| Problem | Likely Cause | Solution | |--------|--------------|-----------| | Tool says "Cannot communicate" | Printer not in Service Mode | Repeat entry procedure carefully. | | Tool crashes on Windows 10/11 | Missing DLL or compatibility | Run in Windows 7 Compatibility Mode. | | Reset works, but error returns next day | Physical waste ink pad is actually full | You must open printer and clean/replace the physical pad. | | Buttons are grayed out | Wrong tool version for your printer | Find an earlier (V.3400) or later (V.4000) version. |
The Canon Service Tool is a proprietary maintenance utility used by Canon authorized service centers. It is not intended for public use. However, iterations of this software—such as versions V3400, V3600, and the widely sought-after V3900—have leaked onto the internet.
The primary function of this tool is to communicate directly with the printer's firmware to reset internal counters. The most common use case is resetting the Waste Ink Pad Counter.
Once you have downloaded the tool, follow these instructions precisely. One wrong click can disable your printer. Canon Service Tool V.3900 Download
What you need:
The Reset Procedure:
Run the Tool (as Administrator):
Check Current Status:
Reset the Waste Ink Counter:
Clear EEPROM (Optional but recommended): | Problem | Likely Cause | Solution |
Exit Service Mode:
Your printer should now function as if new. The error message will be gone.