Canon Pro-1000 series Online Manual page 763

1890
Cause
Protective material or tape may still be attached to print head holder.
What to Do
Open the top 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 top cover.
If this does not solve the problem, contact your nearest Canon service center to request a repair.
763