Brother MFC990CW Service Manual page 192

(3) Disconnect the CIS flat cable from the main PCB, pull it to the rear through the flat core,
and then release it from the cable guides. Unlatch the flat core and take it out of the upper
cover.
NOTE: After disconnecting the flat cable(s), check that each cable is not damaged at its
end or short-circuited. When connecting the flat cable(s), do not insert it at an angle. After
insertion, check again that it is not at an angle.
(4) Release the grounding wire by removing the screw.
(5) Disconnect the following harnesses from the main PCB.
- ADF motor harness (4-wire)
- CIS motor harness (4-wire)
- Document front sensor harness (3-wire)
- Document rear sensor harness (3-wire)
Grounding wire
Document
front sensor
harness
CIS motor harness
MFC990CW/790CW/490CW
Document front
sensor harness
CIS motor
harness
ADF motor
harness
Scanner cover
(Scanner unit)
Taptite, cup S
M3x6
Document rear
sensor harness
Main PCB
Document
rear sensor
harness
6-8
CIS flat cable
Lower cover
Latch
Document rear sensor harness
ADF motor harness
MFC290CW and DCP185C
ADF motor
harness
Main PCB
Document
front sensor
harness
CIS motor
harness
Flat core
Upper cover
(6_05)
Confidential