Canon imagePROGRAF iPF685 User Manual page 598

Ink Level Detection
7
Check the message and press the ▶ button.
8
Press ▲ or ▼ to select Yes, and then press the OK button.
9
A confirmation message about updating ink information is shown on
the Display Screen. After checking the message, press the ▶ button.
10
Press ▲ or ▼ to select Yes, and then press the OK button.
Ink level detection is now released.
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iPF685
User's Guide