Canon iX6800 Series Online Manual page 448

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The remaining ink level cannot be correctly detected. (The lamp on the ink tank flashes.)

Replace the ink tank and close the top cover.

Printing with an ink tank that was once empty may damage the printer.

If you want to continue printing in this condition, you need to release the function for detecting the

remaining ink level. Press and hold the printer's RESUME/CANCEL button for at least 5 seconds, and

then release it.

With this operation, releasing the function for detecting the remaining ink level is memorized. Please be

advised that Canon shall not be liable for any printer malfunction or damage caused by refilled ink tanks.