Engine Unit And Maintenance Unit; Removing The Engine Unit - Brother MFC640CW Service Manual

5.1.15 Engine Unit and Maintenance 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
ones.

Removing the engine unit

(1) Lift the engine unit up and out of the lower cover.
NOTE: When handling the engine unit, hold it at the both ends with both hands taking care not
to touch the PF encoder disk. Do not hold it with one hand at the center, particularly at the
carriage rail section.
NOTE: Do not place the engine unit directly on a flat surface; doing so may break the PF
encoder disk and gears. Be sure to place a support pad under the engine unit as illustrated
below.
Engine unit
5.1.1). After ink draining, be sure to set protective cartridges instead of dummy
Paper ejection
roller gear
Paper feed roller gear
PF encoder disk
Lower cover
5 - 5 4
Support pad
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