Canon BJC-6000 Series Setup Instructions page 6

Step 6: Install The BC-30 Black BJ Cartridge
1. Raise the blue lock lever on the left side of the cartridge holder.
2. Remove the BC-30 Black BJ Cartridge from its box.
Remove the orange protective cap from the print head, and then remove the orange tape.
Do not attempt to replace the cap on a BJ cartridge.