Brother GTX-4 Instruction Manual page 212

(8) Open the lid of the cartridge and place the ink pouch in its correct position.
<IMPORTANT>

Always open the cartridge lid and properly rewind the ink pouch. If the pouch is placed without opening the lid, ink can flow
into the wound section of the pouch when stirred, causing improper winding of the pouch.

When opening the lid, place the entire cartridge on a flat surface, push the latches on the bottom surface of the cartridge
downward and open the lid.

When setting the ink pouch, avoid unevenness or wrinkles on the pouch.

When opening the lid, be sure not to touch the portion (a). Otherwise, it could be damaged.
<NOTE>

If the remaining ink level is low, hold the sagged part of the ink pouch and close the lid.
Place the pouch in straight alignment with the cartridge
(9) 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
printer malfunction.
(10) Repeat the same process to replace the other maintenance solution cartridge with the white ink pouch.
Precautions to keep good printing quality/use printer over the long term
Cartridge
(a)
No wrinkles
Ink pouch
212
Lid
Latch
Not sagged
X0182
Lid
X0078
X0142