upgrade | Flash custom or older firmware versions (rare, highly risky). | | Ink Cartridge Chip Reset | Reset some chip-based counters (model dependent). |

Assuming you have accepted the risks and downloaded a clean version of the tool, follow this guide meticulously.

| Feature | Canon Service Tool v5204 Portable | Canon Official Service (via center) | |--------|-----------------------------------|--------------------------------------| | Cost | Free (unofficial) | Labor + parts ($50–150) | | Warranty impact | Voided | Maintained | | Hardware replacement guidance | None (user must know pad replacement) | Included | | Risk level | High (bricking, ink damage) | Zero (trained technicians) | | Firmware updates | Possible but dangerous | Safe, official |