Brother mfc8440 Service Manual page 194

8) Remove the two cup S M3x6 Taptite screws, and then remove the NCU unit.
NCU unit
Taptite, cup S M3x6
9) Disconnect the heater harness and thermistor harness.
10) Remove the bind B M4x12 Taptite screw and the shoulder screw, and then remove the
fixing unit.
Shoulder screw
Heater harness
Taptite, bind B M4x12
Fig.5-18
Fixing unit
Fig.5-19
5-13
MFC-8440/8840D/8840DN, DCP-8040/8045D/8045DN
Thermistor harness
SERVICE MANUAL