Canon imagePRESS C10000VPSeries Troubleshooting Manual page 194

14) Lift up the process unit to demount from the rails while holding the red-circled area of the process unit.
15) Place the process unit [1] in the stable place to remove 1 (one) screw [2].
16) Hold the harness guide [a] like the photo below and release it from 2 claws [b] to be free.
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