Lexmark C734 Service Manual page 274

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5.
Engage the gears (D) on the right side of the COD.
6.
Replace the five screws (E).
7.
Verify the actuators can be seen by looking inside the printer at the triangular holes, as in step 2.
8.
Check to make sure you can rotate the large COD gear from stop to stop.
9.
Reconnect the cable connector to JBOR1 connector on the system board.
10.
Reinstall the top cover assembly, the fuser, and the covers.
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Service Manual