Canon iPF671 Service Manual page 168

Chapter 4
Removing the Left Ink Tank Unit
1) Perform ink drainage. Refer to "Disassembly/Reassembly > Points to Note on Disassembly and Reassembly > Draining the ink".
2) Remove the left cover, left ink tank cover, and front cover.
3) Remove four screws [1] and disconnect two connectors [2], and then remove the cable from the cable guide.
4) Remove the joint [3] between the ink tube unit and ink tank unit carefully, the ink tube from the guide, and then remove the left ink tank unit [4].
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[2] [1]
F-4-71
[4]
[1]
F-4-72
[3]