Brother MFC640CW - Page 70

3-32 Confidential
(5) Removing air
Another position of the purge cam shifts the slide cams, producing vertical motion of the air vent
rods. Pushing up the air vent rods opens the shut-off valves inside the air vent unit of the
head/carriage unit. Simultaneously adding negative pressure from the tube pump expels air trapped
in the manifolds.
Maintenance unit
Clutch gear
Purge gear
Slide cam for black ink
Purge cam
Slide cam for color ink
Air vent unit
Air vent rod