Brother GTX pro, Instruction Manual, Page: 120 / 356

120
Basic printing procedures
(4) Close the lid, and put the white ink cartridge in position inside the printer.
<IMPORTANT>

W12 and W34 cartridges should correctly be placed at their original locations. Wrongly placed cartridges could cause the
printer malfunction.

When setting the cartridge, do not shake the cartridge with the ink pouch facing down with the aim of facilitating the winding
of the pouch. Doing so will cause wrinkles, and the proper winding of the ink pouch will not be possible.
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(5) Repeat the same process to shake the other white ink cartridge to stir up the ink.
(6) On the operation panel, press .
Then, the white ink refilling will be performed automatically.
The following screen will be displayed without white ink refilling in the case of insufficient agitation.
After performing steps (1) to (5), press again.
(7)
When you are finished replacing the white ink, press in the operation panel to print the nozzle check pattern.
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"7-2-1. Print out of the nozzle check pattern (checking on the print heads) >>P.199".