Engine Unit And Purge Unit - Brother MFC4820C Service Manual

6.1.13 Engine Unit and Purge Unit

During disassembly jobs, except when removing the engine unit (including the purge unit and the
needle tube & head flat cable ASSY), leave the print head unit and all four ink cartridges in the
machine.
When removing the print head unit or engine unit, you need to remove the ink cartridges and drain
the ink from the needle tubes beforehand.
Removing the ink cartridges and draining the ink from the ink tubes
(1) Make sure that all four ink cartridges have been removed and ink in the ink tubes has been
drained. (Refer to Section 6.1.1.)
Removing the engine unit (Refer to the illustration on the next page.)
(2) Remove six screws (four "g" screws and two "h" screws) from the engine unit.
(3) Disconnect the harnesses from the carriage motor, purge motor, air pump motor, and paper
feed motor.
(4) Remove two screws "i" from each of the needle sections of the needle tube & head flat cable
ASSY.
(5) Take out each of ink tubes that are routed between the tube guides on the ink cartridge support
base.
(6) Lift the engine unit up and out of the lower cover.
NOTE: When handling the engine unit, take care not to touch the PF encoder disk.
NOTE: Pinch the end of the drain tube with a clip to prevent drained ink from leaking and the
machine from getting stained with leaked ink.
NOTE: Wrap the end of the waste ink tube with a tissue to prevent drained ink from leaking
and the machine from getting stained with leaked ink.
NOTE: The initial production set does not have the waste ink tube. And ink absorber box of
the initial production set have only one slit.
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