Brother HL-3450CN - Manual (Page 173)

CHAPTER 6 OPTIONS
6-17
5. Fit the 4 HD-6G/HD-EX shoulder
screws into the 4 holes of the
main controller board, and then
secure the shoulder screws with
the screws provided from the rear
of the PCB.
Fig. 6-23
6. Connect the flat cable to the main
controller board.
Fig. 6-24
7. Install the main controller board
into the printer by sliding it into
the guide rails.
Fig. 6-25
8. Secure the main controller board with the 2 screws.
9. Reconnect the interface cable to the printer. Plug the power cord into the
AC outlet, and then turn on the printer.
10. Format the HD-6G/HD-EX from the control panel. See Chapter 4 for
details.