On some Canon Pixma printer models, the ink collector counter cannot be reset using a key combination. Some users therefore use the “Service Tool V3400” software.
However, this is not an official Canon program. Its use is therefore not entirely risk-free. If you download it directly from the Internet, be sure to check it for viruses or Trojans as a precaution.
The program recognizes many Pixma models from the IP, MP, MX and MG series. For the tool to work, the printer must be connected to a computer via USB and be in maintenance mode. The function for resetting the counter can be found under “Ink Absorber Counter”.