Canon iPF9000 series Service Manual page 214

Chapter 3
7) Raise the ink tank lock lever and remove all ink tanks.
Put the removed ink tanks in the plastic bag with the ink supply part [1] upward and close the opening.
8) Return the ink tank lock lever and close the ink tank cover.
Ink drainage is performed automatically. Replace the maintenance cartridge when the cartridge replacement message appears.
9) When MOVE PRINTER completed message appears, turn off the power, and remove the power cord and interface cable.
10) Open the upper cover and raise the ejection guide.
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