Canon iPF671 Service Manual page 181

2) Remove the left/right cover and left/right ink tank cover.
3) Remove one screw [1], and then remove the carriage upper cover [2].
4) Remove the spring [1], release the notch from the protrusion [2] on the side plate, and then remove the linear scale [3] from the left side.
[1]
[2]
F-4-105
[3]
[1]
[2]
F-4-106
Chapter 4
4-45