Brother DCP-9055CDN Service Manual page 237

(5) Open the Scanner unit. Remove the Ferrite core 1 from the Document scanner unit
harness.
Document scanner unit harness
Ferrite core 1
(6) Remove the Document scanner unit harness and Second side CIS harness from the
Ferrite core 2 and 3 attached to the Film.
Document scanner unit harness
Ferrite core 2
Film
Ferrite core 3
Scanner unit
5b
Document scanner
unit harness
Fig. 3-53
Film
Second side
CIS harness
Document scanner
unit harness
Fig. 3-54
5a
Ferrite core 1
Scanner unit
Second side CIS harness
3-56
Main body
Confidential