Canon PIXMA MG6120 Service Manual page 23

3) Remove the scanner cable, panel cable, and FB motor cable.
<Be cautious of the core location and wiring layout.>
4) Remove the side cover L, scanner unit, then document pressure plate unit (3 screws).
<While holding the scanner unit, remove the side cover L, then disengage the scanner unit from
the scanner support arm.>
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