Need to know how to change ink cartridges on the Canon Pixma MX340 printer? We’ve got you covered. This is one of those tutorials that are done best with video, so we’ve created one instead of struggling to describe the steps to you with words. The entire top of the printer lifts up. While the printer is on, grab below the words Canon on the black part of the printer and lift up. The cartridges will eventually slide to the center where you can access and replace them.