Canon MB5450 Series Online Manual page 1258

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Cause
Protective material or tape may still be attached to print head holder.
What to Do
Open the front cover and make sure the protective material and tape have been removed from the print
head holder.
If the protective material or tape is still there, remove it and close the front cover.
If this does not solve the problem, contact your nearest Canon service center to request a repair.
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