To ensure safe and secure download, we recommend obtaining the Canon Service Tool V3900 from authorized sources:
Look at the top right to verify your printer is detected in the dropdown. Find the Ink Absorber Counter section. Select MAIN from the Absorber pull-down menu. Click the Set button right next to it.
To use the tool, your printer . If it is not in this mode, the software will not communicate with the device. Step 1: Entering Service Mode Turn off the printer but keep it plugged into power. Press and hold the Stop/Resume button (red triangle). While holding Stop/Resume, press and hold the Power button. Release the Stop/Resume button (while still holding Power).
Press the button 5 times (6 times for some MG series models). Release the Power button.