Canon BJC-55 Series, Service Manual

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f) Replacing the ink cartridge
The ink cartridge of the black BJ cartridge and color BJ cartridge can be replaced.
(BCI-10, BCI-11 Bk, BCI-11 color)
1) Ink cartridge replacement criteria
If the ink runs out or if more than six months have passed after the BJ cartridge
was unsealed and the print quality is not improved by performing cleaning once or
twice, the ink cartridge should be replaced with a new one. Since the color ink
cartridge contains three color inks, it must be replaced if one of them runs out.
If the print quality does not improve after replacing the ink cartridge,
perform head refreshing once or twice. If the print quality does not still
improve, the BJ cartridge must be replaced with a new one.
2) Removing the ink cartridge
Open the printer head cover, and press the CARTRIDGE button to move the
carriage to the BJ cartridge replacing position. Lift off the ink cartridge while
holding down its tab.
Ink adheres to and around the ink cartridge's ink inlet, so handle the ink
cartridge carefully not to stain your hands or clothes.
3-7
BJC-50
Part 3: Operating Instructions
Color BJ Cartridge Black BJ Cartridge
Figure 3-8 Replacing the Ink Cartridge