The Service Tool will not work unless the printer is in "Service Mode." You cannot simply open the program while the printer is on normally.
Press and hold the button (usually a red triangle inside a circle). Canon Service Tool V5204 Download
Below is a solid guide covering compatibility, download precautions, and usage instructions. The Service Tool will not work unless the
: G1000, G2000, G3000, G4000, G1400, G2400, G3400 and usage instructions. : G1000