Canon iB4100 series Online Manual page 668

1754
Cause
The ink tank is not installed properly.
What to Do
Open the front cover.
Then push the ink tank.
After installing the ink tank properly, close the front cover.
If this does not solve the problem, contact your nearest Canon service center to request a repair.
Important
• The ink tank that was once installed cannot be removed until the ink runs out.
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