Hi donghuiyu,
This issue may occur if the ink cartridges are replaced prior to the ink being completely empty. It is recommended to only replace the ink when it shows the ink is completely empty. You can continue printing when the ink is low. If you replace the ink too soon, it will not register the fact that a new ink has been installed. You may continue to use the printer even though it's not indicating the ink cartridge is full. When you get an error stating that the ink is empty, just take the ink cartridge out, turn the unit off, turn it back on, and place the ink cartridge back inside. It should then update the ink levels accurately.
Alternatively, if you have an cartridge that is actually empty, you may be able to put it in the printer so it recognizes the empty tank and provides the ink tank empty warning. You would then replace it with the new ink cartridge and the printer should determine that it was replaced and provide a full ink level indication again.
In addition, if ink cartridges other than Canon geniuine ink cartridges are being used in the printer, or if the ink cartridges have been refilled, the printer may not recognize the ink levels properly. Replacing the ink cartridges with new Canon genuine ink cartridges should resolve the issue if third-party or refilled Canon ink cartridges have been used.
Hope this helps!
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