Canon IB4000 series Online Manual page 435

1890
Cause
The protective material for the print head holder or the tape may remain attached to the holder.
Action
Open the front cover, 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 front cover.
If the problem is not resolved, contact the service center.
435