Canon PIXMA MG6120 Service Manual page 29

(6) Carriage unit removal
1) Unlock the carriage while following the procedures (4) Carriage unlocking.
2) On the main chassis, mark the positions of the screws that fix the carriage upper rail to the main
chassis (3 points for each screw: the left, right, and center).
3) Remove 3 screws that fix the carriage upper rail to the main chassis, then remove the rail.
4) Slowly slide the carriage unit to where the main chassis is cut as shown in the photo below.
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