Canon S400 Reference Manual page 115

Replacing Ink Tanks
2
To remove the empty ink tank, press in on the tab on the ink tank to release
and pull it out of the slot.
Do not remove the BJ Cartridge! Leave the BJ Cartridge installed in the
printer and remove only the ink tank(s).
Fix tab
Discard empty ink tanks according to the local laws and regulations regard-
Note
ing disposal of consumables.
Important
To avoid staining your hands, clothing, or areas of the work site, do not
shake or drop ink tanks.
Routine Maintenance 115