Canon BJ-10sx - Manual (Page 63)

4. Unpack the new ink cartridge from its protective
packaging. Snap off the orange cap from the print head
and then remove the orange tape.
5. Fit the ink cartridge over the yellow mounting base with
the print head facing the back of the printer.
CAUTION: Avoid touching the yellow mounting base on which
you place the cartridge -- especially the circuit board on the side
of the mounting base and the film cable that extends from the
cartridge holder.