Canon imageRUNNER ADVANCE 715iF III Series Service Manual page 149

4. Parts Replacement and Cleaning
[1]
8. Remove the ADF Unit [1] while removing the Harness Cover [2].
[1]
[2]
CAUTION:
When installing the ADF Unit [1], be sure to insert the rib [A} of the Harness Cover into the guide [B] of the Reader Unit.
[B]
[A]
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