Canon Laser Class 700 Series Reference Manual page 188

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6-26 Refilling the Stamp Ink Compartment (Optional)
CF-PL Reference Guide_USEN HT1-2187-000-V.1.0
Lower the ADF cover until the black, plastic loop is even with
the stub on the machine.
Place the end of the black, plastic loop over the end of the
stub, so that it stays in place.