HP 3000dtn - Manual (Page 21)

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3 Lift and push the latch toward the back of the printer (item 3 in
the graphic).
4 Remove each printhead from its package.
5 Remove the protective tape from each printhead.
6 Remove the plastic cap from each printhead by pulling down as
indicated by the arrow on the cap.
7 Insert each printhead into its color-coded slot.
Note The color order of the printheads does not correspond with the color
order of the ink cartridges.
8 Press firmly on each printhead to ensure proper contact
after installation.
9 Pull the latch all the way forward and down, and engage the catch
with the hook (item 2 in the graphic). Push the latch towards the
back of the printer. You might have to apply some pressure to close
the latch.
10 Close the printhead cover and the ink cartridge cover.
11 Wait while the printer aligns the printheads. This can take about 20
minutes. When the process is complete, an alignment page prints.
If no alignment page prints, check to make sure there is media in
the trays.
Step 6: Install the printer software and connect
the interface cable
You can install the printer software for local printing or network printing.
For local printing, you can connect the printer using a USB cable or a
parallel cable.
For more information about using USB or parallel interface
connections with your computer, see the documentation that came
with your computer.