IBM H Series Installation And Service Manual page 296

2. Align the card with the card connector on the system board and firmly press both
of the camming latches at the same time to insert and seat the card into the
connector.
To replace, perform the removal steps in reverse order.
Attention: If you do not close both latches at the same, you may damage the card
or the card connector.
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RS/6000 Enterprise Server Model H Series Installation and Service Guide