Head/Carriage Unit - Brother MFC640CW Service Manual

5.1.9

Head/Carriage Unit

During disassembly jobs, except when removing the ink refill ASSY or engine unit (including the
maintenance unit), leave the head/carriage unit and all four ink cartridges in the machine.
Before removing the head/carriage unit, ink refill ASSY or engine unit, you need to replace the
current ink cartridges with dummy ones and drain ink from the ink refill ASSY and head/carriage
unit (see Section 5.1.1). After ink draining, be sure to set protective cartridges instead of dummy
ones.
NOTE: When replacing the head/carriage unit, put on a grounding wrist band and perform the job
on a static mat. Also take care not to touch the conductor sections on the flat cables.
NOTE: To replace the head/carriage unit, you need to turn the machine on and let the
head/carriage unit travel to the head replacement position as described in Section 5.1.1 (Function
code 63). Do not move the head/carriage unit by hand when the machine is turned off. However, if
the head/carriage unit fails to move in Section 5.1.1, rotate the ejection idle gear shown on the next
page counterclockwise (viewed from the left) by hand to unlock the head/carriage unit and move it
to the head replacement position.
NOTE: If you replace the head/carriage unit, also replace the ink cartridges. This is because
sufficient ink volume is necessary for refilling the ink supply tubes after replacement of the
head/carriage unit.
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