Canon WS8400 Service Manual page 118

Chapter 4
11) Remove the five screws [1] and detach the carriage cover [2].
12) Disconnect the three flexible cables [3] on the carriage relay PCB.
13) Remove the clamp securing the ink tube and remove the ink tube unit from the frame paying attention to ink splash and contact with the linear scale.
b) Reassembling the ink tube unit
After replacing the ink tube unit, turn on the power with the print head and ink tank uninstalled, install the print head and ink tank according to the messages,
and then fill the ink tank with ink.
4-18
[1]
F-4-43
[1]
[3]
F-4-44
[2]
[2]
[1]