Lexmark X543 Service Manual page 220

7525-xxx
3.
Be sure the shaft and bearing have not shifted out of the guide, and that the bearing on the left is aligned
with the slot (C) facing down (towards the front door).
Note: Improperly aligned bearings or shafts incorrectly seated may cause vibration and noise in the front
door.
4.
Align the duplex aligner guide so the gears (D) mesh on the left.
5.
Replace the eight screws in the duplex aligner.
6.
Close the front door.
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Service Manual