Brother MFC5490CN Service Manual page 186

(3) Disconnect the main-MJ (EXT) harness from the main PCB and release it from the cable
guides provided on the SDAA enclosure.
(4) Press the right and left ends of the SDAA enclosure inwards and remove it from the main
PCB.
(5) Disconnect the main-MJ (LINE) harness (2-wire, yellow) from the main PCB.
(6) Remove four "c" screws from the main PCB, then lift up the PCB.
(7) 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.)
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.
Main PCB
SDAA enclosure
"c"
"c"
"d"
9.4.10), and make specified adjustments of various settings
7.3). Make sure beforehand that the head/carriage unit is
"c"
"c"
Main PCB shield frame
Lower cover
6-36
ASF encoder harness
Cap lift cam switch harness
Purge cam switch harness
Ink cartridge detection
sensor harness
Ink empty sensor
harness
(6_26_BHL9_A4)
"c": Taptite, cup B M3x10
"d": Screw, pan (s/p washer) M3x8
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