Fix Error Code U071 Canon Pixma MP830

1. Open the printer and remove all ink tanks.
2. Insert a single ink tank in the printer then close the cover.
3. Confirm whether the printer recognizes the installed tank properly. If it does, it will indicate it does not detect the other ink tanks, as they are not currently installed in the printer.
4. Repeat steps 1-3 with another ink tank.

5. If the printer at any time indicates two of the same ink tanks are installed, the cause will be the last tank installed. For example, if you inserted an ink tank earlier, and you later inserted another ink tank, and it said two of the same inks were installed, the cause of the issue is the last ink tank.

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