Brother MFC990CW Service Manual page 237

(4) For MFC: Release the main-MJ (EXT) harness from the cable guides provided on the
SDAA enclosure. Press the right and left ends of the SDAA enclosure inwards and remove
it from the main PCB. Then disconnect the main-MJ (LINE) harness (2-wire, yellow) from
the main PCB.
(5) Remove the main PCB.
MFC990CW/790CW/490CW and DCP585CW: Remove four "c" screws from the main
PCB, then lift up the PCB.
MFC290C/250C and DCP385C/185C/165C/145C: Remove two "e" screws from the
main PCB, then lift up the PCB.
(6) Remove the main PCB shield frame.
MFC990CW/790CW/490CW and DCP585CW: Remove screw "d" from the main PCB
shield frame, then lift up the shield frame. (The screw "d" also secures the MJ/PS shield
unit.)
MFC290C/250C and DCP385C/185C/165C/145C: Remove two "c" screws and one "d"
screw from the main PCB shield frame, then lift up the shield frame. (The screw "d" also
secures the MJ/PS shield unit.)
MFC290C/250C and
DCP385C/185C/165C/145C
"e"
"e"
Main PCB
"d"
Main PCB
shield frame
Main-MJ (EXT) harness
Carriage motor harness
Main-MJ (LINE) harness
ASF motor harness
Paper feed motor harness
PF encoder/registration
sensor harness
Power supply harness
Assembling Note: If you replace the main PCB, you need to load programs onto the flash
ROM, restore the machine information that has been backed up in an external memory
(refer to Chapter 9, Section
(refer to Chapter 7, Section
mounted.
MFC990CW/790CW/490CW and DCP585CW
Main PCB
1
SDAA enclosure
*
"c"
"c"
"c"
"c"
"d"
1
*
1
*
9.1.4.13), and make specified adjustments of various settings
7.3). Make sure beforehand that the head/carriage unit is
*1 For MFC only
*2 For Bluetooth support models
"c"
Lower cover
"c": Taptite, cup B M3x10
"d": Screw, pan (s/p washer) M3x8
"e": Taptite, cup S M3x6
6-53
"c"
ASF encoder harness
Cap lift cam switch harness
Purge cam switch harness
Ink cartridge detection
sensor harness
Ink empty sensor
harness
Main PCB shield frame
(6_47)
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