After confirming that the print head holder has moved to the center and stopped moving, remove all ink tanks.
Raise the print head lock lever and remove the print head.
Re-seat the print head into the print head holder and lower the print head lock lever until a click is heard.
Insert the appropriate ink tank into the slot at the right end and push down on the PUSH mark on top of the ink tank until a click is heard. Install the other ink tanks in the same manner.