Canon BJC-4200 - Manual (Page 55)

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The following procedure describes how to replace the BC-21 Color BJ Cartridge
with the optional BC-20 Black BJ Cartridge. Follow the instructions in this section to
replace an old BJ cartridge or to change BJ cartridges when you are switching
between the BC-21 and any of the optional BJ cartridges.
You only need to replace the BC-21 Color BJ Cartridge when the print head is
damaged (or after printing approximately 2000 pages). If one of the ink tanks (either
color or black) in your BC-21 Color BJ Cartridge is out of ink, see the next section
(page 4-18) for instructions on how to replace an ink tank.
Before starting, make sure the printer's power is on.

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{ Use both hands to grasp the sides of the cover and pull it toward you.

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{ The printer beeps and moves the cartridge holder to the center of the
printer.
{ The power light blinks while the cartridge holder is positioned in the center
of the printer.