Brother GTX-4, Service Manual

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4-37
Improvement of print quality
(7) After replacing the suction cap, is such failure cleared?
(1) With reference to "6-1-25. Cap rubber replacement", replace it with a new one.
(2) Print out a nozzle check pattern to check the result.

If non-ink ejection nozzle is not found -> OK

If the state of non-ink ejection nozzle is not changed -> NG
* There is a possibility of the head being failed.
=> With reference to "4-1-2. White head cleaning", perform the head cleaning. (White Head Only)
(3) Check the result of cleaning the head.

If non-ink ejection nozzle is not found -> OK

If the state of non-ink ejection nozzle is not changed -> NG
=> With reference to "6-1-31. Replacement of print head", replace the head.