Brother GTX600NB Instruction Manual page 174

How to refill white ink
(1) From the menu, select [Ink refill] and press
(2) Select [White] and press
(3) Insert the white IC stick and press
<TIPS>

An error appears if you insert an IC stick of a different color from the depleted ink.
Precautions to keep good printing quality/use printer over the long term
× Error
Ink refill： White
.
.
.
6-6
IC stick insertion slot