3. Push down as indicated by the arrow shown below.
When installing the new printhead there may be some resistance, so you need to
press it down firmly but smoothly.
If you have difficulty, see The problem is I cannot insert a printhead.
4. Insert any other printheads that need to be installed, and close the carriage cover.
When all the printheads have been inserted correctly and accepted by the printer,
the printer will beep.
Note If the printer does not beep when you insert the printhead and the
Replace message appears on the front panel, the printhead may need to
be reseated.
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How do I handle the ink system?