Brother HL-3400CN Series User Manual
Page 218

CHAPTER 5 MAINTENANCE
5-61
7. Install the main controller board into the printer by sliding it into the
guide rails.
Fig. 5-81 Install the main controller board
8. Secure the main controller board with the 2 screws.
9. Connect the printer interface cable, AC power cord and turn the
printer on.
10. Format the HDD from the control panel. See
for details.
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