Canon iPF600 series Service Manual page 134

Chapter 3
(16) Turn the printhead fixer cover forward to lock the printhead.
(17) Turn the printhead fixer lever backward unit it clicks.
(18) Close the top cover.
(19) Open the ink tank cover according to the message shown on the display.
(20) Press the stopper at the top the ink tank lock lever, and then open the ink tank lock lever upward.
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