NEC Express5800/120Rd-2 Service Manual page 287

Disassembly and Reassembly 7-43
9. This step is required only for a PCI board of the full-height/full-length type.
Close the card retainer clip to lock the card.
Board retainer clip
Hole
Hook
Close the retainer clip to lock the card.
10.
Retainer clip
Retainer clip
Lock tab
Lock tab
Low-profile type
Full-height type