Print Head Unit - Brother MFC4820C Service Manual

6.1.2 Print Head 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. (Refer to Section 6.1.1.)
NOTE: To replace the print head unit, you need to turn the machine on and make the carriage
travel to the head replacement position with Function code 63 + * in the maintenance mode. Do not
move the carriage by hand when the machine is turned off.
NOTE: If you replace the print head unit, also replace the ink cartridges with new ones.
Removing the ink cartridges and draining the ink from the ink tubes
(1) Make sure that all four ink cartridges have been removed and that the ink in the ink tubes has
been drained. (Refer to Section 6.1.1.)
Removing the print head unit
(2) Plug the power cord into an outlet, make the machine enter the maintenance mode (Menu/Set,
*, 2864), and make the carriage travel to the head replacement position using Function code 63
+ *.
Refer to Chapter 7, Section 7.5.12 "Carriage Travel and Initial Setup Mode."
(3) Unplug the power cord from the outlet.
(4) Fully open the scanner unit.
(5) Unlatch the head cover ( below) and pull it slightly to the front and up ( ).
Head cover
Print head unit
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