Canon PRO-10 Series Manual page 115

Important
Do not push the sides of the ink tank. If you push the sides of the ink tank, ink may splash.
Do not touch the inside of the orange protective cap
stain your hands if you touch them.
Do not reattach the protective cap
local laws and regulations regarding disposal of consumables.
4.
Remove the ink tank with the lamp flashing fast.
Push the tab (D) and lift the ink tank to remove.
Important
Do not touch other parts besides the ink tanks.
Handle the ink tank carefully to avoid staining of clothing or the surrounding area.
Discard the empty ink tank according to the local laws and regulations regarding disposal of
consumables.
Note
Do not remove two or more ink tanks at the same time. Be sure to replace ink tanks one by one
when replacing two or more ink tanks.
For details on ink lamp flashing speed, see
5.
Install the new ink tank.
(B) or the open ink port (C). The ink may
(B) once you have removed it. Discard it according to the
Checking the Ink Status with the Ink Lamps.