Canon BJC-4400 Series User Manual page 69

Press the lock
lever down
completely;
do not use
excessive force.
C
Do not manually move the mechanism that houses the
BJ cartridge. Attempting to move the BJ cartridge holder will
damage the printer.
Chapter 4
Make sure the marks on the lever and the cartridge holder
align.
The BJ cartridge is now positioned and locked.
BJ CARTRIDGE
HOLDER
LOCK LEVER
Maintaining the Printer 4-15