Canon MG6600 Series Manual page 695

1890
Cause
The protective material for the print head holder or the tape may remain attached to the holder.
Action
Open the operation panel, then confirm that the protective material or the tape does not remain attached
to the print head holder.
If you find the protective material or the tape remains attached, remove it, then close the operation panel.
If the problem is not resolved, contact the service center.
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