Brother DCP-L8400CDN Service Manual page 244

Assembling Note:
There are cases where the ADF spring enters the Upper ADF chute from the mounting hole
of the ADF separation pad holder.
In this case, remove the Upper ADF chute from the ADF unit and take out the ADF spring.
In the case that the Upper ADF chute has been removed, be sure to assemble the
ADF spring and ADF separation pad holder, and then assemble the Upper ADF chute to the
ADF unit.
Hole
ADF spring
Upper ADF chute
Fig. 3-87
3-80
Confidential