Canon MP640 Service Manual page 28

4) Remove the operation panel unit from the base (4 screws).
<For the hinge cable core position and cable layout, see the photos below. Use the longnose pliers in disengaging the
hinge and in releasing the spring.>
5) Remove the panel board (10 screws).
6) When replacing the Easy-Scroll Wheel, always replace the entire wheel with a new one, since grease is already applied to it.
25 / 54