Canon pro-10s series Online Manual page 439

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Cause
Ink may have run out (The lamp on the ink tank flashes).
Action
If printing is in progress, you are recommended to stop printing, replace the ink tank, and then print again.
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 under the ink out condition. Replace the empty ink
tank immediately 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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