NEC Express5800/140Rc-4 User Manual page 328

9-42 Upgrading Your Server
5.
Push the tab to unlock it, slowly open the tab, then remove the PCI board.
IMPORTANT:
Doing so could damage the tab.
NOTE:
They are for protecting the PCI board already been installed. Take care
not to remove or damage the insulator when installing or removing the
PCI board. If the insulator is taken off, reinstall the insulator in place.
6.
Slowly insert the PCI board into the server.
7.
Push the PCI board until the correction part of the board is firmly connected into the slot.
IMPORTANT:
Be careful not to apply excess force to the PCI board when handling it.
Applying excess force may cause damage to the PCI board.
Do not open the retention tab to 90 degrees or more.
The insulators are installed between the PCI board slots.
Tab
If failing to install the PCI board correctly, reinstall it.
Tab
Lock (for long card)
Lock (for long card)