Canon PIXMA G3520 Online Manual page 429

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Cause
Printer error has occurred.
What to Do
Check the remaining ink level, and then refill the ink tank if necessary.
Turn off the printer and unplug it.
Wait about 10 minutes and then plug in the printer again and turn it back on.
If the ink tank is refilled because it runs out of ink, perform ink flush.
• From Windows:
Cleaning the Print Heads
• From macOS:
Cleaning the Print Heads
• From the operation panel of the printer:
How to Perform Ink Flush
If this does not solve the problem, contact your nearest Canon service center to request a repair.
Important
• Do not tilt the printer when moving it since the ink may leak out.
• When transporting the printer for repairing it, see Repairing Your Printer.
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