Canon imagePROGRAF iPF6400SE User Manual page 636

Ink Level Detection
3
A confirmation message is shown on the Display Screen about releasing
ink level detection. After checking the message, press the ▶ button.
4
After checking the message, press the ▶ button.
5
Press ▲ or ▼ to select Yes, and then press the OK button.
6
Check the message and press the ▶ button.
7
Check the message and press the ▶ button.
636
iPF6400SE
User's Guide