Brother MFC990CW Service Manual page 236

(2) Disconnect the Bluetooth PCB from the main PCB.
(3) Remove the three screws (two "a" and one "b" screws) from the main PCB shield and lift it
up.
Main-MJ (EXT) harness
SDAA enclosure
Main-MJ (LINE) harness
*
ASF motor harness
Carriage motor
harness
Paper feed motor harness
PF encoder/registration
sensor harness
Assembling Notes: Before securing the main PCB shield, route the harnesses on the top of
the lower cover as shown below. Make sure that the main-MJ (EXT) harness
MJ (LINE) harness
on page 6-55 for the routing of those harnesses on the left side of the lower cover.)
Carriage motor harness
Power supply
harness
Power supply
harness
Main PCB shield
1
*
1
*
1
Power supply harness
*1
are routed through the SDAA enclosure
Main-MJ (LINE)
harness (yellow)
Paper feed motor
harness
PF encoder/registration
sensor harness
6-52
*1 For MFC only
*2 For models with handset
*3 For Bluetooth support models
"b"
"a"
Purge cam switch harness
Lower cover
Main PCB
Hook switch harness
SDAA enclosure
1
*
Main PCB
Hook switch
harness
2
*
"a"
Bluetooth PCB
Cap lift cam switch harness
ASF encoder harness
Ink cartridge detection
sensor harness
Ink empty sensor harness
"a": Taptite, cup S M3x6
2
*
"b": Taptite, cup B M3x10
(6_46)
*1
and main-
*1
. (See the illustration given
1
*
1
*
Main-MJ (EXT)
harness (black)
ASF motor
harness
(6_48)
3
*
Confidential