BROTHER DR3400 RESET DRUM

HL-L5000D/HL-L5100DN/HL-L5200DW/HL-L5200DWT/HL-L6200DW/HL-L6200DWT
  1. Make sure the machine is turned on.
  2. Open the front cover.
  3. Press and hold OK for about two seconds to display the [Drum Unit] option, and then press OK.
  4. Press for [Reset] to reset the drum counter.
  5. Close the front cover of the machine.