Brother HL-4000CN Service Manual page 61

6) Hold the print head cartridge by the handle and align the bottom roll at the other side
of the cartridge with the front groove of the printer indicated by the arrow. Then
lower the cartridge slowly.
Note:
Do not touch the intermediate transfer roll.
The cartridge may be damaged if lowered when the groove and shaft are not aligned well.
Make sure that the surface of the intermediate transfer roll does not contact other
parts.
7) Close the delivery section cover.
8) Close the front cover.
Intermediate transfer roll
Fig.2-20
Fig.2-21
Fig.2-22
II-8