Canon BJC-620 - Manual (Page 66)

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z Press down firmly on the two white dots on the top of the cover
until it snaps securely closed.
z You actually hear two distinct clicks as the cover engages with
the compartment base.
z Make sure the sides of the gray compartment cover touch the
black base of the print head compartment.
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z Be sure to insert the tanks into the correct slots.
 0DLQWDLQLQJ WKH 3ULQWHU Chapter 4