Canon PIXMA G5020 Wireless MegaTank Printer - Manual (Page 406)

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Cause
The remaining ink level in one of the ink tanks may have reached the lower limit line shown on the ink
tank.
What to Do
To check the remaining ink level, visually inspect the remaining ink in the ink tank.
If the remaining ink level is below the lower limit line, refill the ink tank to above the single dot shown on
the ink tank with the corresponding color of ink.
Refilling the ink tank to the upper limit line improves the accuracy of detection of the remaining ink level.
Refilling Ink Tanks
If printing is continued when the remaining ink level is below the lower limit line, the printer may consume
a certain amount of ink to return to printable status and may also become damaged.
To continue printing, press the printer's OK button.
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