Brother MFC5890CN Service Manual page 76

(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.
Purge cam
Pump switching unit
Main drain tube
Purge bevel gear
ASF changeover gear
Cap lift cam gear
Color drain tube
Black drain tube
Main drain tube
Air vent tube
Main drain tube
Planetary arm
(3_14)
Tube pump
Confidential
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