Brother HL-4000CN Service Manual page 146

2.1.11 Cover side R
1) Remove 1 screw securing the rear of cover side R to the printer.
2) Release the hook securing the cover side R at the front of the printer.
3) Remove the cover side R from the printer.
2.1.12 Cover rear
1) Lift the cover rear slightly, put it backwards and remove.
Fig.4-19
Cover rear
Fig.4-20
IV-14
Cover side R
Screw, tapping M3x8