Canon iPF840 - Page 633

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.
iPF840 Ink Level Detection
User's Guide
Troubleshooting Other problems
633