Brother DCP-L8400CDN Service Manual page 257

(6) Align the Second side CIS flat cable to the angle of the Rib of the Flat cable holder and
pass it through the Flat cable holder as shown in the figure below, and then affix it to the
double-sided adhesive tape affixed to the Flat cable holder.
Flat cable holder
Pass the harness through here.
Second side CIS flat cable
Rib (Align the folded area to this part.)
Fig. 3-108
3-93
<To be connected to
Second side CIS unit>
Flat cable holder
Affix it to the double-sided
adhesive tape.
Second side CIS flat cable
Confidential