Oki C9300 User Manual page 205

Installing additional memory
If the maximum amount of memory is being installed in the
printer (three 256 MB modules), the memory modules that
were originally installed must be removed.
1. Switch off the printer and disconnect the power cable and printer
interface cable.
2. Loosen the two screws (1) and remove the main board.
3. Insert the memory modules the slots as follows: push out the
white tabs at either end of the socket.
NOTE
C9300/C9500 Accessories • 203