HP Designjet 8000s Series Installation Manual page 58

Unpacking and Installation
37 Lift up and remove ALL the Dummy Printheads (1) from the Carriage.
38 Insert the Printhead (1) into the Carriage and press firmly until the Printhead
clicks into place so that it is fully inserted into the slot.
39 Lower the Top Printhead Latch (1).
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HP Designjet 8000s Series Printer Installation Guide