Canon BJC 7000 - Manual (Page 53)

If the results of the Nozzle Check Pattern are not satisfactory, repeat these steps in
the following order:
1. Clean the print head.
2. Print the Nozzle Check Pattern.
3. Deep clean the print head.
4. Print the Nozzle Check Pattern.
If the problem has not been corrected after deep cleaning the print head four or five
times, replace the print head.
BJ Cartridge Guidelines
The printer's cartridge holder holds two BJ cartridges, one BC-60 Black BJ
Cartridge and either one BC-61 Color BJ Cartridge or one BC-62 Photo BJ
Cartridge.
o BC-60 Black BJ Cartridge
Contains the print head unit and black ink only. When you run out of
black ink, you replace the complete cartridge.