Canon iPF6100 Service Manual page 260

Chapter 4
3) Remove the three screws[3] and press two claws[1] in the joint of the waste ink tube in the arrow direction to remove the purge unit[2].
b) Precaution for mounting the purge unit
1) When attaching the waste ink tube, make sure that the waste ink tube has been firmly attached with the two projections[1] of the joint engaging to the each
hook[2].
If the waste ink tube has not been attached firmly, it causes the ink leakage.
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[1]
[3]
F-4-76
[1]
[2]
F-4-77
[3]
[2]