Head Maintenance Mechanism; Maintenance Mechanism Components; Maintenance Unit Components - Brother MFC620CN Service Manual

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
- Purging for restoring optimum head performance by removing old ink from the head nozzles
(See page
- Removing air bubbles from the print head (See
- Cleaning with the wiper (See
The ink absorber box absorbs the ink sucked out by purge operations.
Ink absorber box
(Head/carriage 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.
3-28.)
page
page 3-16.)
3-32.)
Maintenance unit
(Ink supply tubes)
3-25
page 3-27.)
(Ink cartridges)
(Ink refill ASSY)
Confidential