Engine Unit And Flushing Box - Brother MFC990CW Service Manual

6.1.16 Engine Unit and Flushing Box

During disassembly jobs, except when removing the ink refill ASSY or engine unit (including
the maintenance unit), leave the head/carriage unit in the machine.
Before removing the head/carriage unit, ink refill ASSY or engine unit, you need to replace all
four ink cartridges with the protective part (see
Assembling Note: If you replace the engine unit, make adjustments specified in
Section 7.2.
Assembling Note: When routing the cap lift cam switch harness, first check that it passes
through the cable guide on the maintenance unit and then pass it under the 3rd cable guide (on
the lower cover) counted from the rear, pulling it with your fingers as shown below.
After routing the harness, make sure that there is no slack in the harness. If slacked, the harness
interferes with the planet gear on the maintenance unit, causing MACHINE ERROR 50.
(1) If the MJ/PS shield unit has not been removed, you need to remove screw "h" shown on
page 6-54.
(2) Remove the chassis support by removing the screw.
Assembling Note: Insert the chassis support into the cutout provided in the right end of
the engine chassis as shown below.
(3) Remove the screw from the rear of the engine unit.
(4) Take the carriage motor harness, ASF motor harness, purge cam switch harness, and cap
lift cam switch harness out of the harness guides provided on the lower cover.
Carriage motor harness
ASF motor harness
Lower cover
ASF encoder harness
Cap lift cam switch harness
Purge cam switch harness
Cap lift cam
switch harness
ASF encoder
harness
Purge cam switch
harness
page 6-4).
Taptite, cup B
Chassis support
M3x12
Carriage motor
Ferrite cores
harness
ASF motor
Note: When routing the cap lift cam switch harness on
harness
the lower cover, pass it under the 3rd cable guide
counted from the rear without any slack, pulling it
with your fingers.
6-78
Chapter 7,
Cable guide
(on the maintenance unit)
Cap lift cam
switch harness
Cable guide
(on the lower cover)
(6_72_1)
Confidential