HP 3000dtn - Manual (Page 133)

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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.
5 Lift and push the latch toward the back of the printer (item 3 in
the graphic).
6 To remove a printhead, place your index finger in the loop of
printhead’s handle, and gently pull up until the printhead releases
from the carriage assembly.
7 Using a soft, dry, lint-free cloth, carefully remove any ink from the
contact pads on the printhead and inside the printhead slot in
the printer.
8 Reinsert the printhead into its color-coded slot. Press firmly on the
printhead to ensure proper contact.
9 Repeat steps 5 through 7 for the remaining printheads.
10 Pull the printhead 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.
11 Close the printhead cover and the ink cartridge cover.