Brother MFC640CW - 1 ] Maintenance Mechanism Components; 2 ] Maintenance Unit Components; Head Maintenance Mechanism; Pump Switching Unit

3-24 Confidential
3.2.2.3 Head maintenance mechanism
[ 1 ] Maintenance mechanism components
The head maintenance mechanism consists of the maintenance unit and the ink absorber box. (See
the illustration below.)
The maintenance unit has the following functions.
- Locking the head/carriage unit
- Capping the head nozzles to prevent them from drying up (See page 3-26.)
- Purging for restoring optimum head performance by removing old ink from the head nozzles (See
page 3-27.)
- Removing air bubbles from the print head (See page 3-15.)
- Cleaning with the wiper (See page 3-31.)
The ink absorber box absorbs the ink sucked out by purge operations.
Ink absorber box
(Head/carriage unit)
(Ink supply tubes)
(Ink refill ASSY)
(Ink cartridges)
Maintenance unit
[ 2 ] Maintenance unit components
- Pump switching unit
This switches the negative pressure from the tube pump and the atmosphere to the black and
color head caps, the air vent unit, etc.
- Purge cam
This rotating cam drives the carriage lock, the switching unit, the air vent rods, the head wiper,
etc.
- Head/carriage lock
This locks the head/carriage unit in its home position.