Canon iPF5000 series Service Manual page 177

(27) Close the ink tank cover.
(28) When the printhead and all ink tanks have been installed, the message "Do Not Open Cover" appears on the display and initial ink filling requires about 14
minutes.
MEMO:
- Initial ink filling performed at printer installation consumes ink beween the ink tanks and printhead.
- "80%" may be displayed as the remaining ink level immediately after initial ink filling. This is not a failure.
F-3-60
Chapter 3
3-17