Brother MFC-9420CN Service Manual page 105

(7) Remove the two pressure rollers from the pressure roller shaft.
(8) Open the ADF unit.
(9) Release the hook to remove the gear cover from the ADF unit.
A DF unit
Gear cove r
Hook
Pressure roller shaft
Fig. 5-16
Gear cove r
Fig. 5-17
5 -1 6
Pressure roller
Confidential