Purge Mechanism - Brother DCP6690CW Service Manual

(3) Purge mechanism

The paper feed motor drives the purge mechanism.
The counterclockwise rotation of the paper feed motor drives the purge cam that aligns the
pump switching unit with either the black or color ink drain position.
Next, the paper feed motor reverses to activate the tube pump, producing negative pressure to
drain the air and old ink from the head nozzles and channels into the ink absorber box.
Pump switching unit
Purge bevel gear
ASF changeover gear
Cap lift cam gear
Main drain tube
Purge cam
Air vent tube
Planetary arm
Tube pump
3-29
Main drain tube
Color drain tube
Black drain tube
Opening tube to
the atmospheric air
Main drain tube
(3_14)
Confidential