Canon BJ-10sx - Manual (Page 19)

8. Push the lock lever back until it snaps into place. This
secures the ink cartridge so it makes contact with the
circuit board on the cartridge holder.
CAUTION: Do not move the ink cartridge after installing it.
Moving the ink cartridge to the right and leaving it there may
uncap the print head and cause it to dry out.
9. Close the inner cover. Press on each side until it snaps into
the closed position.
10. Lower the top cover and press on each side to close it
securely.
Whenever you turn off the printer, the ink cartridge moves to its
home position on the left and caps itself to keep from drying out.
If you unplug the printer while it is printing, or if you move the
ink cartridge from the home position, the cartridge will not be
capped and it may dry out.
Attaching the AC adapter
CAUTION: Use only the AC adapter that came with the
printer. Use of any other adapter may damage the printer.