Canon 3749B002 On-Screen Manual page 111

Do not touch the open ink port once the protective cap is removed, as this may prevent the ink
from being ejected properly.
5.
Install the new ink tank.
Insert the front end of ink tank into the Print Head at a slant.
(1)
Make sure that the position of the ink tank matches the label.
(2) Press the mark
place.
Make sure that the ink lamp lights up red.
Important
You cannot print if the ink tank is installed in the wrong position. Be sure to install the ink tank in
the correct position according to the label on the Print Head Holder.
You cannot print unless all the ink tanks are installed. Be sure to install all the ink tanks.
6.
Close the Scanning Unit (Cover) gently.
Caution
Be sure to hold the Scanning Unit (Cover) firmly using both hands, and be careful not to get
your fingers caught.
Important
Do not hold the LCD or the Operation Panel.
Note
If the error message appears after the Scanning Unit (Cover) is closed, refer to "
Troubleshooting" in the on-screen manual: Advanced Guide .
When you start printing after replacing the ink tank, the machine starts cleaning the Print Head
automatically. Do not perform any other operations until the machine completes the cleaning of
(Push) on the ink tank until the ink tank snaps firmly into