Canon BJC-620 - Manual (Page 65)

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z Do not remove the gray-padded material around the silver filters.
z Avoid touching the terminals, print head nozzles, and silver filters
on the print head unit.
z The print head unit contains a clear liquid preservative that is
harmless; if it leaks onto your hand, wash it off.
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z Gently place the print head unit into the compartment with the
print head nozzles down, the terminals up, and the silver filters
facing the front of the printer.
z You don’t need to press on the print head unit. When you close
the compartment cover, the print head unit becomes secure.
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Chapter 4