Lenovo ThinkCentre 3231 Hardware Maintenance Manual page 110

2. At the rear of the computer, press the release button 1 to open the adapter
Figure 17. Removing the adapter card
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Hardware Maintenance Manual
latch 2 and remove the adapter card by pulling it straight out of the adapter
card slot.
Notes:
a. The adapter card fits tightly into the card slot. If necessary, alternate moving
each side of the adapter card a small amount until it is removed from the
adapter card slot.