NEC POWERMATE VP Manual page 130

6-16 Adding Options
If you have any cables connected to the board, label the
1.
connectors. Then disconnect the cables.
Remove the screw that secures the expansion board to
2.
the rear of the system.
Removing the inside expansion board screw
Pull the board out of the connector. You might have to
3.
gently rock the board from side-to-side to release it
from the connector.