Back End; Back End Components And Their Main Roles; Damper Assemblies; Air Vent Unit - Brother MFC5490CN Service Manual

Back end

Damper ASSY (Magenta)
Air bubbles
Left chamber
Damper ASSY (Cyan)
Air bubbles
Left chamber
Damper ASSY (Yellow)
Air bubbles
Left chamber
Damper ASSY (Black)
Air bubbles
Left chamber

Back end components and their main roles

- Damper assemblies

Each assembly has two roles: dampening the ink pressure fluctuations* in the ink supply tube
as the carriage moves and collecting air bubbles that grow in the ink flow path.
* Ink pressure fluctuations: As the head/carriage unit travels, inertia means that the ink remains in the
same place, temporarily raising or lowering the pressure in the right chamber.

- Air vent unit

At regular scheduled intervals, this vents any air bubbles that have accumulated in the damper
assemblies. The air vent rods in the maintenance unit push up the shut-off valves, opening the
air vent flow paths.
Right
chamber
Right chamber
Right
chamber
(Air vent rods)
(A part of maintenance unit)
Right
chamber
3-15
Shut-off valves
Air vent unit
(Air vent cap)
(BackEnd_E)
Confidential