Brother MFC990CW Service Manual page 199

(7) Open the scanner cover at approx. 80° and pull it to the rear and off the machine.
CIS 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
Scanner cover
(Scanner unit)
CIS flat cable
Flat core
Scanner cover
damper
Scanner cover
support
6-15
Upper cover
Lower cover
(6_13)
Chapter 9, Section
Chapter 9, Section 9.1.4.17.
Confidential