Canon BJ-200ex - Manual (Page 87)

Avoid touching the yellow mounting base on which you place the
cartridge--especially the circuit board on the side of the mounting
base and the film cable that extends from the catridge holder.
6. Push the lock lever down until it locks into place.
§ Use one hand only to set the cartridge in
place and press the lock lever down
§ Make sure there is no resistance when you
press on the lock lever. The lever should
lock easily into place.
§ If you hear snapping noises or feel any
resistance as you press down on the lever,
remove the ink cartridge and try again.
7. Be sure no gap exists between the ink cartridge and
cartridge holder.
§ When secure, the ink cartridge makes
contact with the circuit board inside the
cartridge holder.