Canon PRO-100S series Online Manual page 555

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Cause
If the lamp on the ink tank is flashing, ink may have run out.
Action
Replacing the ink tank is recommended.
If printing is in progress and you want to continue printing, press the printer's RESUME/CANCEL button
with the ink tank installed. Then printing can continue. Replacing the ink tank is recommended after the
printing. The printer may be damaged if printing is continued under the ink out condition.
Note
• If multiple ink lamps are flashing, check the status of each ink tank.
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