HP 3000dtn - Manual (Page 20)

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Step 4: Install the ink cartridges
1 Make sure the printer is turned on.
2 Lift the ink cartridge cover.
3 Remove each ink cartridge from its package.
4 Align the colored arrows, and then insert each ink cartridge into its
color-coded slot.
5 To ensure proper contact, press firmly on the cartridges until they
snap into place.
Note When replacing ink cartridges, install the new ink cartridges right
away. Ink cartridges should not be removed from the printer for long
periods of time.
Step 5: Install the printheads
CAUTION Before you lift the printhead cover, make sure that the printer
is plugged in and turned on. Otherwise, you cannot install
the printheads.
1 Lift the printhead cover.
2 To open the latch, lift it from the rear (item 1 in the graphic) and
then pull it forward and down to release the hook from the metal
catch (item 2 in the graphic).
CAUTION Do not attempt to force open the printhead latch. The printhead
carriage will move to the left when the printer is turned on, enabling
you to open the latch.