Lenovo ThinkCentre 3231 Hardware Maintenance Manual page 158

5. Remove the optical drive retainer from the old optical drive and then install it
on the left side of the new optical drive.
Figure 60. Installing the retainer
6. Install the new optical drive into the bay until it snaps into position.
Figure 61. Installing the optical drive
7. Connect the signal and power cables to the rear of the optical drive.
8. Go to "Completing the FRU replacement" on page 158.
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Hardware Maintenance Manual