Brother MFC990CW Service Manual page 158

Recording paper
Check that:
(1) A recommended type of recording paper is used.
(2) The recording paper is not dampened.
Ink cartridges
(1) Check that all of four ink cartridges are loaded.
Head/carriage unit
(1) Repeat the purge operation (Function code 76) several times. (Refer to Chapter 9, Section
9.1.4.27.)
(2) Clean the print surface of the head/carriage unit.
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