Brother HL-2400C Service Manual page 510

USER'S GUIDE
5-38
Notes

When you install less than two SIMMs, be sure to install them in the
order Slot 1and then Slot2.

When you install different capacities of SIMMs, be sure to install the
larger capacity SIMMs in the lower socket and smaller capacity
SIMMs in order in the upper sockets.
6. Install the main controller board into the printer by sliding it into the
guide rails.
Fig. 5-43 Install the Main Controller board
7. Secure the main controller board with the two screws.
8. Reconnect the interface cable (printer cable) from your computer.
Plug the power cord into the AC outlet and turn the printer on.
9. To check whether the SIMM has installed correctly, you may perform
a Test Print "Print Configuration" which will print the current
memory size.