Brother DCP-7057 Service Manual page 247

(2) Place the develop drive sub ASSY as shown in the figure below.
(3) Be careful not to damage the Hooks of the develop joint and release the hooks to
remove the develop joint, and then remove the develop joint spring and the develop gear
joint/52.
Develop drive sub ASSY
Develop joint
Develop joint spring
Fig. 3-92
3-103
Hooks
Develop gear joint/52
Confidential