Brother GTX-4 Service Manual

4-21
Improvement of print quality
(1) After replacing the head circuit boards of head and color head, is such failure cleared?
(1) In the case that the power is turned on, press the power switch to turn off the power.
(2) With reference to "6-2-19. Replacement of carriage circuit board", replace the head circuit board for the white head
and color head.
(3) Print out a nozzle check pattern to check the result.
 If non-ink ejection nozzle(s) are replaced -> Main unit-side circuit boards (main circuit board, carriage circuit
board) are failed.
Non-ink ejection state
Before replacing After replacing
White head ○ ×
Color × ○
○ : Such a nozzle does not exist that does not eject any ink-jet droplets
× : Such a nozzle exists that does not eject any ink-jet droplets
=> "(2) After checking the wiring of carriage circuit board through main circuit board, is such failure
cleared?"
 If non-ink ejection nozzle(s) are not replaced -> Head or maintenance suction is failed.
Non-ink ejection state
Before replacing After replacing
White head ○ ○
Color × ×
○ : Such a nozzle does not exist that does not eject any ink-jet droplets
× : Such a nozzle exists that does not eject any ink-jet droplets
=> "(5) After cleaning the maintenance parts, is such failure cleared?"

Brother GTX-4 Specifications

General

Brand	Brother
Model	GTX-4
Category	Printer
Language	English