Canon PIXMA MX870 - Manual (Page 138)

Important
Do not push the sides of the ink tank. If you push the sides of the ink tank with the L-shape
air hole (D) blocked, ink may splash.
Do not touch the inside of the orange protective cap (E) or the open ink port (F). The ink
may stain your hands if you touch them.
Do not reattach the protective cap (E) once you have removed it. Discard it according to
the local laws and regulations regarding disposal of consumables.
5. Install the new ink tank.
(1)
Insert the front end of ink tank into the Print Head at a slant.
Make sure that the position of the ink tank matches the label.
(2)
Press the mark (Push) on the ink tank until the ink tank snaps firmly into
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.
Page 138 of 1127 pages Replacing an Ink Tank