Brother HL-4000CN Service Manual page 145

2.1.9 Cover side L
1) Remove 1 screw securing the rear of cover side L to the printer.
2) Release the hook securing the cover side L at the front edge of the printer.
3) Remove the cover side L from the printer.
Screw, tapping M3x8
2.1.10 Cover ASSY top print head cartridge
1) Open the cover ASSY top print head cartridge.
2) Extract the right and left stud top securing the cover ASSY top print head cartridge to
the printer.
3) Remove the cover ASSY top print head cartridge from the printer.
Stud top
Cover side L
Fig.4-17
Fig.4-18
IV-13
Cover ASSY top print head cartridge
Stud top