Brother GTX-4 Service Manual page 161

(10) Check the waste ink tank level and take any necessary measure for it, if any, then press
panel.
After the cleaning is completed, the Install White Ink After Cleaning function will get started.
<TIPS>

The "Install White Ink After Cleaning" operation will take approximately 15 minutes. After the procedures are completed, the
current screen will go back to the standby mode screen.
4-64
Improvement of print quality
on the operation