Brother MFC990CW Service Manual page 194

(8) Open the scanner cover at approx. 80° and pull it to the rear and off the machine.
CIS motor
harness
Document front
sensor harness
Document rear
sensor harness
ADF motor harness
Assembling Note: If you replace the scanner cover, specify the CIS type into the
EEPROM in the maintenance mode (Function code 59), referring to
9.1.4.19. After that, acquire the white level data and set the CIS scanner area in the
maintenance mode (Function code 55), referring to
CIS flat cable
Flat core
Grounding
Scanner cover
wire
damper
Scanner cover
support
6-10
Scanner cover
(Scanner unit)
Lower cover
Chapter 9, Section
Upper cover
(6_07)
Chapter 9, Section
9.1.4.17.
Confidential