Canon BJC-620 - Manual (Page 63)

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Remove the print head unit only when you have a new one available (otherwise
your ink tanks may dry out). To remove the used print head unit, follow these
steps:
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z Open the printer’s cover.
z Remove the four ink tanks and set them aside for now.
{ Be sure to set them upright on a level surface with their number
labels facing up.
{ Do not remove the print head yet.
z Close the cover
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z Press and hold down the FF, PRINT MODE
and buttons and press the
POWER
button until the printer beeps. This empties the ink from the print
head unit.
z Open the printer’s cover.
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Press in on the tabs on the sides of the cover and lift it up.
 0DLQWDLQLQJ WKH 3ULQWHU Chapter 4