Canon iPF5000 series Service Manual page 175

(17) Turn the printhead fixer lever backward unit it clicks.
(18) Repeat steps (11) to (17) to install Printhead of piece second.
(19) Close the top cover.
(20) Open the ink tank cover according to the message shown on the display.
(21) Press the stopper at the top the ink tank lock lever, and then open the ink tank lock lever upward.
(22) Before unpacking the ink tank you want to install, shake it slowly 7-8 times.
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Chapter 3
3-15