Brother GTX-4, Service Manual

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Improvement of print quality
(14) After cleaning the exhaust portion, is such failure cleared?
(1) Confirm the state of the exhaust port.
(2) With reference to "3-1-5-3. Exhaust cleaning", clean the exhaust portion.
(3) Refer to "(13) When performing solid printing, does non-ink ejecting occur in the process of printing?" and perform
solid printing and check the result.

If all pins can eject ink to the end -> OK

If all pins cannot eject ink to the end -> NG
* Refill insufficiency is highly possible.
=> Clean the exhaust portion once again.
(4) Repeat step (2) and (3) three times.

If all pins cannot eject ink to the end -> NG
=> "(15) After replacing the filter, is such failure cleared?"