Oki C 5200n - Manual (Page 64)

INSTALLING UPGRADES > 64
4. Print a menu map as follows:
(a) Press the + button to access the Information Menu.
(b) Press ENTER once for the menu map.
(c) Press ENTER again to print the menu map.
(d) When the menu map is printed, press ON LINE to exit the
menu system.
5. Examine the first page of the menu map.
Near the top of the page, between the two horizontal lines, you
will see the current printer configuration. This list should
indicate that the duplex unit is now installed.
All that remains is to adjust the Windows printer driver to make
full use of the new features.